Centos – GlusterFS SSL not working

I have been trying for hours to get GlusterFS SSL workong on the management and I/O path to no avail, so I hope you can help me.

I have tried it the simple way:

openssl genrsa -out glusterfs.key 4096
openssl req -new -x509 -key glusterfs.key -subj "/CN=Anyone" -out glusterfs.pem

And then I concatenated the glusterfs.pem from all peers to glusterfs.ca and distributed glusterfs.ca to all nodes.
The following files exist:

/etc/ssl/glusterfs.key
/etc/ssl/glusterfs.pem
/etc/ssl/glusterfs.ca

I have created the file to enable SSL on the management path and restarted glusterd.

touch /var/lib/glusterd/secure-access
systemctl restart glusterd

My glusterd.log is now logging hundreds of entries (dozens per minute) showing an SSL error:

[2017-08-29 22:01:07.535725] E [socket.c:202:ssl_dump_error_stack] 0-socket.management:   error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number
[2017-08-29 22:01:07.535760] E [socket.c:2519:socket_poller] 0-socket.management: server setup failed

The same error occurs in the volume log when I try to enable SSL on the I/O path and the same error also occurs when I try a more complex way of creating my glusterfs.* files. Example:

openssl genrsa 4096 > glusterfs.ca.key
openssl req -sha1 -new -x509 -nodes -days 3650 -key glusterfs.ca.key > glusterfs.ca
openssl req -sha1 -newkey rsa:4096 -days 1825 -nodes -keyout glusterfs.key > glusterfs-req.pem
openssl rsa -in glusterfs.key -out glusterfs.key
openssl x509 -sha1 -req -in glusterfs-req.pem -days 1825  -CA glusterfs.ca -CAkey glusterfs.ca.key -set_serial 01 > glusterfs.pem
openssl verify -CAfile glusterfs.ca glusterfs.pem

But this results in the same error as shown above, no matter what CN etc. I set and no matter whether I set the same or different CN on the peers.

I have also tried creating RSA keys with a key length of 2048 to no avail.

I am running out of ideas and I don't know what this error means in the context of GlusterFS:

SSL3_GET_RECORD:wrong version number

Disclaimer:
I am running CentOS 7 64-bit and GlusterFS 3.11.3 (latest version as of this writing).