I have Apache/2.4.41 installed on Ubuntu 20.04 LTS. This is on a cloud VM.

The server has PHP 7.4, and PHP 7.3 installed. Phyton was deleted completely by mistake and then installed back. Then, I tried to recover as many libraries as possible. Not sure if there are still some missing.

I installed an SSL certificate from let'sencrypt. Since the installation, I've been having trouble accessing the site. Sometimes the browser says the site is unreachable. To fix it, I have to ssh the server and restart apache by using sudo service apache2 restart. After that, the site becomes reachable again.

sudo apache2ctl configtest

Syntax OK

What can be wrong with it? I don't want to lose my configutation files in case I have to reinstall apache2. It seems that I have to restart apache2 every day.

After trying solution from @Matigo, cleared error.log, and restarted apache2:

cat /var/log/apache2/error.log

[Sun Mar 07 22:38:42.177067 2021] [mpm_prefork:notice] [pid 1566] AH00169: caught SIGTERM, shutting down

[Sun Mar 07 22:38:42.264574 2021] [mpm_prefork:notice] [pid 9359] AH00163: Apache/2.4.41 (Ubuntu) OpenSSL/1.1.1j configured -- resuming normal operations

[Sun Mar 07 22:38:42.264636 2021] [core:notice] [pid 9359] AH00094: Command line: '/usr/sbin/apache2'

sudo systemctl status apache2

● apache2.service - The Apache HTTP Server

     Loaded: loaded (/lib/systemd/system/apache2.service; enabled; vendor preset: enabled)

     Active: failed (Result: exit-code) since Mon 2021-03-08 23:25:02 UTC; 14h ago

       Docs: https://httpd.apache.org/docs/2.4/

    Process: 9348 ExecStart=/usr/sbin/apachectl start (code=exited, status=0/SUCCESS)

   Main PID: 9359 (code=exited, status=1/FAILURE)



Mar 07 22:38:42 bhub systemd[1]: Starting The Apache HTTP Server...

Mar 07 22:38:42 bhub systemd[1]: Started The Apache HTTP Server.

Mar 08 23:25:02 bhub systemd[1]: apache2.service: Main process exited, code=exited, status=1/FAILURE

Mar 08 23:25:02 bhub systemd[1]: apache2.service: Failed with result 'exit-code'.