@Cepheus0815 

Do you have a screenshot of the vlan configuration?

  @MR.S Thank you for the quick reply. Yes, please see:

  @Cepheus0815 

There is nothing wrong with your setup that I can see, do you have any other switches in the network that I can't see?

  @MR.S Nope. Everything is as you can see in the first screenshot (map). I am thinking that maybe, I need to connect the gateway to the IoT VLAN (not the default one, that is working perfectly fine). Can it be, that the tagged/untagged port settings need to be changed? Cheers, Rainer

  @Cepheus0815 

ok, i know what it is. you have easy managed switch. you need to create a switch profile and add this profile to all link ports

somthing like that

  @MR.S thanks again for your quick answer. Highly appreciated. Looks like I need to do some research, as I am not sure, what tagged and untagged network means. I still have some questions: 1) the profile your are suggesting, needs to be applied to all ports. As I have 3 VLANS (internal, IOT and guest), will this profile work for all three VLANs? 2) which network(s) needs to be in the tagged and which one(s) in untagged field? Thank you so much!

  @Cepheus0815 

set default as native and untagged rest of the vlan us tagged. apply to all switch port.

as i showed in the example

  @Cepheus0815