Note that if you have this software installed, the easiest troubleshooting step to determine if this is the cause of connectivity issues is to simply remove the software and reboot the server.
KB 961293 Unable to access Shares “The specified network name is no longer available” when Symantec Endpoint Protection prior to 11.0.4202 (MR4-MP2) or Symantec Antivirus 10.2 are installed on a Windows 2003, 2008 or 2008 R2 Server KB 961654 A file sharing connection to a Windows Server 2008-based server drops unexpectedly if the server has Symantec Endpoint Protection prior to 11.0.4202 (MR4-MP2) or Symantec Antivirus 10.2 installed KB 948732 Network shares become unresponsive after some time on a Windows Server 2003 or 2008 or 2008 R2-based-based computer running Symantec Endpoint Protection prior to 11.0.4202 (MR4-MP2) or Symantec Antivirus 10.2, and you receive an error message KB 923360 You may experience various problems when you work with files over the network on a Windows Server 2003-based or Windows 2000 Server-based computer All of the articles also refer to the Symantec Knowledge Base article about the issue, including information about how you can obtain the fix.
The University of South Alabama Computer Services Center is participating in an Educational Site License Program with Symantec Corporation, the makers of Symantec Antivirus Software (a.k.a. As a result, SAV may be installed on all University-owned computers without charge to the department or user.
Symantec confirms that this is a known issue and there are updates to resolve the problem.
For more information, please see the Symantec Knowledge Base article about this issue.
While the error messages are not specific to this issue, and can often have other unrelated causes, versions of Symantec Endpoint Protection prior to version 11.0.4202 or Symantec Antivirus 10.2 on a Windows Server can cause these connectivity problems.
The real frustration can be the difficulty in determining that the root cause may be due to these third-party products; the intermittent loss of productivity and reliability of client connections to the server often results in costly and time-consuming investigations.