system
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If you are running Comodo firewall with default settings, it should have created a firewall rule for avastsvc.exe allowing all TCP outbound.
However, Avastsvc.exe needs unrestricted inbound and outbound access to localhost i.e. 127.0.0.1. Check your global firewall rules to ensure you are not inadvertantly blocking inbound or oubound access to 127.0.0.1.
Your Local Area Network Connection definition in Comodo should contain your router DHCP IP address range e.g. 192.168.x.x/255.255.255.0 and your localhost IP address range e.g. 127.0.0.1/255.0.0.0.