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File Transfers using MSN Messenger

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Article ID: KB4029 KB Last Updated: 05 Jan 2009Version: 3.0
Summary:
File Transfers using MSN Messenger
Symptoms:
Environment:
  • MSN Messenger
  • Sender of file transfer received following message in MSN Messenger: We could not send this file because the connection is blocked. Please contact your network administrator or Internet service provider; they may be able to enable file transfers.
  • Recipient of file transfer received following message in MSN Messenger: You have failed to receive file ...
Solution:

 File transfers on MSN Messenger work only if the NetScreen is in route or transparent mode.  The MSN site explains there are problems with file transfers if the client is behind a NAT device.

If in transparent mode, and the MSN Messenger client is behind the NetScreen, an outgoing and incoming policy is required.  First, create a custom service for MSN Messenger File Transfer.  MSN Messenger file transfer operates on TCP ports 6891 through 6900.  This allows up to 10 simultaneous file transfers per sender. 

Configuring MSN Messenger File Transfer Service:

WebUI:

  1. Click Service
  2. Click Custom tab
  3. Click New Service
  4. Service Name: MSN File Transfer
    1. Source Low: 1024
    2. Source High: 65535
    3. Destination Low: 6891
    4. Destination High: 6900

Create the outgoing and incoming policy using the MSN File Transfer service in the policy.

Command Line Interface:

set service "MSN File Transfer" protocol tcp src-port 1024-65535 dst-port 6891-6900 [Enter]

Create the outgoing and incoming policy using the MSN File Transfer service in the policy.

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