Endpoint Protection Plus not reporting the security sto SBS2011 standard console

We have a Dell Server with SBS2011 installed along with Avast Endpoint Protection Plus and Avast Small Office Administration.
In total we have 30 seats.
Not all of the online computers are reporting the security status back to the SBS2011 standard console.
Some are Windows XP Professional, While most are Windows 7 Professional.
2x are reporting the status ;D, and 28 are not.
:frowning:
All 30 machines were installed direct from the server and I have double checked the installation, license etc.
They all report back to avast small office as green ticks.

Please what am I missing, :o

Resolved it, Avast firewall was on with the m$ firewall.
Changed it within the server to switch off the windows firewall.