When you experience a DNS server error there are a few steps you can take to try and troubleshoot:

1. Check your internet connection – is your device connected correctly?
2. Try using a different browser to see if the problem persists.
3. Check your server settings – are your settings up to date?
4. If none of these work, it might be best to contact your internet service provider for further assistance.

If the above steps don’t resolve the issue, then you may need to contact your Internet Service Provider for further assistance.