Do you have a Windows based server?
If positive, maybe you have a problem with OpenSSL. This has some known troubles with Windows, and doesn't generate a key.
I suffered that in my tryal server, so I had to make all my tryals in our production server, wich is based in Debian. I'm sorry I can't help much with this, but I couldn't fix it in my own server :P
Moodle networking (MNet)
Help, please
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