Logging on is not such a problem as Firefox remembers the password and logs in automatically. Chrome & Edge required me to log in and claimed to have a null response, but the back button proved it had logged on.
Just returned to retry, and I can't even get my profile up. Like posting an answer it just moans about the server resetting the line or something like that.
I can't see why Kaspersky can't investigate for themselves, but I guess they don't want to register here. It'd be the easiest way to get first hand data though, instead of bothering the customer.