Problem after upgrade IOS

Hi,
I upgraded my ios to ios5 and when I connect in my work by VPN the app doesn't connect in my PC, but when I try use app in my work by wifi the app connect normally.
The app worked normally by VPN in IOS 4.3.
What do I do for resolve my problem?
Thanks.
I upgraded my ios to ios5 and when I connect in my work by VPN the app doesn't connect in my PC, but when I try use app in my work by wifi the app connect normally.
The app worked normally by VPN in IOS 4.3.
What do I do for resolve my problem?
Thanks.