After upgrading to version 1.12.0 on my computer, I can't play multiplayer games via LAN and Xbox Live, and the network adapter settings are fine. When I enter the world, a message appears "Unable to connect the world.". Interestingly, in the version for mobile devices (former Pocket Edition) there is no such problem, which indicates an obvious bug.
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I'm having the exact same issue. Any workarounds yet?

After updating Minecraft to 1.12 on Android and iOS me and my friends can't connect to each other via Internet using manually added external server addresses. We get the same message as the report creator. Our port forwarding configuration (UDP 19132) hasn't been changed.

I have encountered this same issue when hosting a game on Windows 10 and trying to connect to it from a Switch.

Thats is were you are wrong. Im on mobile and i cant join any multiplayer game (realms and servers)

@Rayan Carvalho Fhoula I don't have problems on mobile

Thank you for your report!
We're actually already tracking this issue in MCPE-36190, so I've resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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>>I can't play multiplayer games via LAN on Apple devices either after the 1.12 update (????) .. exact same message ...