Supported authentication
methodsThis technical integration describes how to integrate Citrix NetScaler and Identity as a Service. Once integrated, access to the server will require Identity as a Service authentication. The NetScaler details, such as the IP address, name, configuration secret, and ports can be added or modified during the VPN server configuration.
Before you begin, review the following:
Supported authentication
methods| Authentication method | Notes | Supported protocols |
Password |
Password authentication is first-factor authentication with Identity as a Service password feature. |
PAP, CHAP, MS-CHAP |
RADIUS |
RADIUS authentication is first-factor authentication with a RADIUS server. |
PAP, CHAP, MS-CHAP |
External |
External authentication is first-factor authentication with an LDAP-compliant directory or a Windows domain controller through Kerberos. |
PAP |
Grid* |
Two-step authentication only. |
PAP, CHAP, MS-CHAP |
Token |
Hardware/software Mobile Soft Token (supports response-only tokens for second-factor authentication) |
PAP Entrust tokens also support CHAP and MS-CHAP |
Temporary Access Code |
|
PAP, CHAP, MS-CHAP |
One-time password |
Two-step authentication only |
PAP, CHAP, MS-CHAP |
Knowledge-based questions and answers |
The RADIUS proxy only supports a single question and answer. For CHAP and MS-CHAP, the answer must be an exact match. Two-step authentication only. |
PAP, CHAP, MS-CHAP |
Note: The PA-VM supports only CHAP authentication methods with RADIUS.
PrerequisitesComplete the following steps before integrating your authentication system with Identity as a Service:
1. Install and configure your first-factor authentication resource using the documentation provided by the vendor. The first-factor authentication resource can be a RADIUS server or an external authentication resource (a Local DB, LDAP-compliant directory or Windows domain controller through Kerberos).
2. Install and configure the RADIUS appliance using the documentation provided by the vendor. The device must be able to route traffic before integrating with Identity as a Service.
3. Install and configure Identity as a Service and an Identity as a Service Gateway (containing a RADIUS proxy agent). Take note of the shared secrets, IP addresses, and ports you use. You need this information to configure the RADIUS appliance and first-factor authentication resource.
4. If you want to configure your RADIUS appliance and first-factor authentication resource to recognize Identity as a Service user groups, you must define the Identity as a Service user groups first.
Complete the following procedures to integrate Citrix NetScaler with IDaaS.
Step 1: Configure the Citrix Netscaler server
Configure
CITRIX Netscaler server 12.0
1. Log into the Citrix NetScaler Configuration utility.
2. Expand the NetScaler Gateway option on the left-hand menu.
Note: You can configure the authentication, policy, and virtual servers manually or you can use the Access Gateway Wizard. The wizard is much easier and configures the authentication on a global level.
3. Select the NetScaler Gateway Wizard. The NetScaler Gateway Wizard appears.
4. Click Get Started to continue. The NetScaler Gateway Settings page appears.
5. Do one of the following:
● If you are creating a New Virtual Server, enter the IP address, port, and virtual server name for the new virtual server.
● If you are modifying an existing virtual server, select existing and then choose the virtual server to modify.
6. Click Continue. The Server Certificate page appears.
Note: The Virtual Server for the Access Gateway needs to have a certificate installed, or the Virtual Server interface is disabled. There are several options for creating and selecting the Virtual Server certificate. In a production environment you would most likely install a certificate from a trusted Certificate Authority using a certificate signing request. To get the system up and running quickly you can simply use a test certificate issued by the device itself.
7. In the Server Certificate page, do the following:
a. The Server Certificate section, select Create Test Certificate.
b. In the Certificate FQDN box, enter a domain name that users will enter into the browser.
8. Click Continue. The Authentication Settings appear.
9. In the Authentication Settings page, you can configure Primary and secondary authentication.
10. Under Primary authentication method, you can select Local users or Active Directory/LDAP. For this guide we use Active Directory/LDAP.
11. For the Primary authentication set the following:
a. Enter the IP Address of the Active Directory/LDAP server.
b. Enter the Port that Active Directory/LDAP server is listening to for requests (default 389).
c. Enter the Base DN under which users are located.
Example: CN=Users,DC=example,DC=com).
d. Enter a valid Password to log onto Active Directory/LDAP server.
e. Enter the value you entered in the Password field into the Confirm Password field.
f. Accept the Time out default value.
g. In the Server Logon Name Attribute enter SAMAccountName.
12. To set the Secondary authentication method, do the following:
a. Select RADIUS from the secondary authentication drop-down list.
b. Enter the IP Address of the RADIUS server.
c. Enter the Port that RADIUS server is listening (default 1812).
d. Set the Time out to 50.
e. Enter the Secret Key (shared secret).
f. Confirm the Secret Key.
Note: You need to increase the Time out value if you are using TVS (Mobile ST) authentication. This can also be confirmed by tracking how long a request waits before it times out.
13. Click Continue. The NetScaler Gateway Wizard page appears.
14. Review the settings and click Done to complete the configuration.
15. Verify that the setup is working:
a. Expand the NetScaler Gateway option on the left-hand menu. Select the Virtual Servers options. The NetScaler Gateway Virtual Servers page appears.
b. On the Virtual Server page and ensure that the state is UP.
Configure
CITRIX Netscaler 12.1/13.0 service
1. Log into the Citrix NetScaler Configuration utility.
2. Expand the Citrix Gateway option on the left-hand menu.
Note: You can configure the authentication, policy, and virtual servers manually or you can use the Access Gateway Wizard. The wizard is much easier and configures the authentication on a global level.
3. Select the Citrix Gateway Wizard. The Citrix Gateway Wizard appears.
4. Click Get Started to continue. The Citrix Gateway Settings page appears.
5. Do one of the following:
● If you are creating a New Virtual Server, enter the IP address, port, and virtual server name for the new virtual server.
● If you are modifying an existing virtual server, select existing and then choose the virtual server to modify.
6. Click Continue. The Server Certificate page appears.
Note: The Virtual Server for the Access Gateway needs to have a certificate installed, or the Virtual Server interface is disabled. There are several options for creating and selecting the Virtual Server certificate. In a production environment you would most likely install a certificate from a trusted Certificate Authority using a certificate signing request. To get the system up and running quickly you can simply use a test certificate issued by the device itself.
7. In the Server Certificate page, do the following:
a. Under Server Certificate, select Use existing certificate.
b. Select the Server Certificate from the drop-down list.
8. Click Continue. The Authentication Settings appear.
9. In the Authentication Settings page, you can configure Primary and secondary authentication.
10. Under Primary authentication method, you can select Local users or Active Directory/LDAP. For this guide we use Active Directory/LDAP.
11. For the Primary authentication set the following:
a. Enter the IP Address of the Active Directory/LDAP server.
b. Enter the Port that Active Directory/LDAP server is listening to for requests (default 389).
c. Select the Security Type from the drop-down list.
d. Enter the Base DN under which users are located.
Example: CN=Users,DC=example,DC=com).
e. Enter a valid Service Account used to query LDAP.
f. Enter a valid Password to log onto Active Directory/LDAP server.
g. Enter the value you entered in the Password field into the Confirm Password field.
h. Accept the Time out default value.
i. In the Server Logon Name Attribute enter SAMAccountName.
12. To set the Secondary authentication method, do the following:
a. Select RADIUS from the secondary authentication drop-down list.
b. Enter the IP Address of the RADIUS server.
c. Enter the Port that RADIUS server is listening (default 1812).
d. Set the Time out to 50.
e. Enter the Secret Key (shared secret).
f. Confirm the Secret Key.
Note: You need to increase the Time out value if you are using TVS (Mobile ST) authentication. This can also be confirmed by tracking how long a request waits before it times out.
13. Click Continue. The Citrix Gateway Settings page appears.
14. Review the settings and click Done to complete the configuration.
15. Verify that the setup is working:
a. Expand the Citrix Gateway option on the left-hand menu. Select the Virtual Servers options. The Citrix Gateway Virtual Servers page appears.
b. On the Virtual Server page and ensure that the state is UP.
Step
2: Add CITRIX Netscaler to Identity as a Service
Note: Entrust recommends that when multiple RADIUS applications are configured that each RADIUS application is given a unique shared secret.
Integrate a RADIUS client
1. Click
> Security > Applications. The Applications
page appears.
2. Click Add. The Select an Application Template page appears.
3. Under RADIUS and VPN Integrations, click Citrix Netscaler. The Add Citrix Netscaler page appears.
4. Optional: Edit the Application Name.
5. Optional. Enter a Description for your application.
6. Optional. Add a custom application logo as follows:
a. Click 
next
to Application Logo. The Upload
Logo dialog box appears.
b. Click 
to select an image file to upload.
c. Browse to select your file and click Open. The Upload Logo dialog box displays your selected image.
d. If required, resize your image.
e. Click OK.
