HoMM3 HD bug reports.

Basically, here's the issue: I switched internet providers and now I'm using Wi-Fi. I tried playing Heroes with an HD mod, but I can't connect to anyone, no matter what. The connection with a player in the WT mod is stable, and in Heroes without the HD mod, it's also stable. But when connecting to a player through the mod, it says: on my end, that the IP address wasn't found, and on the opponents' end, it shows an "unknown error." I opened a bunch of different ports in the router, but it didn't help.

UPDATE: The problem was solved by creating a shortcut in the launcher, so I won't delete the message, in case it helps someone.