Can you test if the behavior is different if you use the default settings for the “Group discovery and activation for up to:” - this was 15 minutes if i remember it correctly.
This does not make any difference. Previously we used the default of 15 minutes. As we had the problem above we changed the settings to 1:1 to the settings of a working installation (and they use 2:15).
Only known difference to this installations are:
- other installation is an enterprise edition
- hosts of other installation are pingable