WilkoSkitz

I'm getting the same issue here. I think it's an issue specific to the server - but could also involve the Minecraft authentication servers.

The issue is with Apple - they released an update for every version of Mac OS X which moved everyone over to Java 7 r6 (followed by 9 recently). Some of the plugins within Tekkit & Technic require Java 7, others require Java 6 - Apple removed Java 6 and because they control the update flow to Mac OS X, it's unlikely we'll see it again. Using the latest lwjgl will not work as it is the plugins that require the specific versions of Java. It's over to the individual developers and the TechnicPack crew for now. I'll be looking into the issue to see if I can find the good old Java 6 and a way to re-install it - maybe even use OpenJDK.