7. Click Next. The Setup page appears.
8. Click Add to next to Hosts to add the host name of the VPN server. The RADIUS agent receives the request on this host. The RADIUS Agent on the Gateway determines the RADIUS application the request is for based on the host name and port.
9. Enter the host name in the Host dialog box and then click OK. Repeat this step to add more host names.
10. In the Port field, enter the port on which the RADIUS agent accepts messages.
Tip: Do not enter 8443 as the port number for this application. Port 8443 is used by the Entrust Identity Enterprise agent in your Gateway.
Attention: The RADIUS agent
uses the host name that sent a request and the port number that it
received the request from to determine which RADIUS application made
the request. Because of that:
–Two RADIUS applications with the same port value cannot share any
host names.
–Two RADIUS applications that have one or more matching host names
must have different port values.
11. In the Shared Secret field, enter the shared secret that is used by your VPN server. This is the RADIUS secret shared between your VPN server and the RADIUS server. The shared secret value must match a shared secret in your RADIUS client.
12. From the Select RADIUS Agent drop-down list, select the name of the Gateway containing the RADIUS agent to which this application will be assigned.
13. Optional: From the Select RADIUS Attribute for IP Address drop-down list, select the RADIUS attribute that corresponds to your IP location.
14. In the Challenge Response Queue Max Time field, set the number of seconds that the RADIUS agent waits for a response to first-factor authentication. The default value is 180 seconds.
15. In the Challenge Response Queue Max Size field, set the maximum number of second-factor challenge requests allowed in the queue of your RADIUS application. The default value is 1000 requests. The maximum value is 10,000.
16. In the Request Cache Timeout field, set the number of seconds to cache requests. The default value is 10 seconds.
17. From the Character Set drop-down list, select the character set used to decode and encode string values (including the user ID and password values) in RADIUS messages. The options are UTF-8 and ISO-8859-1.
18. Optional: Select Log RADIUS messages to enable RADIUS message logging. When enabled, messages for the RADIUS agent are logged to the same log file as the gateway logs.
19. Optional:
Enable the Authentication Settings.
Select Enable Push Authentication Fallback if you want to authentication to fallback to another authenticator in the event of a failure. If required, set the Push Authentication Fallback Timeout to the number of minutes before the push authentication times out.
Select When authenticating the user will be asked to select their second-factor authenticator. When selected, after the user responds to the first-factor challenge, they are prompted to select their second-factor authenticator. The list of available second-factor authenticators is set by the resource rule.
The following is a list of supported strings matched to the authentication types:
Grid: grid
Knowledge-based Authentication: kba
One-time password: email, sms, voice
Smart Credential Push: scpush
Temporary Access Code: tac
Token: token
Token push: push
Select Indicate if requests must include the message-authenticator attribute for incoming messages to include the message-authenticator attribute for incoming messages.
Select Indicate if requests must include the message-authenticator attribute for outgoing messages to include the message-authenticator attribute for outgoing messages.
Select Remove domain from user ID for incoming requests to remove the domain value from the user ID during authentication when the user ID provided by the RADIUS client is in the format domain\username and the user ID in IDaaS is in the format username.
Select Indicate if Active Directory password authentication requests are handled by the same Gateway Instance that initiated the request to require that Active Directory password authentication and change requests that are initiated as part of the RADIUS authentication are handled by any Gateway Instance in the same Gateway cluster that initiated it. If disabled, the request is handled by any Gateway Instance.
Select Enable one-step multi-factor authentication. When enabled, the user enters their user ID and then their password and token response in the password field. If you select this option, second factor authenticators available in the resource rule are limited to token and temporary access code.
Enter the One-step multi-factor authentication security token length. This is the length of the token or temporary access code response if you enable one-step multi-factor authentication.
20. Optional.
Add Response Attributes. Response attributes are
returned to the RADIUS application after successful authentication.
Use this setting to configure RADIUS attributes to return information
such as the user's group information to the VPN server.
When adding response attributes, you optionally add group filters. For example:
Example:
Users in IDaaS may belong to one of the following groups CANADA,
US, UK, FRANCE.
