Originally Posted by
Zirusianna
I am guessing he's using the client? Because the client streams whatever folder you want it to, and the files in the folder is the world it streams to the server. You have to set all of that up and stuff, but you can basicly take the local files from his appdata/local/minecraft (or something) and re-make the server. But that's the worst-case scenario.
He could also look at the folders and, if he knows his stuff, notice if he is missing a file :3 Though I think it's his internet or a firewall blocking it.
Oh, and remember to update Hamachi!