Asked by:
OCS2K7 - File Transfer Issue External-Internal/Internal-External

Question
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Hi everybody,
we experienced problems with File Transfer on peer2peer communication between 2 communicators 2007 clients.
File transfer has been enabled. No File Transfer filter.
Everything works fine in internal mode (internal-internal)
Everything works fine in external mode (external-external)
But it does't work in external-internal or internal-external mode.
Of course we have opened Enterprise and workstation Firewall ports 6891-6901 TCP.
Network trace shows that there is problem with the IP @ of the external client (the internal client tries to send the file to private IP @ of the external client) (external client is behind an XDSL Box)
No problem during A/V , presence or IM ....
Wednesday, October 17, 2007 7:43 AM
All replies
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I have the same problem.
When I trace request in ISA Server, I discover that my computer send a request to a private IP to an external client, when I receive a file.
Any idea ?
Tuesday, December 18, 2007 4:29 PM -
Any new findings on this issue???Monday, June 23, 2008 2:32 PM
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There is no solution for this problem
As it is peer to peer it does not work well with NAT
Monday, June 23, 2008 10:19 PM -
Deli is correct. It is a peer to peer connection. It would take one heck of a proxy to figure it out.
Office Communicator
6891-6901
TCP
Port ranged used by Office Communicator for file transfer.
It may be possible if you are using a NAT pool and have these ports open. It would probably require some kind of fixup of the ports as well. If you are in a PAT pool, there is now way.
Tuesday, June 24, 2008 3:49 AM -
IPv6 will solve this problem in the future
Tuesday, June 24, 2008 9:18 AM