"Can't resolve hostname" Connection Error

[HoboNoah]

Title: "Can't resolve hostname" Connection Error

Version: 3.0.3/3.0.4

OS: Windows 7

Java Version: .7.0_05

Description of Problem:

So I'm hosting a Tekkit server from my pc with Hamachi.

My friend added the server, but got the Error "Can't resolve hostname".

Looking at the server console, I'm not getting any notification of him connecting at all, not even an Error log. We're both using Tekkit 3.0.3, I can connect to the server fine. It's not an issue with Hamachi, he can connect to my Spoutcraft server without any problems.

Error Messages:

Can't resolve hostname

Error Log:

N/A