Sophos Anti-Virus: a 3rd party application fails when RMS binds to an ephemeral port

  • Article ID: 57606
  • Updated: 01 Oct 2010

Issue
A 3rd party application fails to work under the following circumstances. When Remote Management System (RMS) binds, Windows selects an ephemeral port from the pool of available ephemeral ports. Some 3rd party applications are hard coded to a particular port within this range. If RMS binds to that port prior to the 3rd party application, then the 3rd party application would fail to work.

Sophos product and version
SAV for Windows 2000/XP/2003 7+

Operating system
Windows 2000, Windows XP, Windows 2003

Technical Information
When Remote Management System (RMS) binds, Windows selects an ephemeral port from the pool of available ephemeral ports. Some 3rd party applications are hard coded to a particular port within this range. If RMS binds to that port prior to the 3rd party application, this prevents the 3rd party application from working correctly.

Technically, this is not a Sophos-specific issue. We use the normal process within Windows to select an available ephemeral port, while the 3rd party application vendor is hardcoding a particular port within the standard ephemeral range. This issue could occur with any product that requests ephemeral ports during startup.

What to do

You can exclude ports used by 3rd party applications from the ephemeral range. For details on how to do this, refer to the Microsoft knowledgebase article 812873.

 
If you need more information or guidance, then please contact technical support.

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