Yes, I can port forward that port, no problem. That is not the issue. Again, I don’t think that I have a problem.
Looking at the installation guide, you don’t really need to open that port - “If you want more peers and better network connectivity, you should also try opening port 8444 on your router so other peers can connect to you.”
That section is kind of misleading (IMO) for two reasons. The first is “If you want more peers.” The number of peers your node will try to maintain is specified in config.yaml (target_peer_count). If you see that many peers in your Connection section, your node will not accept any more connections whether that port is open or closed.
The second is “If you want … other peers can connect to you.” This is P2P network, so all peers are equal. There is no difference for a node, whether it connect to peers up to the specified limit, or it let peers connect to itself - basically, the same end result.
Although, from the whole network point of view, maybe having that port open is preferred. Assuming that all nodes will have that port closed, that would lead to a situation where there are plenty of nodes out there, but no one is accepting any connections, so all nodes are isolated - nothing works. Although, I don’t know how Chia is using UPnP, so maybe even with that port closed for that port checker, it opens that port for some specified peers, so they can connect (basically white-listing some peers)
Lastly, this statement “better network connectivity” is a bit vague. Not knowing what that means, rater implies to ignore that (as I said, I don’t think I have any problems).
Although, the main difference for me is the security. If that port is closed, it means that the node will get a list of available peers from somewhere (config.yaml - introducer_peer), and only open connections for those peers. That limits the possibility of some rogue entity from trying to hack such node.
Sorry, another long one, and a bit off topic. Although, my understanding was that chia is using UPnP to open that port for anyone. Maybe that is not the case. So, the fact that my port is closed looks like have no value with respect to your original problem (Comcast blocking that port).
Although, what all that would imply is that even if Comcast will decide to ban all of us, that just will not work. So, unless you really see / have problems, maybe you should not worry about that.