Question : firewall ports needed for citrix presentation server

i've got a client that has a win 2k3 citrix presentation server that sits behind a firewall. yesterday the firewall went down and one of the users reset the firewall to the defaults loosing the custom port configurations. there wasn't any documentation on the ports used. the remote users access a citrix web interface on an ip with a custom port and then login using ad credentials. i can get the web interface to show the login page and i can login using the appropriate credentials but when i go to run an app i get a "connection in progress" box which times out with an error "cannot connect to the citrix xenapp server. there is no citrix xenapp server configured on the specified address". i've got the following ports open at this time:

tcp 1494 client virtual desktop
tcp 2598 client actual desktop
tcp 27000 citrix licensing
tcp 2512-2513 ima
tcp 9090  custom xml
tcp 8081 custom web interface port

this was a working environment from outside which actually was setup by a citrix engineer and it works internally across their network now. i'm just missing a port somewhere that needs opening to make it work from the web again. i don't have any udp ports open and maybe i need some? can someone identify what i'm missing to make this right?

Answer : firewall ports needed for citrix presentation server

This is XenApp, not XenServer so none of that will help :)

You should only need these using the WI

Application requests - TCP XML 80, 8080 or 443 (configurable)
Access to Applications Virtualized on the Server - ICA-TCP 1494, 2598 (Session Reliability)