SSL/HTTPS not working

We have a wildcard SSL certificate from GoDaddy which provides 3 .crt files for Tomcat version and 2 for Apache version (normal and bundle certificate). We followed the steps describen in the Admin Guide (, but SSL certificates still not been loaded properly.

Where tried converting SSL certificate to PKCS12 and importing it. Also, with an empty keystore, we converted PEM file to DER format but didn't work too.

Ports 8888 and 8443 are opened, but when you try to request a resource the server returns an empty response and browser displays an "ERR_EMPTY_RESPONSE" message.

What can we do to get SSL working properly or what are we doing wrong?

Thanks for your help