Internet router preventing workstations talking to domain controller

[theboykidney]

Hi all,
If the internet router is on, it prevents the workstations talking to the DC, but only on login.
Switch it off, and everything works fine on login.
The workaround so far has been to switch it off when people are logging in, turn it back on afterwards, and then everything is as it should be.
The trouble only seems to occur when requesting to log in.
have switched all security features to off or lowest settings.
Workstations are win 10, DC is Win Server 2012 Standard, and the router is a ZTE model ZXHN H298A V1.0
Any suggestions welcome at this point.
Thanks.

 

[ss202sl]

Are your DC's providing DNS?

 

[Sam Poland]

Is DHCP turned on in the router? You can keep it that way you just need to point the Pri DNS setting to your server. And of course you should configure DNS in the server. The key is making sure your workstations first DNS server is your Windows server.

 

[t53186]

Do you have a managed switch or firewall? What roles are configured and running on the DC? Are the workstations TCP/IP properties set to configure to obtain an IP address automatically and obtain DNS server automatically?

 

[theboykidney]

DC is providing DNS
DHCP is off on the router
DC runs the only AD, DHCP and DNS.
Workstations obtain IP from DNS automatically.
Managed switch - PROCURVE J9028B

Thanks guys, appreciate the help. All out of ideas. Getting close to buying a new router and seeing if that fixes it :-/

 

[t53186]

Could you also post a screenshot of the ipconfig /all for one of the workstations.

 

[theboykidney]

Could you also post a screenshot of the ipconfig /all for one of the workstations.

Sure
edit - links are coming out a bit funny...
https://imgur.com/AwfYUgt
http://

 

[Sam Poland]

Your PRI DNS should be the same as your DHCP server since it also is hosting DNS.

 

[theboykidney]

Your PRI DNS should be the same as your DHCP server since it also is hosting DNS.

Thanks Sam, that sorted it. Means switching each machine from automatic DNS to manually inputting the specific DNS address on each machine.