Forbidden You don't have permission to access / on this serv

Hi, I have a problem and hope that the community in this forum can help me

I have installed OMV (latest version) and things have been working awesome for a couple weeks.
I don't know what I have done but I get this message when I try to access my OMV admin panel

403 Forbidden You don't have permission to access / on this server.

I have the web plugin installed and I can access the HTML site fine , its just the Admin page that I cannot get access to.
everything else seems to be working fine as well, FTP, SSH etc

I could and will most likely reinstall OMV again , but this would be the second time I would be doing that ( different issue) , and because everything else seems to be working fine I am wondering if there is another way to fix this

Thanks

Thank you , but it didn't work , so I tried omv-firstaid from command line and that doesn't do it.
Next I followed the link you advised and when I follow that, I access the page through HTTP rather than HTTPS , which seems to proof that what I followed was done correctly. However the page it drops me on is the same "403 Forbidden You don't have permission to access / on this server"

I am thinking whether it was something I did whilst playing with some settings in PHP.ini ,

is there anyway to reset this ? and remove the web plugin totally ?

Thank you , I think that's going to be the way to fix this a re-install

Can we do a re-install from command line , or is this only possible through the full CD re-install ?