Having problems with calls in LAN

Problem description: Sometimes ago i used MSN with my brother (on the same network) and it worked fine from 5.0 to 7.5 but now it says Connecting and then the call automatically closes… Like when i call someone not in LAN

Error code/error message: the conversation with … is ended

What has been tried so far: Just testing other versions but nothing

Messenger version: From 5.0 to 7.5 :stuck_out_tongue:

Windows version: 7