Hello Watoan, I run into the same problem, I don't see an option on the GUI to remove the staging server either so I had to do this - hope it helps you too:
Make a backup and remove the old configuration file - Issabel will recreate it:
/etc/letsencrypt/renewal/YOUR_DOMAIN_NAME.conf
Empty this file: vim /etc/letsencrypt/values
> /etc/letsencrypt/values
Then coment out the following on this file:
vim /etc/httpd/conf.d/ssl.conf
#SSLCertificateFile /etc/letsencrypt/live/YOUR_DOMAIN_NAME/cert.pem
#SSLCertificateKeyFile /etc/letsencrypt/live/YOUR_DOMAIN_NAME/privkey.pem
#SSLCertificateChainFile /etc/letsencrypt/live/YOUR_DOMAIN_NAME/chain.pem
and add the default lines that Issabel is running over:
SSLCertificateFile /etc/pki/tls/certs/localhost.crt
SSLCertificateKeyFile /etc/pki/tls/private/localhost.key
Then remove the staging certificates present on the server:
rm -rf /etc/letsencrypt/live/*
rm -rf /etc/letsencrypt/archive/*
Then reboot and start again, make sure not to check the box for staging this time.
It worked for me, hope it works for you too.
