I would like to enable OCSP stapling in my Apache server. I'm usingServer version: Apache/2.4.7 (Ubuntu)Let's Encrypt certificateI'm really inexperienced in this matter, so it might be a trivial issue.I added SSLUseStapling on to /etc/apache2/sites-available/default-ssl.conf.I then edited /etc/apache2/mods-available/ssl.conf, adding this line:SSLStaplingCache shmcb:/tmp/stapling_cache(128000)I read that this would be sufficient to enable OCSP stapling.I checked the syntax with sudo apachectl -t, and it was OK. However, upon reloading, Apache can't start. UPDATEFollowing this guideInside my SSL virtual Host (/etc/apache2/sites-available/default-ssl.conf) I added these lines below my sets SSLCertificateFile, SSLCertificateKeyFile:SSLUseStapling onSSLStaplingReturnResponderErrors offSSLStaplingResponderTimeout 5I then edited /etc/apache2/mods-available/ssl.conf, adding this line:SSLStaplingCache shmcb:${APACHE_RUN_DIR}/ssl_stapling_cache(128000)I can restart Apache without problems, however OCSP seems not workingopenssl s_client -connect www.example.com:443 -servername www.example.com -status < /dev/null> OCSP response: no response sentWhat am I doing wrong, is it something related to my Let's Encrypt certificate?
Let's encrypt - Apache - OCSP stapling
ssl;apache virtualhost;letsencrypt