Thank you for your reply!
Actually I've already removed that file from the server. I used standalone version of certbot. And successfully download four files: cert.pem, chain.pem, fullchain.pem and privkey.pem. Then, I used the following code:
But face the same problem. I cannot login into administration console (port 4848). But with the different error:
SSLHandshakeException
At port 8181 ssl works perfectly.
Can you give me a clue of how to solve this problem?