The VPN server wants the FilterID attribute returned from the IDaaS
RADIUS agent to be the value NA or EUROPE, depending on whether
the user is in NA (Canada, US) or Europe (UK, France).
To do this, use a RADIUS attribute filter for the FilterID attribute
with a Groups value with the following filters:
- match CANADA, replace NA
- match US, replace NA
- match UK, replace EUROPE
- match FRANCE, replace EUROPE
Set the Response Attributes as follows:
Click
Add. The Add
a Response Attribute
dialog box appears.
Select the RADIUS Attribute ID from the drop-down list. The option you select depends on your VPN vendor.
Select the Value Type from the drop-down list.
To return a static value specific in the RADIUS attribute definition, select Static and enter a Value in the field and then click Add.
To return the user’s group membership, select Group and then optionally do the following:
Click Add to add filters.
Enter the Match and the Replace attribute filters.
Click Add to add more attribute filters.
If you add multiple filters, you can drag and drop them in order of preference.
Select Stop after matching filter if you only want one the filter to return one value. Using the example above, if you want NA to have preference over Europe, make sure to list Canada and US in the list of filters.
Multiple Values Per Attribute, enter the Value Separator and then click Add.
Note: If a user belongs to more
than one group, you can either add a separate attribute to your
RADIUS response for each group or you can combine all of the groups
into a single attribute. For example, if the user belongs to G1,G2,G3
then you would
- return a RADIUS response with three attributes
OR
- return a RADIUS response with one attribute and a value like
“G1,G2,G3” where the , is defined in the Value Separator setting
or a value like “G1 G2 G3” where the Value Separator is defined
as a space.
Attention: The default group separator is a space. If you have group names that are separated by a space, use another separator, such as a comma.
Repeat these steps to add more response attributes.
21. Optional: Configure the EAP Settings to set up the application to use the EAP RADIUS authentication protocol.
a. Select EAP Enabled to allow the RADIUS application to accept EAP messages.
– When enabled, authentication messages with EAP content are treated as EAP requests. The application can accept only EAP authentication requests.
– When disabled, incoming authentication requests are processed by the RADIUS application as a standard RADIUS authentication request (even if the request includes EAP content). In this case, the application can accept only standard RADIUS authentication requests.
b. Select the EAP Protocol from the drop-down list. The options are PEAPv0 with MS-CHAPv2 and PEAPv1 with GTC.
This setting defines the type of EAP authentication protocol that is performed on EAP requests received by the RADIUS application. Consult the configuration requirements of your VPN server to determine which EAP protocol to select.
c. Select Return MPPE Keys to include the MPPE (Microsoft Point-to-Point Encryption) recv and mppe send keys in the Access-Accept message returned during a successful EAP authentication. The setting is enabled by default.
d. Select Use PEAPv1 label when calculating MPPE Keys to use the PEAPv1 label when calculating the mmpe recv and mppe send keys.
e. Leave the Minimum TLS Version, Maximum TLS Version and Allow Weak Ciphers at the default settings unless you have an older VPN and need to configure these settings to allow older versions of TLS or weaker ciphers to interoperate with older VPN servers that do not support the latest versions.
22. Configure the Deprecated Settings if your RADIUS application is connected to a Gateway version older than 3.0. These values are only required for backwards compatibility.
a. Select Token OTP Only, Password with second-factor, or No first-factor as the Authentication Type. This setting defines the level of authentication required to access a RADIUS application that relies on a gateway RADIUS agent configured before release 3.1.
Note: MSCHAPv2 authentication is not supported when No first-factor authentication is configured for the RADIUS application.
23. Click Submit.
Step 3: Protect
CITRIX Netscaler with a resource rule● Resource rules for RADIUS applications only include the Date / Time, Geolocation and Source IP Address condition restriction.
● The Authentication Decision steps that you can select for a RADIUS application resource rule depend on whether the RADIUS application uses EAP RADIUS authentication.
● If the settings of a RADIUS application on Identity as a Service are modified so that the application uses EAP RADIUS authentication, or the type of EAP protocol used is changed, the resource rule associated with the RADIUS application is automatically updated.
● RADIUS applications with no EAP support the following second-factor authenticators: knowledge-based authentication, temporary access code, one-time password, grid, hardware/software token, token push, and smart credential push.
● RADIUS applications with RADIUS MSCHAPv2 support only temporary access code and hardware/software token second-factor authenticators.
