@ all The problem is the missing "all" Profiles for Easy-Managed Switches. We need to manually create port profles and apply them (to the uplink ports too).

I just came back from Site3... I tried a lot of different things to be sure and can tell it is a defective / incompatible NIC on the appliance. I tried different cables with strange results, I tried...

@Clive_A Thank you so much for your help!!! No, unfortunately I can't do anything "useful" with the machine. Besides setting air- and water temperatures, checking voltages and acknowledge error...

I created a new vlan 23 "management" and put the switch and AP there, a matching switch profile (Native 23 untagged 23, all others tagged), mapped that to the uplink ports (router and AP) and set...

@Clive_A The device @242 is an industry PC running an unknown Linux Distribution. It is the diagnostic interface for the building-management (heating, cooling, water, power of a large office...

Maybe that helps: Switch running config site 3, I just moved its management IF back to the default VLAN: !SG2210MP # vlan 152 # vlan 231 # vlan 241 # # # # # # # # # # # # # # # # # # # # # hostname...