[NAME], Did you check what the error asks for - "Please add it to DNS or the hosts file " ? Please start here and let us know the outcome.
Hi All, I have 8 DAG Node, 4 each for PROD and 4 for DR The Prod DAG Node have been install with NMM and NW Client. 18.1 , none on DR.   I noticed the following  while creating the Exchange Client , 1. While selecting the Preferred Server List, I will see all 8 available server for Federated Backup. 2. I only selected the servers within the PROD site and after the summary is over, during the creation, this error occur "DR01 is not a know host or trusted domain. Networker cannot validate the identity of these users "   Since I suspect I need to install NMM and NW Client at the DR, I proceed to test install on a DR01.   After installation, I recreate the Client and the same error reoccur.  After a few retries, going back and create,  the error start with DR1, becomes DR2, DR3 and lastly DR4 before ended up with this error instead " Adding New Client - Successfully added new Client PROD01 Create Other client - Operation Failed - Name DR1 is not a valid host name as it cannot be resolved in DNS . Please add it to DNS or the hosts file and flush the networker server DNS cache.   ( dbgcommand -p FlushDnsCache )  Undoing any previous Operations - Rolling Back Adding new Client "PROD1" - Successfully rolled back client "PROD1"   Thank you in advance!
Error while creating Exchange Node client. Networker Exchange 2016 IP-Less , NW 
18.1