Troubleshoot: Server IP address could not be found

I had a client ticket today, with the following screenshot:

The error says, ‘server IP address could not be found’. This type of error means there is a DNS resolution error. There could be 3 possibilities:

1. Client hasn’t updated the dns nameservers for the domain
2. Host’s DNS server is down.
3. Client’s DNS resolver isn’t working.

To check if the client has updated the proper dns nameservers, you can use intodns.com. It will also tell you if the host DNS is down or not. If both are ok, you should check if you are able to load other domains using your Internet, if not, it has things to do with the local DNS resolver of your desktop or the ISP. In my case, it was client who failed to update the nameservers of the domain. All that was required to update the nameservers with the server ones.