This Knowledgebase article provides information about Neverfail for Exchange NNTPSVC generating the warning 'Unable to add the virtual root' in the Windows Application Event Log after a switchover.
After a switchover, NNTPSVC may generate warnings of the following type in the
Windows Application Event Log:
The server was unable to add the virtual root '/' for the directory '/Internet
Newsgroups' due to the following error: The parameter is incorrect. The data is
the error code.
This is a known error with NNTPSVC.
This error can safely be ignored.
Neverfail for Exchange 2000 and 2003
For more information, please see http://support.microsoft.com/kb/298848/en-us .