Websites with prefix other than www do not resolve

On a domain, we have a few end users that are experiencing issues with sites loading that begin with a prefix other than www. For example, global.xxxxxx.com and iscm.xxxxxx.com. We experienced this issue about a month ago and it seemed to resolve on its own.  ipconfig /flushdns && ipconfig /registerdns does not work.  TIA for any help on this issue!

Submitted May 16, 2018 at 09:51PM by mlwellnitz https://ift.tt/2GmtUHP