UPDATED NOVEMBER 2nd: Another response from GOG saying they have reached out to Blizzard again:
I don’t have much new info, only that our Product Team contacted Blizzard and they will investigate.
I’m unable to provide an ETA for the fix.
I apologize for the inconvenience.
I asked GOG, they gave me a non-answer. They said to ask Blizzard, yet Blizzard does not have the option to run a traceroute with Diablo 1, it doesn’t list the IP address under classic games. Where is the Global Gateway for Diablo 1?
I have all the ports opened they insist is the problem, the game has been running fine for months. Ports 6112-6119 are OPEN.
Running Windows 10, have no upgraded anything, other people on the GOG forums are having the same issue with Diablo 1 saying battle.net is not responding after it says “checking versions” for about 1-2 minutes. Blizzard, can you please help?