I have a problem with Symantec Antivirus Corporate Edition and TCP/IP on a number of laptops (cached profiles) in a Windows 2003 AD.
When a user logs on to the machine they get an error message with the title "Symantec Email Proxy", no text, Red X graphic and an OK button. This error message appears twice.
Then apparently everything works as usual until the user attempts to access the internet or synchronise their documents. They can't access anything beyond their own machine.
Running IPCONFIG gives the following output: "An internal error occurred: the request is not supported. Please contact Microsoft Product Support Services for further help. Additional information: Unable to Query Host Name."
The machines are running Windows XP Pro SP2 with the latest patches, and the Symantec Antivirus Corp Ed Client, and they are managed in a Windows 2003 Server AD.
I have tried the following (in alternating order, with and without rebooting) :
Reinstalled TCP/IP with the "netsh int ip reset [ log_file_name]" command.
Reset winsock2 with the "netsh winsock reset" command.
Disabled the Symantec "Internet E-mail Auto-Protect" function, both on the client and from the Symantec System Center (we use no POP3 email clients on the machines).
Disabled the different Symantec services on the client.
Uninstalled the Symantec Client altogether.
I also found an entry on the Symantec Knowledgebase regarding a Symantec Email Proxy error message, however it seemed as if it was only geared towards consumer/stand-alone installations.