When a client computer connects to a Windows 2000 or 2003 server using an alias, the client receives:
System error 52 has occurred.
A duplicate name exists on the network.
This error occurs when you attempt to connect to the server by using a CNAME alias that is created in the DNS zone:
net view \\alias.<domain name.com>
where alias is a CNAME record that is created for the server in the <domain name.com> zone. Because the server is not listening on the alias, it does not accept connections to that name.
Start – Run - Regedt32
Create the following DWORD Key manually.
Shutdown and restart the server.now alias should work again.