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So this is my first question: did it download the ICA file? How can we find out? Easy like that: The Citrix receiver (former names: ICA- client, ICA plugin, Citrix client, and approx 1.742.946 names more) is started, we successfully passed the first stage. I have already mentioned: as soon as the ICA file is created and returned to the client the second part starts. It’s essential to understand the connection process you want to troubleshoot! So, where does it break into parts? As soon a NetScaler Gateway was able to resolve the ticket, NetScaler Gateway will try to connect to the target device (XenApp server, VDI devices).NetScaler Gateway will connect to the STA and try to resolve this ticket. The receiver will send the STA ticket to the NetScaler Gateway.We can see this as we will see a progress bar. ( Begin of second part!) Citrix receiver will read the ICA file and The browser forwards this ICA-File to the Citrix receiver.We don’t need to consider this connection to be guilty for our problems as it already tested: it worked fine before! This ICA file is returned to the client via NetScaler Gateway.SSLProxyHost=:443 The FQDN of the NetScaler Gateway used by Receiver I attached a sample ICA file:Īddress= 40 STA324731891 832A84599E0B7449B8578DCB8DBA95 this is STA ID and STA ticketĬlearPassword= E16458A6937769 This is the 1st half of the NFuse ticketĭomain=\ C48CC641E8301B33 This is the 2nd half of the NFuse ticket The ICA file will contain the name of the NetScaler Gateway (FQDN), the NFuse ticket and the STA ticket (don’t mix these up!) together with some information about the screen resolution, clipboard mapping and so on. The store we use is called STA, and it’s usually one of the XenApp servers or XenDesktop DDCs ( desktop delivery controller). Getting an STA ticket: This is the first source of the problem I want to go into: We have to store the target’s IP address inside our secure environment.The IP address together with this NFuse ticket is returned to StoreFront (Web Interface).

The machine returns a so-called NFuse ticket (NFuse is the old name of Citrix Web Interface). XML broker service selects a resource, a desktop or an application, connects to this resource’s IP vis HTTP(s) (XenDesktop) or IMA (XenApp up to version 6.5), and stores this user’s credentials inside this machine. This click is proxied via NetScaler Gateway and StoreFront (WI) to XML broker service. So no need to check here, it’s already checked: Logon works perfectly fine, the connection to StoreFront / Web Interface worked fine, and its connection to XML broker service is tested (we would not see any application if any of them fails) We now know: NetScaler Gateway was able to authenticate the user, it also connected to Citrix StoreFront (or Web Interface) successfully and StoreFront was successfully connecting to XML broker service. So logon is done and without any issue as soon as we see applications!

The user will see applications only after logging on successfully.

These credentials are checked against logon providers like LDAP and RADIUS-based sources (Active Directory, RSA, Safe Word, SMS Token and many more).

a user connects to the NetScaler Gateway website and is prompted with a login page.

If you still use Citrix WebInterface: not much difference there, but my screen shots won’t be of any help. I talk about using Citrix StoreFront website, there is not so much difference to a receiver for web site. Let’s try to understand what’s going on: The stages of a Citrix NetScaler Gateway connection I want to keep away from misleading tips, instead guide you through a well-structured troubleshooting guide. They hardly ever ask: Which component is guilty. Most of the answers don’t focus to the right source. Questions about connection issues come up quite often. I am one of the moderators of a Facebook group about Citrix. It seems to be annoying and hardly possible.

#Error cannot connect to citrix xenapp server how to#

So I will divide my blog into three sections: How to find the source of trouble, Troubleshooting Citrix StoreFront and Troubleshooting Citrix NetScaler Gateway.

There are two potential sources of trouble: Citrix StoreFront and Citrix NetScaer Gateway. The reason for this is the way connection issues are reported. One of the most annoying issues in Citrix NetScaler is ICA / HDX connection issues.