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For basic ICA Proxy connectivity to XenApp/XenDesktop, you don't need to install any NetScaler Gateway Universal licenses on the NetScaler. The STA is a part of the Citrix XML Service (once again linking to this excellent post!), which is installed as part of the Delivery Controller. I have two Citrix Gateways that are using DC's as STA servers. They also have the other environment DC's in the list too. Every time I try. DELL CITRIX OUTSIDE

A : Special care needs to be taken when load balancing Secure Ticket Authorities. When configuring the address of each STA in the gateway service configuration tool, each STA address must be the true address of the STA server — do not enter the address of any hardware load balancer, cluster name, or round-robin DNS name here.

StoreFront, Web Interface 2. When this option is enabled, no additional load balancing software or hardware is required. Application enumeration servers can use any form of load balancing for issuing a ticket request because each ticket received contains a field indicating the unique ID of the STA that generated it.

The STA is not restricted to any particular domain, farm, or application enumeration server. It is an anonymous XML service. You can also change the log file directory when you edit CtxSta. You can contact the STA in this manner from the console of your Secure Gateway server and also from any application enumeration server configured to use the gateway. If you receive an authentication dialog box prompting you for a password, the STA is not published anonymously and authentication requirements need to be removed.

To verify that the application enumeration server is successfully requesting STA tickets, look at the ICA files it generates. For example, from Web Interface 2. Open launch. For normal Secure Gateway operation, the Address parameter will contain a ticket instead of an actual XenApp server address. Remember that a ticket request is generated by an application enumeration server like Web Interface, and a data request is performed by the Secure Gateway service.

If the log file shows several ticket requests but no data requests, this implies that the application enumeration server can reach the STA but the Secure Gateway server cannot. It can also imply that users cannot reach the gateway server. During normal operation, the session sharing feature of the ICA Client can cause tickets to be requested from the STA but never claimed by the gateway.

Consider the following scenario:. Here we see what appears to be an attacker trying various tickets one at a time, incrementing the ticket ID with each attempt. In each case, the connection was rejected and the STA logged an entry indicating that the client presented a ticket that was not recognized as valid. To identify the IP address of the attacker, look for the following message in the event viewer on the Secure Gateway server:.

The Auto Client Reconnect feature does not work for Citrix Secure Gateway users because during each reconnection attempt, the client resubmits the used STA ticket with which it originally connected. Client reconnection attempts are characterized by the attempted reuse of a previously successful ticket:.

The correct way to reconnect to a disconnected session when using Secure Gateway is to return to the application enumeration server and click the application icon again. Failed to load featured products content, Please try again. Customers who viewed this article also viewed.

Log in to Verify Download Permissions. Throughout this article, the following types of servers are grouped into a single category called application enumeration servers: Web Interface 2. In Version 1. To mitigate this risk: Always use HTTPS between the client and the application enumeration server to prevent an attacker from intercepting the ticket as it travels from server to client.

Reduce the ticket time-to-live as much as possible to reduce the amount of time an attacker would have to transfer the ticket from Machine A to Machine B. A : During normal operation, a ticket must travel the following four segments of the network: From the STA to the application enumeration server From the application enumeration server to the client From the client to the Secure Gateway server From the gateway to the STA The first and last segments exist only between servers in your DMZ and the STA on your trusted network, meaning that an intruder would need to have access to your network to intercept the ticket along those lines.

To secure the second segment, put a certificate on your application enumeration Web server and allow clients to connect only if they use HTTPS. The third segment is always secured with SSL. To meet the requirements of the third bullet item, the CA root certificate needs to be installed on the Secure Gateway server and on the application enumeration server.

Take care when installing the root certificate: You cannot simply double-click a root certificate file and run the certificate import wizard. When asked which certificates to manage, select Computer account and then Local Computer. Browse to select your CA root certificate and complete the import wizard. Open Internet Services Manager. Right-click Default Web site and view the Properties. On the Web site tab, change the TCP port number from 80 to Click OK. The preceding change also affects any other resources you published from the STA Web server.

