close all your 3rd party programs.. all applications that running on your desktop especially programs that uses internet.. try to off your anti-virus
try that..
Just like Ravenant said, close all your 3rd party programs, and if you have softwares like speedbit try to uninstall them then try again.
If the problem still persist then send your llahlog.dat to RESiSTANT located in your InfinityMU Folder
> InfinityMU\MuGuard\llahlog.dat