A few days ago I have done the latest updates to my openSUSE Tumbleweed server in which I run Nagios.
The updates finished without any error and from that time when I try to login to nagios, I see the login windows, I am using my credentials and the next screen is
Access forbidden! You don't have permission to access the requested directory. There is either no index document or the directory is read-protected. If you think this is a server error, please contact the webmaster. Error 403 Apache
apache and nagios services are enabled and started