This article has been archived. It is offered "as is" and will no longer be updated.
Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows XP and Windows Vista
When you transfer large files over a slow network link in Microsoft Office Communicator 2005 or in Microsoft Office Communicator 2007, you receive the following error message:
Cannot send file name to remote user. This may be due to firewall restrictions or network problems. Please try again. If you need further assistance, contact your system administrator.
This issue occurs because the original Session Initiation Protocol (SIP) session that initiated the file transfer expired.
When you transfer large files, the default idle time-out period is 10 minutes. Any file transfer session that exceeds this period generates the error message.
To work around this issue, increase the idle time-out period of the SIP session to a period that is longer than the time that is required to copy the file.To do this, follow these steps.
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.
Click Start, and then click Run.
In the Open box, type regedit, and then click OK.
Locate and then click the following registry subkey:
On the Edit menu, point to New, and then click DWORD Value.
Name the new value "IMIdleTimeout."
Right-click IMIdleTimeout, and then click Modify.
Click Decimal under Base.
In the Value data box, type 60, and then click OK.
Exit Registry Editor.
Important When you follow these steps, you increase the idle time-out period to 60 minutes. This increase causes other issues to occur when you use the multiple points of presence (MPOP) mode. Users who switch between different devices may experience these other issues. Therefore, we do not recommend this workaround for MPOP users.