I am using A8.03 and when a client joins a game the on_server function will sometimes trigger twice. The num_clients also goes up by 2 when it should only be going up by one.

When this client leaves, the num_clients just goes down by one.

Everything else seems to work fine. I am only calling session_connect once. As you can imagine, the num_clients builds up to large amounts over time.

I've had similar problems with A7.77 about two years ago.
http://www.opserver.de/ubb7/ubbthreads.p...true#Post283870

The first bug (1.) that happened when clients were dropped due to bad connections was apparent fixed.

The bug I mentioned in my last post looks similar to your problem, but it doesn't seem to be the exactly the same.
I don't think there has been a major project which has been using the internal multiplayer ever since, so there's a chance our two bugs have a similar cause.
It was the reason for me to switch to Anet however.

Perhaps they are connected. However, in my case they never trigger a leave twice. Just the on_server event_join is triggered twice randomly. So I could end up "2" or much more in the num_clients feild once everyone leaves but the server.

It also only seems to happen if I join a game, then leave it, and join it again. Doesn't ever seem to happen on the initial join sequence.

I'm using a solid workaround in the meantime. In the on_server function, I just take the id of the incoming client, and place it in one of 12 variables. Then I check when more clients join to make sure that it only writes into one variable, and it hasn't already be recorded. Then I take this number as the real amount of clients. It works really well.

I confirm this bug. It can happen when clients connect and disconnect several times. This will be fixed in the next update.