File Transfer Issue - Communicator 2007 RRS feed

  • Question

  • Environment:

    We have one OCS 2007 FE server and one OCS 2007 Consolidated Edge server.


    I have few users who can send files through Communicator 2007 but cannot receive files.

    I have also users who don’t have any issue in sending/receiving files.

    I have few users who even cannot send/receive files.



    Are there any known reasons why it works for some users and not for others?

    Do I have to allow TCP ports 6891 – 6900 on our firewall for external file transfer?


    With best regards,



    Thursday, April 10, 2008 4:31 PM

All replies

  • File transfer is peer-to-peer TCP 6891-6900 from to/from everywhere for file transfer to work (not sure about double nat issues)


    Wednesday, April 16, 2008 3:03 PM
  • i also face the same problem...is it the firewall need to open port for file transfer?
    Thursday, April 24, 2008 6:43 AM
  • i also get this problem, we have allow port 6891 -6901 on firewall (ISA and ASA) inside and outside but its same we can't send recevie file using OCS, any have solution and advise for this case??

    Monday, October 19, 2009 7:28 AM