issh over 3G vs WiFi

I have anissue with issh where I can connect using VPN to the company
I work for using WiFi from home and the I can uses issh no problem.
If I attempt to connect the same way over 3G I can't connect with
issh. Is anyone aware of parameters that would need to be set in issh
or network settings that may need to be set either on the iphone or on
the corporate network in order to enable the 3G access. I bought the
app because it would make on call support easier not having to be
tired to the house but so far I can only get access via WiFi.

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