We have an odd error that is occuring for staff who access Citrix sites - they can login and select an application but they get the 'There is no Citrix SSL Server configured on the specified address' and cannot run the applications. This is such a vague generic Citrix error that it may as well just say 'Error'!

As an administrator these sites all work fine - but I'm not sure why. All users (admin and staff) go through our Smoothwall box and these sites are all whitelisted. Everybody uses the same firewall (after the smoothwall) so again I can't see a difference that would cause the error.

The only other thing I can think of is group policies, but they haven't been changed recently and these sites used to work OK before!