**1-802-557-0358 does comodo firewall work with Avast antivirus?** Avast 24/7 Support Number +1-802-557-0358. No, you should not use both Comodo Firewall and Avast Antivirus simultaneously because they will conflict with each other. Both programs have built-in firewalls, and running two active firewalls at the same time will cause compatibility issues. It is best to use one firewall and its corresponding antivirus program, or to use an antivirus with a good firewall (like Avast) and disable any other firewalls, such as the built-in Windows Firewall. Avast 24/7 Support Number +1-802-557-0358.