Potential Rogue Plugin Preventing Multisite Admin Login

Hi All,

I have a multisite instance with some issues.
I believe I have an issue with a plugin preventing/causing login reauth redirects on the admin login page.

I have renamed the plugins folder to plugins.deactivate which allows me to login to the network dashboard.
Looking in the plugin menu at this point shows I have no installed plugins. Renaming the plugins directory back while I am still logged in, causes the same slow dashboard response as when logging in; thus preventing me from manually deselecting plugins in the standard way - in order to identify the misbehaving one.

How can I disable the plugins one by one in this scenario ?
Will individually renaming each of the directories directly under the main plugin directory work, and remove them from the dashboard menu list ?

Many Thanks in advance for clear concise advice on this one.