● When creating a resource rule for a RADIUS application, you can select EXTERNAL+no second-factor.
● RADIUS applications with RADIUS GTC support the following second-factor authenticators: software/hardware token, one time password, grid, temporary access code, knowledge-based authentication.
Create a resource rule to protect access to a RADIUS application
1. Log in to your Identity as a Service administrator account.
2. Click
> Security
> Resource Rules. The Resource Rules List
page appears.
3. Click + next to the application you want to protect with a resource rule. The Add Resource Rules page appears.
4. Enter a Rule Name and Rule Description for the resource rule.
5. In the Groups list, select the group or groups of users restricted by the resource rule.
These are the groups to which the resource rule applies. If you do not select any groups, by default the resource rule applies to all groups.
Attention: You must maintain the default of all groups if you want to allow external authentication and bypass second-factor authentication for users who do not already exist in Identity as a Service. External Authentication without second-factor is only available to low risk users of RADIUS applications that support External Authentication.
6. Click Next. The Authentication Conditions Settings page appears.
7. If you do not Enable Advanced Risk Factors, do the following:
a. Select the Authentication Flow from the drop-down list. The Authentication Flow flowchart updates based on the selection.
b. Click Submit to save the Resource Rule.
8. If you want to Enable Advanced Risk Factors, complete the remaining steps in this procedure.
9. Select Enable Advanced Risk Factors to add additional risk factors to the resource rule.
10. Select Enable Strict Access for Application to set the resource rule to deny access regardless of the outcome from other resource rules. If this option is disabled for any resource rule that denies access, the user is allowed access if at least one resource rule allows access.
11. For each Advanced Risk Factor, click the Deny option to deny access to the application if the risk factor fails regardless of the results of the other risk factors.
12. Click Date/Time to set the conditions as follows:
a. Select one of the following:
– Allow Date/Time to set when a user can access the application.
– Deny Date/Time to set when the user cannot access the application.
The Date/Time Context Condition Settings appear.
b. Select the Condition Type:
– Specific Date Range Condition—Allows or denies access to the application during a select period of days.
– Time-of-day and/or Day of Week Recurring Conditions—Allows or denies access to the application on a specific time of day, day of the week, or both. Recurring times selected only apply to days not denied.
– Clear Selection—Clears existing Date and Time conditions.
c. Set the Condition Type settings, as follows:
i) Select Use local time zone to use the local time zone or deselect Use local time zone to use the local time zone and begin typing the time zone in the Begin Typing Timezone name field and select the time zone from the drop-down list.
ii) If you selected Specific Date Range Condition, click Start Date to select a start date from the pop-up calendar. Optionally, select the End Date.
iii) If you selected Time-of-Day and/or Day-of-Week, click Start Time and select the start time from the pop-up clock. Optionally set the End Time. You must also select the days of the week for the condition.
d. Click Save to return to the Authentication Conditions Settings page.
13. Click Geolocation to set the Location Condition Settings, as follows:
a. Select Allow or Deny to create an allowed or denied country list.
b. From the Selected Countries drop-down list, select the countries to add or deny access to the application. Repeat until you have added all the desired countries to the list.
c. Select Allow Anonymous IP Address to increase the risk of users authenticating from an anonymous IP.
d. Click Save to save to return to the Authentication Conditions Settings page.
14. Click Source IP Address. The IP Address Risk Setting dialog box appears. Do one of the following:
a. Select Custom and add the required IP Allowed Addresses and IP Denied Addresses.
b. Select IP List Address and select the IP List to allow or deny.
c. Select None to not restrict any IP addresses.
d. Click OK to return to the Authentication Conditions Settings.
15. Define the Location History / Known Locations and Travel Velocity conditions.
The Risk-Based Authentication (RBA) settings of your Identity as a Service account define the location history and travel velocity conditions. See Manage risk-based authentication settings for more information.
16. Set the risk score for application conditions to set the risk percentage a user receives if they fail to meet the condition, as follows:
● Click the dot next to the condition setting and slide the risk scale to the risk percentage
-or-
● Click the 0% and enter the risk points and then click OK.
The default setting is 0%. The Risk percentage determines the authentication requirements as set by the Authentication Decision. When a user attempts to authenticate to an application, the final risk percentage is the sum of all failed conditions.
