Cannot connect to my server

[xplodr]

Hey all, my uncle is trying to connect to my server, he has the exact same version of EQ that I use and he can log into other servers. But he cannot log into mine. Other people from all over the country have logged into my server before, I am still able to log in from my pc and several other ones I have access to. I understand it sounds like he has an incompatible version, but that's not the case. His is EXACTLY like mine. When he tries to log in to my specific server is when he has the trouble. He logs in fine, then clicks my server and the client goes black like it's connecting but never shows the loading screen and 5ish minutes later he is back to the log in screen. Any ideas?