I just got an ADSL connection. All my previous connections had been through dial-up or broadband USB modems, so this is my first exposure to this type of hardware, and my knowledge is seriously lacking in this area. I’m not even sure I can formulate an intelligent question, but I’ll try.
Running uTorrent, Comodo FW was showing me Blocked events, both TCP and UDP, with a Source IP being that of my router, various Destination IPs and various Source and Destination ports. Only SOME of the Source Port entries refer to the port I’ve designated as the “Port used for incoming connections” in uTorrent. Also, uTorrent was showing me a red exclamation mark in the Status Bar where we should have a check mark in a green circle.
I added a rule to the uTorrent Predefined Firewall Policy which says Allow TCP/UDP OUT, Source Address=my router’s IP address, Destination Address=ANY, Source Port=my uTorrent port for incoming connections, Destination Port=1025-65535. uTorrent is “running green”, but I still get the occasional alert, and some Blocked entries in Firewall Events.
Firstly, I don’t see why the rule I added should have any effect, given that there are already rules that say Allow TCP or UDP OUT, Source IP=ANY, Dest IP=ANY (in accordance with the published recommendations for uTorrent rules). ANY should include my router’s IP address, no? So why would my adding a similar rule, but designating a specific Source IP instead of ANY make any difference?
Secondly, what do these Blocked entries actually mean? I’m interpreting the fact that the Source IP is my router’s IP to mean that these are Outgoing connections. Why would uTorrent be trying to connect to ports other than the one I designated for it to use for incoming connections?
I’m aware of the concept of Port Forwarding, which is not to say that I understand it’s purpose. But given that uTorrent is apparently happy, is Port Forwarding something I should be looking into? Am I partly answering my own first question here?
My apologies if I’m sounding dumb - this is all new to me. I’m not quite sure that the above are the only things that confuse me, but it’s a start.
Thanks for any input.