Hello, I am Robert Paige from the Windows Server Partner Ecosystem Team. I wanted to resurface a continuing support issue with deployments that I first commented on back in December of 2009, and again in a March post. After a very encouraging decrease in support incidents traced to this issue, we’ve seen an upward trend again for the same issue – perhaps a reminder will reverse the trend!
If you are running certain older versions of Symantec Endpoint Protection or Symantec Antivirus, you can get the solution from Symantec. 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. For information about Symantec support for Endpoint Protection 11, visit the Symantec Support site.
Please note: If you are unable to upgrade promptly or remove the software, Symantec urges you to contact their technical support to determine if there are any workarounds available to you.
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. To make the matter even more frustrating, it does not happen immediately after installation of the security software, the interoperability issue can sometimes happen weeks after deployment.
Here are the most common symptoms you may experience that may help you diagnose this issue. 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.
Could you please add some info on Symantec Antivirus 10.2 (btw, link to it leads to file:/// not web server)?
We use both Symantec Antivirus 10.2 and Symantec Endpoint Protection 11 on our servers. But nor in Symantec Knowledge Base article, nor Microsoft KB articles Symantec Antivirus 10.2 doesn't mentioned at all, perhaps, because that version is discontinued. I'm not really sure if we have to patch it too.
You mentioned versions prior to 10.2 which means that 10.0, 10.1 have that problem, but not 10.2, doesn't it? If I'm wrong with that assumption, please, if you can, provide 10.2 build and pack level where problem is solved.
Thanks for the comment! I fixed the link you point out to what Robert originally intended, and also modified the first sentence in the Solution section to remove the version information from there, as it is clarified later. Robert confirms that Symantec Corporate Antivirus 10.2 does not exhibit the behavior.
- Mike Platts
Thanks a lot! So we have to address the issue on just one of our servers which is under Symantec Endpoint Protection 11.0.2000
I had this issue. We don't have symantec antivirus on the server. I looked really hard and found this -
Disable "Large Send Offload" ipv4 and ipv6 on the virtual network adapter.
It seems to be working for me, though I won't feel right for a few days. Our server is a windows 2008R2 virtual machine. I can't claim to know if this will work on a non-virtual system.