[SOLVED] ISPConfig 3.1.7p1 - Lets Encrypt - SSL_ERROR_RX_RECORD_TOO_LONG

Hi, I am nearly desperate.
until yesterday, my server works fine. Since this day, I get this error, then i visit a webpage with a Lets Encrypt Certificate:
SSL_ERROR_RX_RECORD_TOO_LONG
I checked the logs. Nothing.
I did the LE Error FAQ https://www.howtoforge.com/community/threads/lets-encrypt-error-faq.74179/ - doesn't helped.
I uninstall a LE certificate manually with /opt/certbot/certbot-auto delete and reinstall the LE certificate with ISPconfig with no major errors. Also the Ceckbox with LE certificate is checked.
I uninstalled it again manually and installed it manually. This was the console output:

Code:

root@server1 /opt/certbot # /root/.local/share/letsencrypt/bin/letsencrypt certonly -n --text --agree-tos --expand --authenticator webroot --server https://acme-v01.api.letsencrypt.org/directory --rsa-key-size 4096 --email postmaster@kursiv.rgb24.de  --domains kursiv.rgb24.de --webroot-path /usr/local/ispconfig/interface/acme
You are running with an old copy of letsencrypt-auto that does not receive updates, and is less reliable than more recent versions. We recommend upgrading to the latest certbot-auto script, or using native OS packages.
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for kursiv.rgb24.de
Using the webroot path /usr/local/ispconfig/interface/acme for all unmatched domains.
Waiting for verification...
Cleaning up challenges
Unable to clean up challenge directory /usr/local/ispconfig/interface/acme/.well-known/acme-challenge

IMPORTANT NOTES:
- Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/kursiv.rgb24.de/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/kursiv.rgb24.de/privkey.pem
   Your cert will expire on 2018-01-21. To obtain a new or tweaked
   version of this certificate in the future, simply run
   letsencrypt-auto again. To non-interactively renew *all* of your
   certificates, run "letsencrypt-auto renew"
- If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le

Looks good so far.
The Server OS is Debian Jessie

 

the HTF Report is attached.

 

I found the solution.
I replaced the file /etc/apache2/sites-available/000-default-le-ssl.conf by an empty file.
Now it works again.

 

I actually run the certbot-auto in the shell.
Because I just wanted to update the script itself because I got warnings that the certbot-auto script is outdated.
But I alway cancel the certification. I used the certbot only for deleting certificates that I don't need anymore.