While experimenting with my new antivirus program's firewall, I put it into "stealth" mode by creating rules to block all inbound TCP/UDP connection attempts initiated by a remote computer.
In the firewall log, I'm now seeing that whenever Thunderbird fetches my mail, my firewall is blocking at least one inbound connection attempt from my website's port 995, addressed to various ports on my PC: 3582, 2609, 2607, 1101, 4963, and others...
However, I'm still able to send and receive email just fine, so it seems like these refused connections are something not essential to the email retrieval process.
Does anyone know what's the purpose of these reverse-direction connections back to my computer?
...and why blocking them doesn't seem to make any difference?
Edited by SteveW, 19 July 2011 - 06:44 AM.