As a "heads up" and to the casual future reader:

Copying to /etc/ssl/certs is a no-go for SLES12+ systems, these files will get deleted under certain conditions. Put your CA .pem files into /etc/pki/trust/anchors and run the command "update-ca-certificates".

For SLES11 (which this thread is about), ab's instructions are perfectly valid.

Regards,
J