Board Thread:Modded Server Technical Support/@comment-27043886-20151004104918/@comment-25612015-20151006060407

Your log file doesn't say much, apart from:

[Server thread/WARN]: Can't keep up! Did the system time change, or is the server overloaded? Running 2495ms behind, skipping 49 tick(s)

Which could indicate that your server's machine is overloaded right from the start.

After that, you successfully connect and stay connected for 5 minutes, before, if I read you well, going into the Middle-earth dimension.

At this point, if there's a problem loading this dimension or getting out of memory it is not logged...

Unfortunately, vanilla Minecraft or Forge won't help you much with debugging the situation.

The only additional things you can try are:
 * using the "/debug start" command to activate profiling information, but I don't think it will help much
 * allocating more memory to your server. In my opinion, 1 GB is definitely not enough!

Then, a better course of action would be to install the (server side only) ServerTools mod, which has additional commands such as /memory, /entitycount and /tps.

You'll have to use then from the server console, right after launch before anyone is connected, after someone connect into the Overworld, after someone connect into the Middle-earth dimension.

It might help understand the situation...