The following is an example of how you would create a new Web site on port 81 for the STA. View the properties of your new web site and change the TCP port to For Secure Gateway Version 1. Consider the following scenario: A user logs on to Web Interface and clicks the Outlook icon.

The user connects through Secure Gateway and presents the ticket for admission. The gateway validates the ticket and allows the user to connect to a XenApp Server hosting Outlook. After working for a few minutes, the user returns to the application list on the Web Interface page and clicks the Excel icon. Before connecting to a new server for Excel, the ICA Client first checks to see if any existing servers to which the client is already connected have the Excel published application available.

The second ticket requested by Web Interface is never used because a second ICA session was not necessary. By default, the ticket times out after seconds. Logging is enabled in CtxSta. Was this page helpful? Thank you! Sorry to hear that. Name Name is required. Email Email address is required. This ticket is what is sent over to Citrix Receiver or Browser in the ICA file, using which it can contact the NetScaler gateway and the NetScaler gateway can validate this and initiate a connection with the VDA on the host on behalf of the user.

So, as we can see the STA only comes into play in case of remote access. It is important to keep in mind that there are thus TWO places where the STA details are input, and that the details in both places must be the same. And the StoreFront uses its configured details to validate that ticket with an STA and identify what resources it should connect to. If the two details are not identical then you will not be able to launch any resources! I had this problem at work today which is why I decided to refresh my knowledge about STAs and thought of writing this blog post.

Just as an aside to myself — the port used to talk to the VDA is or I like to remember port numbers.

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NetScaler ADC monitors server health and allocates network and application traffic to additional servers for efficient use of resources. NetScaler Unified Gateway offers secure remote access of virtual desktops and a variety applications from a single point of entry and with single sign-on SSO. With this free download, you easily and securely get instant access to all applications, desktops and data from any device, including smartphones, tablets, PCs and Macs.

While you can still download older versions of Citrix Receiver , new features and enhancements will be released for Citrix Workspace app. With the change to open source , Citrix XenServer is now available for free to everyone on the new XenServer. Citrix Receiver is used primarily for connecting users to XenDesktop and XenApp desktops and applications, but it can also be used to deliver apps via Microsoft App-V, links to websites and individual documents, among other things.

Citrix Workspace app is a new client from Citrix that works similar to Citrix Receiver and is fully backward-compatible with your organization's Citrix infrastructure. Citrix Workspace app provides the full capabilities of Citrix Receiver , as well as new capabilities based on your organization's Citrix deployment.

What is STA in Citrix? Category: technology and computing web conferencing. It is used to control access for a Citrix Secure Gateway server. What is Citrix how it works? Is Citrix Receiver safe? Is Citrix an operating system? What is meant by Citrix? Who uses Citrix? What is difference between Citrix and VMware?

How do I setup a Citrix server? How do I access my Citrix gateway? What is the NetScaler Gateway? Is Citrix Receiver free? What is Citrix Receiver latest version? Release Date: Jun 4, Is Citrix Receiver open source?

Who owns Citrix Receiver? Why do we use Citrix Receiver? What is the difference between Citrix workspace and Citrix Receiver? What types of products are formed when acids react with metals carbonates and bases? Otherwise, the STA maintains all outstanding tickets tickets that were requested by an application enumeration server but not yet validated by a Secure Gateway using an in-memory database.

A : During normal operation, a ticket must travel the following four segments of the network:. The first and last segments exist only between servers in your DMZ and the STA on your trusted network, meaning that an intruder would need to have access to your network to intercept the ticket along those lines.

In Citrix Secure Gateway 1. Even when all of the preceding links are secured with SSL, clients are still vulnerable to attack by Trojan programs that monitor client activity. To mitigate this risk, advise your users to connect from machines where anti-virus and Trojan detection software is installed.

For more information, see the IIS documentation. Doing so indicates that your user account, not the server or any system services, trusts the CA. To install a root certificate for use with Citrix Secure Gateway or Web Interface, follow the steps:.

