How to join a domain when using a RED device on remote office.

UTM network is 192.168.0.x, RED device is 172.16.16.x I can ping whole network but how do I join a domain on the remote side? I tried putting the DNS of the AD in the DHCP and that pushes through but it doesn't see the domain from here in terms of joining it through the FQDN.

  • Hello Arnold Fischer,

    Thank you for contacting the Sophos Community.

    This should be possible, what is the error you are getting when you try to Join to the domain?

    Are you using the RED in which mode? Split tunnel, full tunnel? 

    Are you using any Web Protection on the RED device? if so, can you try to remove the RED Subnet from the Web Protection.

    Is the 172.16.16.x/X in the Allowed Networks in DNS?


  • In reply to emmosophos:

    I just found the solution, I needed to add the DNS to the firewall rule. Thank you.