You need to modify the
/opt/bitnami/apps/owncloud/conf/httpd-prefix.conf file to look like the one below
# App url moved to root
# DocumentRoot "/opt/bitnami/apps/owncloud/htdocs"
Alias /owncloud/ "/opt/bitnami/apps/owncloud/htdocs/"
Alias /owncloud "/opt/bitnami/apps/owncloud/htdocs"
As you can see, I commented out the `DocumentRoot` line and uncommented the `Alias` directives. After that, restarted Apache for changes to take effect and was able to access OwnCloud at `http://MYIP/owncloud`
sudo /opt/bitnami/ctlscript.sh restart apache
Apart from that, we have a guide to configure SSL with an AWS ELB load balancer. Can you check the link below in case it solves any issue?
Hope it helps,