The root cause of all this was that a problem with the connection between my main switch and the poe-ap-switch. I setup a LAG between them which does not work correctly (still isn't. But when I...

@Vincent-TP All switches are connected to the controller and stay. I can Upgrade them, reprovision etc. , though: I never tried to completly reset them and again adopt them. Resetting the AP and...

@Vincent-TP I disabled Windows Firewall. Does not help anything.

@Vincent-TP Controller gets an IP from the management network. It is on a router lan port with the following settings: The whole experience happens equally on different client workstations. There is...

@GRL Then web ui access is lost...

@Vincent-TP The APs get a ip from the management network (vlan=100, management vlan). The ports on which the APs a wired are configured with "All" Profile. There are only Omada components in the...