Many folks have been encountering network connectivity issues and other errors when running older versions of Symantec Endpoint Protection and Symantec Antivirus. "If you're running older versions of Symantec Endpoint Protection 11 and Symantec Antivirus 10.2 you can get solution from Symantec. Symantec confirms that this's a known issue and there're updates to resolve the problem. More Info: Symantec Knowledge Base article or Symantec Support site. Please note: If you're unable to upgrade promptly or remove the software, Symantec urges you to contact their technical support to determine if there're any workarounds available to you," Microsoft.