Action Microsoft.Crm.Setup.Server.AddServerAction failed. No host is known

We are configuring IFD load balancing CRM for a client. During installation for both front end and back end, installation we are getting stuck at below-mentioned error

Action Microsoft.Crm.Setup.Server.AddServerAction failed. No such host is known.

Installation logs for C:\Users\<username>\AppData\Roaming\Microsoft\MSCRM\Logs

crmserversetup

11:44:27| Info| InputResult: Retry
11:44:27| Info| CrmAction execution time; AddServerAction; 00:48:42.1625793
11:44:27| Error| System.Exception: Action Microsoft.Crm.Setup.Server.AddServerAction failed. ---> System.Net.Sockets.SocketException: No such host is known
at System.Net.Dns.InternalGetHostByAddress(IPAddress address, Boolean includeIPv6)
at System.Net.Dns.GetHostEntry(String hostNameOrAddress)
at Microsoft.Crm.Setup.Shared.ADUtility.GetLongMachineName(String machine)
at Microsoft.Crm.Setup.Shared.ConfigUtility.AddServer(String sqlServer, ServerRoles roles, ServerRoles roleExclusionMask, Boolean createDatabases)
at Microsoft.Crm.Setup.Shared.CrmAction.ExecuteAction(CrmAction action, IDictionary parameters, Boolean undo)
--- End of inner exception stack trace ---, Error, RetryCancel, Option1

Pressing retry is of no use.

Checked the db event viewer but could not find any suitable information. Also, an earlier forum (link) asked us to check OU "Needed to have organizational unit and security group creation permission in Active Directory." that as per client our user have it.