We are not using windows for dns we are using dns on linux which i don't think is the issue but want to point out from the start
so on a member server i have wireshark installed and filtering on udp port 53
i then do a ipconfig /flushdns followed by a gpupdate
then i look at my wireshare capture first dns lookup is for my dc which returns the ip address of the dc which is fine
so DC1.Test.com 192.168.1.100
then next lookup is the issue the server then request _ldap._tcp._sitename.DC1.test.com
there is no record for this as the member server has appended the DC FQDN not the domain name there is a record for
_ldap._tcp_.sitename.test.com
the next lookup is then _ldap._tcp_.DC1.test.com Again no record
strange thing is if i stop the netlogon service on the member server it does not perform these lookups
and what is even stranger if i move the member server in ad to an ou with the same gpo applied the first time i run the test the server just quireis for the dc does the gpupdate with no other dns lookup
i then run the test straight after and the problem is back
i can figure out what is causing the machine to request these lookup is it even normal to request these records?
we have a windows dns server in a different domain i have checked this and it has none of these records
perform the same test on a memeber server in that domain and i never get the problem