Since when and who fixed this issue? Did Avast fix this issue already? It did not only affect Comodo Firewall but also Windows one as well.
Egemen the head developer of CIS:
"The issue is avast intercepts WEB connections at the driver level and redirects connections to its own local proxy.
Because CIS operates at NDIS layer i.e. the lowest layer of the protection, it sees the actual connection i.e. avast proxy. Normally CIS should have blocked the loppback area connection to the proxy however because of the limitations in Windows 7, it fails.
CIS uses TDI, WFP and NDIS to provide its firewall functionality. WFP maybe enough ti implement an average firewall but it is not enough for a firewall like CFW so that it could not be used alone wihtout the support of the other 2 technologies. Windows 8 allowed us to use WFP more than previous windows editions and it should not be a problem with the next CIS editions which support Windows 8."
So Windows 8 is the only OS which don't seem to have this issue. Windows 7 is still not fixed.