Nothing has changed that i can remember, yet neither my MC server nor any LAN world works anymore. they simply cannot connect, and my ports dont seem to want to forward. I do not have access to my router so i use upnp portmapper to forward 25565 normally, and it usually works but randomly stopped working a few days ago. Heres what i've tried:

* restarting my computer
* restarting the router
* resetting my network adapter
* testing to see if my port is really open (its not... :/)
* sending my friend the direct connect ip adress (external ip found on http://www.whatsmyip.org/ with the 25565 port added)
* upnp port mapping (again, doesnt work anymore...)
* having my friend host the world instead
* turning off windows firewall and my antivirus software (malwarebytes)
* allowing all java programs through the firewall and the antivirus
* ignoring the port that the lan world claims to be open on and just telling him to connect on 25565
* Logging in to my router (default pass doesnt work, dont own the router so i cant factory reset it without permssion)