Well this is what's going on now:
Is that permitted by your ISP? If not, your ISP may have simply decided to block that usage instead of terminating your service.
For example, Comcast Acceptable Use Policy for Residential service includes this Technical restriction:
I hate to believe it, but this may be the case... It just seems really random that it would happen all of a sudden without any warning.
I'm wondering if there's anything I can do inside the router settings in order to bypass this. I don't exactly know how Comcast was able to do this (if this is in fact the case).
First, as Terry net said check your external IP. www.whatismyip.com and make sure that is the IP you have registered on the dydns systems. Second, when hosting a game server they every often connect on a different port than the standard open ports, plus you are natting This means one of three things,
1) You local computer has a different IP address than before. If that is the case than the port forwarding you have on your router is not pointed correctly any more. You need port forwarding when you nat.
2)the port is now closed on the router, or on you local computer. Check you firewalls (both router and computer)
3) your ISP has blocked the traffic.
I have listed these in order of what I think they are.
I have verified that my external IP is the same and has not changed.
I have forwarded every single port necessary to forward when hosting the server.
I checked both firewalls.
I'm using a Linksys Wireless-N Broadband Router WRT160Nv3. We had to purchase a modem because this router isn't a combo.
I never changed any configurations with the router besides the port forwarding, so I have no clue where I would be able to change whether or not the router can reply to pings.
Basically, I think it could be Comcast blocking the connection, but I'm not entirely sure.
I changed my internal IP from 103 to 102, and I'm still waiting on my friend to see if they can connect with everything reconfigured to that internal IP.
And, in order for users to connect to my server which is being hosted from my external IP (which is routed to a hostname), they'd have to be able to establish a connection (ping) my IP.
I'm just a little lost on what to try next =P