For example, in Web Interface 2. The following example illustrates how to change the IIS port from 80 to A : An attacker would have to guess a valid ticket and also redeem it within the few milliseconds after the client requests it but before the gateway claims it. A : Users also need domain credentials or a XenApp Server ticket that is requested by the application enumeration server.

Satisfying the STA opens a path only to the trusted network for a particular server. Once there, the user must still authenticate with valid domain credentials. A : The STA is accessed only when a user launches an application, the answer to this question varies from one deployment to the next.

A : Special care needs to be taken when load balancing Secure Ticket Authorities. When configuring the address of each STA in the gateway service configuration tool, each STA address must be the true address of the STA server — do not enter the address of any hardware load balancer, cluster name, or round-robin DNS name here. StoreFront, Web Interface 2.

When this option is enabled, no additional load balancing software or hardware is required. Application enumeration servers can use any form of load balancing for issuing a ticket request because each ticket received contains a field indicating the unique ID of the STA that generated it. The STA is not restricted to any particular domain, farm, or application enumeration server.

It is an anonymous XML service. You can also change the log file directory when you edit CtxSta. You can contact the STA in this manner from the console of your Secure Gateway server and also from any application enumeration server configured to use the gateway.

If you receive an authentication dialog box prompting you for a password, the STA is not published anonymously and authentication requirements need to be removed. To verify that the application enumeration server is successfully requesting STA tickets, look at the ICA files it generates. For example, from Web Interface 2. Open launch. For normal Secure Gateway operation, the Address parameter will contain a ticket instead of an actual XenApp server address.

Remember that a ticket request is generated by an application enumeration server like Web Interface, and a data request is performed by the Secure Gateway service. If the log file shows several ticket requests but no data requests, this implies that the application enumeration server can reach the STA but the Secure Gateway server cannot. It can also imply that users cannot reach the gateway server. During normal operation, the session sharing feature of the ICA Client can cause tickets to be requested from the STA but never claimed by the gateway.

Consider the following scenario:. Here we see what appears to be an attacker trying various tickets one at a time, incrementing the ticket ID with each attempt. In each case, the connection was rejected and the STA logged an entry indicating that the client presented a ticket that was not recognized as valid.

To identify the IP address of the attacker, look for the following message in the event viewer on the Secure Gateway server:. The Auto Client Reconnect feature does not work for Citrix Secure Gateway users because during each reconnection attempt, the client resubmits the used STA ticket with which it originally connected. Client reconnection attempts are characterized by the attempted reuse of a previously successful ticket:.

The correct way to reconnect to a disconnected session when using Secure Gateway is to return to the application enumeration server and click the application icon again. Failed to load featured products content, Please try again. Customers who viewed this article also viewed. Log in to Verify Download Permissions. Throughout this article, the following types of servers are grouped into a single category called application enumeration servers: Web Interface 2.

In Version 1. To mitigate this risk: Always use HTTPS between the client and the application enumeration server to prevent an attacker from intercepting the ticket as it travels from server to client. Reduce the ticket time-to-live as much as possible to reduce the amount of time an attacker would have to transfer the ticket from Machine A to Machine B. A : During normal operation, a ticket must travel the following four segments of the network: From the STA to the application enumeration server From the application enumeration server to the client From the client to the Secure Gateway server From the gateway to the STA The first and last segments exist only between servers in your DMZ and the STA on your trusted network, meaning that an intruder would need to have access to your network to intercept the ticket along those lines.

To secure the second segment, put a certificate on your application enumeration Web server and allow clients to connect only if they use HTTPS. The third segment is always secured with SSL. To meet the requirements of the third bullet item, the CA root certificate needs to be installed on the Secure Gateway server and on the application enumeration server. Take care when installing the root certificate: You cannot simply double-click a root certificate file and run the certificate import wizard.

When asked which certificates to manage, select Computer account and then Local Computer. Browse to select your CA root certificate and complete the import wizard. Open Internet Services Manager. Right-click Default Web site and view the Properties. On the Web site tab, change the TCP port number from 80 to Click OK.

The preceding change also affects any other resources you published from the STA Web server.

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