We are currently testing a Barracuda internet content filter box on our LAN for a handful of test users. When IE is set to use the Barracuda as its proxy I cannot connect to any databases using Visokio. I have tried a SQL connection and an ODBC connection but both time out. If I remove the proxy settings from within Visokio the problem still exists. The strange thing is that the ODBC connection itself works fine, and I can establish a Telnet connection to the DB server OK from command line. The problem seems to be specific to Visokio. I can only make a successfully DB connection when I remove the IE proxy settings. I have reviewed the Barracuda logs and cannot see any sign of the traffice being logged, let alone blocked.

Can anyone provide any assistance?