Web Interface Protocol Driver Error?, in the Citrix Web Interface forum on BrianMadden.com

I recently setup a test environment to begin the upgrade process for our WI servers. I've been able to enumerate both of my Citrix Farms in the "MetaFrame Presentation Server Administration" console and all apps show up.

The problem is, only one of my farms will connect to the apps. Any time I click an icon in the other farm, the connection begins and then I get a "Protocol Driver Error" message with an "OK" button. I don't know where else to check things, as everything "seems" to be setup correctly. The *** of it is, I've had it working for a while and made some changes that are apparently screwing me up.

Any advice would be most appreciated.

Check this thread
http://support.citrix.com/forums/thread.jspa?forumID=75&threadID=73570&tstart=0