How to restore access to ISPmanager after installing an SSL certificate?

Question

PHP

What did I do?
1. I deleted the existing self-signed SSL certificate through ISPmanager.
2. Installed a freshly purchased certificate through ISPmanager.
What is the result?
1. HTTPS on the site works great.
2. Access to the ISPmaanger panel is gone. And if earlier the browser swore that it was not possible to verify the authenticity of the certificate, but skipped it, now it does not enter at all.
This is in all browsers:

Answer 1

killall -9 core