I'm new to Linux.
I have a 12.04 dev box at work. I can tunnel to it using ssh and can successfully access the desktop, build using maven, etc.
However, when I try to run any git commands to get source from the internal git repository, I get this error:

x11 forwarding request failed on channel 0

I have searched high and low but cannot find out how to fix this.
Where do I start?