I have a Ubuntu 20.04 install of open project in combination with a Apache virtual host setup. It worked fine for weeks but now when trying to access from the internet you get the 503 error, when trying to test through localhost on the ubuntu server itself you get the 403 error.

 sudo service openproject status says the server is active

the apache error log says:

[Thu Mar 24 23:57:40.053337 2022] [autoindex:error] [pid 4703] [client 64.31.49.110:45040] AH01276: Cannot serve directory /opt/openproject/public/: No matching DirectoryIndex (index.html,index.cgi,index.pl,index.php,index.xhtml,index.htm) found, and server-generated directory index forbidden by Options directive

I am not apache savvy enough to interpret the error log message and need help here.

Obviously this is not an open project problem but an Apache problem.

Thanks for your consideration.