Hi Daemien,
Exactly not sure if this will work but I would try this:
- Generate a self signed cert and key ( remove passphrase while creating this key )
- Put them inside /opt/gluu-server-3.x.x/etc/certs as 'httpd.crt' and 'http.key'
- Try to start Gluu server
- If it starts and if you can login:
- Grab your real key and cert ( remove passphrase from key this time )
- Follow doc on how to install apache cert.