Tekkit Server To Vanilla Server

[MagicJ]

Title: Tekkit Server To Vanilla Server

Version: 3.0.3/3.0.4

OS: Home Computer

Java Version: Java Version 6

Description of Problem:

Basically I tried to switch from a tekkit server back to a vanilla server and it just won't let me, the tekkit server is overpowering my vanilla server and dominating the ip use so when I turn on my vanilla server it says that everything is fine, but no one can join the vanilla server. at all it says when I got to muiltplayer can't reach server

Any Help?

Error Messages:

Error Log: