Using Comodo Firewall, free AVG, and portable Thunderbird, there seems to be a bug.
When portable Thunderbird accesses the server to check for emails, AVG has an email scanner, which even if turned off, seeks to scan for viruses but gets caught in a loop of failed attempts when the firewall is Comodo.
I then need to shutdown AVG.
This problem does not exist with free Sygate and I can even have the AVG email scanner turned on.
I have a choice in firewalls but not in anti virus. I wish to run AVG. (The Comodo anti-virus isn’t ready to replace AVG in my view and the interface of Avast is poorly designed).
I am presently using free Sygate but will switch back to Comodo if the problem can be solved.