yep, it's not accepting any client.
(First of all, please pardon me, I am just making sure, not pointing that you plagiarized (copied) others' files)
Be careful with the client. is that client you made it by yourself? or you copied someone's?
Because some people did a modification in their clients and dlls so that they put the clientinfo.xml inside the client, not in the data folder anymore. I did it too
if you are sure that you have correctly set the clientinfo.xml, then is it loading other grf files? check data.ini.
If so, is it loading YOUR grf file or OTHERS?
And then, would you like to check your firewall, whether it is blocking your server or not? Nah, Firewall should not block connections from localhost to 127.0.0.1 (localhost)