Can't connect to some servers (login, games, and website servers)

After what appeared to be a large scale infrastructure maintenance in my area by Xfinity a week or two ago, I've begun having problems connecting to servers.

I can't connect to some login servers due to port issues even though I know I'm clear within the modem settings. An example is I can't login to my Topaz Labs account within their programs.
I can't connect to certain games anymore. Namely Riot games. I also see this has been a reported issue already.
Some website have begun to stop responding unless I use a VPN.  Otherwise if I spam refresh for long enough. Maybe I'll get something to load but quickly comes back with errors.


An IPv4 change was also a result of the servicing. No longer having the IP I've used for over half a year now. So I initially thought I had been given an IP used in cyber attacks and I've been blacklisted. But that doesn't appear to be the case as I would expect issues on more than this select number of things. Most of which act more like a firewall issue or port access issues.

I've attempted DNS flushing, modem restarts, network settings resets, double checking xFi advanced security it disabled. Nothing is helping on my end.