Thank you for confirming.

The clint machines' process, that created temp table, has finished. As far as I know, it was the clean exit. The application does not delete the temp...

According to MS the table should be gone:

Global temporary tables are visible to any user and any connection after they are created, and are deleted when all users that are...

Yes, I ONLY have a problem for local connections.

I can't get the app ON THE LOCAL SQL server to run. Connections are dropped at random.

I tried with Shared Memory, then...