Error: 'Name server already exists' – Unable to add DNS servers in NetScaler

To resolve this issue:

  1. Check if you have DNS Load Balance Virtual Server already added on NetScaler or not.

  2. If yes, we need to remove DNS Load Balance Virtual Server and respective services.

  3. Try to add the nameserver again, you should be able to add it.

  4. On NetScaler we can add either dns nameserver or DNS LB VIP for same DNS server.

  5. You can traverse to System > Networks > IPs and check is there’s a VIP already existing with this IP.

Best way is to run, “sh run | grep <IP Address>” from CLI to find any matching configuration.

If that doesn’t work try warm restarting the NetScaler.

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