Open Terminal and type sudo killall -HUP mDNSResponder . 6. If You Are the Website Owner
If you are already logged in, your "session token" might have expired or become corrupted. Log out of the site completely, then log back in to refresh your credentials. 4. Clear Your Browser Cache and Cookies How Do I Fix 401 Unauthorized Error?
Are you seeing this on a or while working on coding/API development ? Open Terminal and type sudo killall -HUP mDNSResponder