Issue:

After upgrading netscalers to 13.0 84 version from 12.1, on RfwebUI theme for Citrix gateway VIP URL, the URL opens as expected but when users login, it immediately throws an error on screen “Cannot complete your request”

On default theme (black theme), after users enters their credentials and click signin, it says Http/1.1 Internal Server Error 43531

Solution1:

While using classic policies on 12.1 ADC version, session policy is configured as REQ.HTTP.HEADER User-Agent NOTCONTAINS CitrixReciever && REQ.HTTP.HEADER Referer EXISTS

Changing the expression to below resolved the issue.

REQ.HTTP.HEADER User-Agent NOTCONTAINS CitrixReciever

Solution2:

Goto your netscaler gateway vip, check the session policy configured for that vip. open that session policy and navigate to published applications tab. If you’ve used load balancing SSL vip in published applications tab (web interface address option), then check if that lb vip status is up or down. If down, check the certificate on that vip.