Firewall in Avast Internet security 6
Just to set the record straight, both the avast! and the Windows Firewall can be turned off.
Neither have to be turned off because they work very well together.
That's why colo39 hasn't run into any problems on any of his computers even though he was using both Firewalls at the same time..
I definitely would not try running any other two firewalls together because they will cause a conflict.
As a general rule, you should only have one Firewall and one Resident Anti Virus program on your system.