What is the URL of the site with the problem?
Have you checked out the Create a Network documentation for sub-domains and the Softaculous section?
the reason I want to install a subdomain is to install the main-wp plugin there and then monitor/backup/update all my other sites and client sites from there. but maybe there is a better option?
That should work. Have you solved the login problem?
my hosting support guys are looking at it now, hopefully they’ll solve it soon
Excellent, please let us know what it was!
they managed to log in and told me I was using the username wrong!?!? I don’t know what that means but anyway afterwards I was able to log in. I installed the MainWP plugin and played around a little and left it to finish the setup later. but today I can’t open the subdomain (neither the login page nor the frontend interface). I get “this page is not available”
I opened another ticket with the support, let’s see if they can fix it
Yeah, what username you use shouldn’t have anything to do with whether or not a subdomain exists.
Hopefully they can figure this out for you.