Thanks for the reply.
I had tried with a POST request but the result is the same.
I think the issue probably belongs to the second case, as I could login without problems until recently. However, there is one user for whom the login still works – and I don’t think I have activated him manually. Have I got the correct understanding that after automatic registration of users there is no need for separate user activation? Would it be possible that the offending plugin/recaptcha affects only the registration phase?
And how do you suggest that I find the offending plugin? By disabling all and then reenabling one by one?
