What is the reason: once every other time it is impossible to enter the office?

Question

Digital certificates

Do I understand correctly that the problem with logging in is due to the lack of an ssl certificate, if the console gives only such a warning? The problem arose suddenly, there is no apparent reason. Will installing an ssl certificate help? Tell me who knows, please ...

Answer 1

No, you misunderstand.
And how is it manifested "time after time it is impossible to enter the office"? What's the error?

Answer 2

First of all, you still need to give a link and a demo password for tests... Otherwise, no one will help you.
And even then, in order to properly diagnose everything, we need full access to the system.
Your login form is self-written, so apparently they caught a glitch