Hi  @Theedoek 

@Julian2111 

 Thanks for posting here.

ipconfig/all, what's the DNS server address? Is it the LAN interface IP? Or a public IP? Could you please share a screenshot?

To understand the situation better, please also share a screenshot of the LAN DNS settings page. Thanks.

  @Vincent-TP Local IP adresses
VLAN1: 172.16.250.0 /24 [Gateway+DNS Server IP is 172.16.250.1]
VLAN2: 172.16.55.0/25 [Gateway+DNS Server IP is 172.16.55.1]

That is the screenshot of the non working Lan-DNS thinggy

The device is resolve it to is in the "main network", I tested it right now on my phone and laptop, on the IoT network I always get my public IP back (because the domain I use is resolved from external to my ip), instead of 172.16.250.4, in the 172.16.250.0/24 network I get 172.16.250.4

  @Vincent-TP I don't understand what you mean by a screenshot of it, do you mean with all Lan-DNS domains set up? If so I would like to share it as a private message since it is a domain that is publically reachable as well. 

And here are the screenshots of ipconfig /all

@Vincent-TP 

Private LAN (default VLAN 1): 10.0.0.0/24

Router IP: 10.0.0.1

A wired computer in the private LAN:

As shown above the DHCP server, gateway and DNS server are all pointing to 10.0.0.1 which is the IP of my ER707-M2 router:

Domain 1:

Domain 2:

There are no issues reaching IP 10.0.0.2:

I sometimes get this error after a couple of seconds:

Clicking on "View Configuration Result" brings me to the logs and shows this:

  @Theedoek 

@Julian2111 

Thank you so much for taking the time to post the issue on the TP-Link community!
To better assist you, I've escalated your case to our support engineer to look into the issue. 

Please check your email inbox and ensure the support email is well-received.

Once the issue is addressed or resolved, please update this topic thread with your solution to help others who may encounter the same problem as you did.
Many thanks for your excellent cooperation and patience!

@Vincent-TP Thank you for escalating the topic to the engineering team. I have not received an e-mail yet, but I will surely keep an eye out.

I will provide updates in this topic once there is progress.