can u refer below the links and once again,can u explain your question briefly.
please check the name resolution - make sure that you can resolve the server name from the client - and vice versa
I would also suggest you disabling the firewall completely .
Ensure that the account you are using on the server is a local one (rather than domain based).
Again my problem is I have one of the database users connecting to my DB server from his local machine using management studio and when they want to add a new login to the DB server they go to security-->New Login --> Search (to pull a list of logins) so when they click the error message which I posted in my original message.
Verifying DNS resolution makes sense to me, I'm in the process and will let you know. But I dont understand disabling firewall rules, how can they make a connection to a remote server at all if there is no firewall rule in the first place ?
Today is the tomorrow you worried about yesterday:-)