Rephrasing:
Some people can't host anymore, basically everyone with a --- ping.
This is not a problem related to:
Add-Ons as I attempted to host with only default Add-Ons enabled.
Port Forward as me and everyone else (supposedly) hosted before with no problem.
IP as I have a Dynamic IP and I changed a few times with no effect.
Other problem that would've required a PC restart (does no difference).
UPnP as I attempted both enable and disabled.
Dedi/Local server as both end up the same, and you aren't even able to join your own server if it's dedi.
Additionally I ran a test with a friend, using a connection logger (external program) I checked the connections, I had none with him while he attempted to join my server, but I did have some connections running through the Blockland service.
On top of that, if it helps anyhow, here's the console.log.
http://pastebin.com/UrXysGLJ