TLS Error connection Error while reading file

[ipangsan]

Hi.
Greeting.

Before i post this issue, i`ve tried all best my knowledge. My server setup :
. Ubuntu 20.04 LTS
. Hestiacp 1.4.14
. Exim 4.93
. Dovecot 2.3.7.2

SSL Using Public SSL Wildcard. Configuration SSL Successful. and web server running.

incoming mail always late but outgoing always shown error but sent to the aim.

Exim error :

TLS error on connection from [xxx.xxx.xxx.xxx] (cert/key setup: cert={/usr/local/hestia
/ssl/certificate.crt} key={/usr/local/hestia/ssl/certificate.key}): Error while reading file.

Dovecot Error :

Disconnected (no auth attempts in 0 secs): user=<>, TLS handshaking: SSL_accept() failed: error:14094416:SSL routines:ssl3_read_bytes:sslv3 alert certificate unknown: SSL alert

Found this topic,

EXIM TLS Key not found

Hi All, I have an issue with hestiacp and exim when receiving mail. 2020-03-21 12:42:45 TLS error on connection from mail-pf1-f173.google.com[209.85.210.173] (cert/key setup: cert=/usr/local/hestia/ssl/certificate.crt key=/usr/local/hestia/ssl/certificate.key): Error while reading file. Some mail servers only use TLS so cannot receive mail from there. Found something from vestacp that this should be solved with: chmod 664 /etc/exim4/domains/$mydomain/aliases but did not help. So I know I…

But solution is using Letsencrypts.

I need to try without letsencrypt first because i`ve own Public SSL.

Sincerely