17. Set the Authentication Decision risk level for Medium Risk and High Risk as follows:
a. Click the risk threshold percentage to the right of Medium Risk or High Risk. The Risk Threshold dialog box appears.
b. Enter the risk percentage.
c. Click OK.
18. Select the Authentication Flows for Low Risk, Medium Risk, and High Risk from the drop-down lists. The Authentication Flows flowchart updates based on your selections.
19. Click Submit to create the resource rule.
Step 4: Test
the integrationTest the configuration using two-factor authentication
1. Open a Web browser and enter the https URL of the newly configured virtual server, for example https://192.0.2.0, or connect using the Secure Access Client.
2. Enter the User name and Password of an Identity as a Service user and click Log On. You are prompted to enter additional information.
3. If using two-step authentication you should be presented with a challenge page. Enter the response to complete the authentication and then click Submit.
● Click
here for steps to complete a KBA challenge
You are prompted to enter answers to the questions registered in your Identity as a Service account.
Enter the answer to each question listed.
Tip: The answer to each question was recorded when the knowledge-based authenticator (KBA) was assigned to you on your Authenticators page.
Click Login.
● Click
here for steps to complete a Entrust Identity Push authentication
challenge
You are prompted to provide an authentication token to log in. Your Entrust Identity app receives a push notification requesting confirmation.
a. Open your Entrust Identity app on a mobile device.
b. Unlock (log in) using the identity you want to use to respond to the request.
c. Tap Actions.
d. Review the transaction summary details.
e. Tap Confirm.
Step 5: Hide or modify the sign-in page for users when they log in
Hide
or modify the sign-in page on Netscaler server 12.0
Hide or modify the sign-in page
1. Log in to the Citrix NetScaler server.
2. Go to System > Settings > Configure Basic Features. The Configure Basic Features page appears.
3. Select Rewrite.
4. Click OK.
5. Go to AppExpert > Rewrite > Action > Add. The Create Rewrite Action page appears.
6. Enter the following values in the information fields described below.
a. Name: Enter any name for the rewrite action.
b. Type: INSERT_HTTP_HEADER
c. Header Name: Set-Cookie
d. Expression: ("pwcount=”+ 1")
e. Click OK.
Note: Set the apostrophe in the expression as shown in the image above.
7. Go to AppExpert > Rewrite > Policies > Add.
8. Enter the following values:
a. Name: Enter any name for the rewrite action.
b. Action: Select the Rewrite Action, for example, Action_pwd_hid.
c. Undefined-Result Action: -Global-undefined-result-action-
d. Expression: HTTP.REQ.HEADER”Cookie”).CONTAINS(“pwdcount”).NOT
e. Click Create.
Note: Use the Expression Editor to create the above expression.
9. Go to NetScaler Gateway > Virtual Servers > Edit the added Virtual server > Add Policies to bind the above rewrite policy.
10. Select Rewrite as the Choose Policy.
11. Select Request as the Choose Type.
12. Click Continue. The Rewrite Policies page appears.
13. Under Select, choose Rewrite from the drop-down list.
Hide
or modify the sign-in page on Netscaler server 12.1/13/0
Hide or modify the sign-in page
1. Log in to the Citrix NetScaler server.
2. Go to System > Settings > Configure Basic Features. The Configure Basic Features page appears.
3. Select Rewrite.
4. Click OK.
5. Go to AppExpert > Rewrite > Action > Add. The Create Rewrite Action page appears.
6. Enter the following values in the information fields described below.
a. Name: Enter any name for the rewrite action.
b. Type: INSERT_BEFORE_ALL
c. Expression to choose target location: HTTP.RES.BODY(25000)
d. Expression to insert with: "//"
e. Search: Text: from.append(field_pass2)
7. Go to AppExpert > Rewrite > Policies > Add.
8. Enter the following values:
a. Name: Enter any name for the rewrite action.
b. Action: Add the step 3 rewrite action.
c. Undefined-Result Action: -Global-undefined-result-action-
d. Expression: HTTP.REQ.URL.CONTAINS(“gateway_login_form_view.js”)
Note: Use the Expression Editor to create the Expression on step d.
9. Go to NetScaler Gateway > Virtual Servers > Edit the added Virtual server > Add Policies to bind the above rewrite policy.
10. Select Rewrite as the Choose Policy.
11. Select Response as the Choose Type.
12. Click Select Policy. The Rewrite Policy page appears.
13. Under Select the Rewrite policy.