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Hello.

I'm having some kind of nightmare!
Today, my friend and I decided to play Heroes 6 online. It seemed
fine, we played, saved the game. In the evening, we decided
to continue. When I "created" the save in the evening, and he joined
my game, as you know, it was necessary to confirm
readiness. He clicked "Ready". I should have been able to
start the game, but:
But when I click "start game", I just get a
checkmark indicating readiness! The game doesn't start...

This is a normal bug. You need to wait for a while; repeatedly clicking "Ready" helped me.

Added 11 minutes later
Now, the glitches are affecting me too... Although I don't know what it is. I was told that someone here asked about this, but I couldn't find it using the search and keywords.
The problem is as follows:
I'll say right away that it used to work fine.
There are 4 friends that I sometimes play with (rarely :)), and we decided to get together...
I live on the 3rd floor, 1 friend lives on the 2nd floor of the same building, and another in the neighboring entrance. Another lives a few stops away. The one who lives closest has a D-Link 628 router. It's a regular router (again, I repeat, we've already played with it, and everything was fine).
We all have the same provider, and the 3 of us who live in the same building have the same subnet, and the one who lives a few stops away has a different subnet. We all have the same version from Buka.
The problem is this. When I create a map and he joins, both he and I get the error "connection timeout, check your internet connection". Okay, I think, it's nothing, it will pass, but no... after some troubleshooting, the problem remains. We decided to connect the person from the neighboring entrance, who is connected through the router on the 2nd floor of my building, and the same thing happens. Then we decided to connect the person with a completely different subnet, but the same provider, who also has a router. When connecting and creating a game with the person from the other subnet, it worked, but the other 2 from my building couldn't join. The same thing happened when they connected to him first, and then I couldn't join. Directly, without a router, everyone connects, but we need a router, so I don't know how to deal with this. Everything is configured correctly. If anyone has encountered this or knows what to do, I would be grateful.
P.S. I'm curious about this myself now! :)