Error: “’ServerName’: Error during agent operation on server ‘ServerName’. No such host is known. Additional information: none.”

Windows Server
6.5 and older
https://kb.netwrix.com/1147
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Daily Change Summary contains the following error message: “<ServerName>: Error during agent operation on server <ServerName>. No such host is known. Additional information:  none.


1. Incorrect server names are specified.
2. DNS-request fails.

First of all, check that all server names are specified correctly in the program settings.
Make sure that your DNS server, has the DNS-records registered for your problematic servers:

  1. On the server running NetWrix Server Configuration Change Reporter, launch the nslookup tool: click Start / Run, type in nslookup.exe and press Enter.
  2. In the nslookup dialog, check all your problematic servers one by one: specify a server name and press Enter.
  3. If the IP-addresses appear in the command output, your DNS server has the DNS-records registered correctly.

If the DNS-records are not registered correctly, perform the steps below:

  1. On each problematic server, launch the command prompt: click Start / Run, type in cmd and press Enter.
  2. Type in the “ipconfig /registerdns” command and press Enter.
  3. As a result, the DNS records will be registered for your servers.
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