File transfer not working

I just set up an OpenFire server connected to Active Directory. I installed Spark on two machines and everythings goes fine until I try to transfer a file: user B never receives invitation to download file from user A.

All the computers are in the same network.

Any ideas? Should I set something in the Windows Firewall?

Thanks!

I Have the same problem, Jabber-to-Jabber account works fine, but when

send a file to MSN Transport Contact donĀ“t work.

Any Suggestions?

windows firewall could be the problem. a simple test would be to turn it off.

File transfers with gateway contacts is not supported.