SMALL OFFICE ADMINISTRATION computer disconnected problem

Hi, I am new to this as I just bought the small business suite for 15 pc’s

I made the installation as instructed from the wizard and manual and at the first everything was OK.

I could see all the managed computers online with no problem.

Now I am experiencing problems as many of them apear to be disconnected.

Please advice what should I do to solve it.

file from troubleshooter if may help

http://we.tl/67SZtAGqLs

Please ask here: http://forum.avast.com/index.php?board=33.0