Resolve Protocol Driver Errors For Citrix

When a client user tries to connect to a Citrix published application, sometimes, they receive the error message "can not connect to the application. Citrix Protocol driver error."

Check all servers in the published application. You can test all servers? If there is a firewall between the client and the server, check the firewall logs to see if all connections are blocked.

If there is a running firewall software on the client or on the server, disable the firewall software to see if that resolves the problem.

See if you telnet client for each server on port 1494. Otherwise, restart the server. The next step is to check the eventvwr (event log viewer) on all servers in the published application. If "Session Reliability" (Common Gateway Protocol, or CGP) is running, disable it and try connecting again. If you can connect after disabling the reliability of the session, discover that the session of the door to the firewall reliability using Citrix console and make sure that the door is open firewall between the client and the server. Again, you can telnet to port the client to the server.

If you connect via http (http web interface or protocol within an.ica file) try disabling Internet proxy server that you set in your Internet Explorer settings. Also, make sure the "Automatically detect settings" are not selected, go to IE> Tools> Internet Options> Connections tab> LAN settings> Automatically detect settings.

The problem may be a Windows user profile problem.

Log on to the client computer with a user ID and try to connect to the Citrix published application. If you can not connect, the issue should be linked Windows profile. If you can not connect there is probably a problem with the client.

Update Citrix client version. Go to the Citrix downloads section and download and install the latest Citrix Receiver for your machine. Then you can try to restart all Citrix application servers published.

It would also be a good idea to run Microsoft Windows Update to install the service pack and the latest patches for your operating system Microsoft. Also make sure to download and install the latest Citrix patches. (What a correction Otherwise known as QFE Engineering) update (Quick Fix is
​​a single package, which contains a cumulative number of files, used to solve a specific problem in a software product - ?. these bugs Pesky software)

Finally, if nothing else has worked in its attempt to resolve the Citrix protocol driver error, install the latest service packs and fixes on the client.
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