[Solved] HTTP Error 401 Unauthorized When Accessing Zimbra 8.8.9 Shared Calendar and Mailbox
Problem: HTTP Error 401 Unauthorized show on browser when try to access Zimbra 8.8.9 Shared Calendar and Mailbox. It’s most likely the browser either did not send another request with Authorization in
response to the 401, or had sent an Authorization which is not using GSS-API / SPNEGO scheme.
Solution 1: Make sure Browser is Supported
The following browsers are supported: Windows PC: Internet Explorer 6.0 or later, Firefox 3.0 or later, Chrome, Safari
Apple Mac computer: Safari
Solution 2: Configure Browser Settings
Originally published at pupuweb.com on October 1, 2018.