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Failover Cluster Manager Domain Controller error Server 2016 in AWS

Hello Ee,

I have 3 sql 2016 enterprise servers in AWS running on 3 windows 2016 server instances. I wish to add these 3 as a cluster however , when I check the nodes in the cluster validation I receive " connectivity to a writable domain controller from node ' sqlnode1.somedomain.ca' could not be determined because of this error : Could not get domain controller name from machine ' sqlnode1.somedomain.ca' .

I am however able to disjoin/join the server to the domain ok on each of the 3 nodes and able to run "nltest /dsgetdc:somedomain.ca" and nltest /dclist:somedomain.ca ok on each of the 3 sql boxes and all domin controllers returned from nltest have the following flags :  GC DS LDAP KDC TIMESERV WRITABLE DNS_DC DNS_DOMAIN DNS_FOREST CLOSE_SITE FULL_SECRET WS . The domain Controllers are 2008 R2 and all 3 server 2016 boxes are on their own subnet as per aws instrucitons.

Please provide some guidance on this matter.
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lapatiya

can you give us insight into your IP configuration in win 2008 DC and in 3 SQL and Win 2016 boxes?
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sql servers, 172.16.40.41  ' sqlnode1.somedomain.ca'  , 172.16.90.42 ' sqlnode2.somedomain.ca' , 172.16.100.42 ' sqlnode3.somedomain.ca' . Domain controller is 172.16.10.10 .
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