I had some problems with a customers brand new Citrix Server. I can use it locally but I run into problems over VPN.
After some searching the net I found this article on Citrix Knowledgebase. It gave a hint on somethin called Session Reliability whish I hadn’t heard of before. I said that I migth get it to work if I turned session reliability of. And what do you know… they where right 🙂
You can find the setting under Citrix Farm Properties.