I have the same problem. I can’t get into plugins or updates. Both throw out a server error. Can overwrite be done manually without overwriting other site data?
Does this happen in incognito window? If you have deleted plugin and changed htaccess, it’s probably not the plugin.
Look at the admin settings > general / reading redirects.
I set a redirect on my multisite installation from mydomain.com to temporarydomain.com, but the result is redirecting from mydomain.com to mydomain.com/login.
Please advise.
