Please click on Solution, as you’re the creator of this post…
It can help others in future, as AD and Multisite is an issue a lot of people have…
Thank you!
My 2 cents
Andy
SOLUTION:
Add remote customer network lan in “Trusted Networks” on firewall and nethserver ad (if the AD is on another nethserver machine).
Add a dns record like this on both sides:
ad.domainname.tld > ip adress nethserver AD
Step for Join into domain on client windows:
Configure network card with only primary DNS with the Ip adress nethserver AD and use “ad.domainname.tld” to join and not use Netbios name
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