Are you able to create a locally hosted server?
Or set up a dedicated server and join that?
Which type of connection does you use?
Is there any restrictions on your firewall, or anti-virus software limiting any outbound connections?
Are you using the MWLL_Launcher to run the Mod with.
In the Game Menu does it state 1.1.1.6165 in the lower right corner? and MWLL 0.2.0. above that text?