Hi @yairguy, it seems like your Apache server could is running.
Note that if you use the Bitnami HTTPS Configuration Tool or the generate_certificates.sh script, they take care for you of stopping Apache and starting it afterwards. They also configure your Apache server to use the new SSL certificates afterwards, so we recommend you to use any of these.
If you still want to keep using Lego without relying on any of those tool, you need to stop Apache:
sudo /opt/bitnami/ctlscript.sh stop apache
Then run Lego:
sudo /opt/bitnami/letsencrypt/lego --tls ...
After that you must configure the Apache certificates in
/opt/bitnami/apache2/conf/bitnami/bitnami.conf and point to the right certificates.
Finally, once that is done, you can start Apache:
sudo /opt/bitnami/ctlscript.sh start apache