File transfer problem !

I am using ejabbered 0.9.8 with Trilian pro 3.1

Some users can not send files between each other! But somebody can send files!
Is this server problem or client ?

The server does not handle

The server does not handle file transfer. They are done from client to client. So it is a client problem. Some users may have a firewall that prevents file transfer.

May be it would be possible

May be it would be possible if server cuts the message headers?
Client says to all about avatar's information but it cant send file of avatar, so avatars stay empty.
There are no firewalls - it is local network.
What the problem could be?

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