We are using Kerio Control 7.1 and we have several Citrix / Terminalservers. We are facing the problem that the authentication dialog is displayed every time a user opens a browers session. Automatic authentication does not work. Even if the username and password is saved in the browser, the user have to hit on ok on the authentication dialog box. Now the strange thing is that NTLM is configured correctly, but it does not work on Terminalserver using the "force non-transparent proxy" in Kerio Control. If this option is disabled NTLM works just fine on the Terminalserver, but of course only the first user is authenticated and the following users on the Terminalserver are using the first authenticated account as well.
Now this is really a pain, because we have to use the Terminalserver option in Kerio Control, since we don't want that every user has the same internet rights. Why is NTLM not working in this configuration? This issue has been discussed before on this forum, but there is not a solution yet...
The only workaround I figured out so far is to use Firefox with the AutoAuth (or FoxyProxy) Plugin, which sends the authentication data automatically to Kerio, so that no authentication dialog is displayed. But I would prefer to use the Internet Explorer, since you can it configure on the Domain Controller via GPO. I know there is GPO Version of Firefox as well, but still I have to install security updates on every single server from time to time and the are other issues, why I would perer to use the Internet Explorer.
Any ideas or workarounds how to configure automatic authentication on Terminalservers with the Internet Explorer? It does not have to be NTLM, I would configure every single user on Kerio as well, just to make it work!
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