asterisk.ru

I hope the moderators will forgive this necro post, my 1st post here no less . I do it in order to save other surfers the time I spent on the same issue.
After comparing line by line the instructions referred to by the OP, I found only one slight difference in one command. And that did not solve the problem. In fact, the instructions are so identical to the commands in ast_tls_cert that it appears one or the other referenced each other.
What did make a difference was ownership of the keys. It's not really discussed, but probably most, including myself, generate them as root user. But on my system at least, asterisk runs as user asterisk. So I got that error as it couldn't access the keys owned by root. After changing ownership to asterisk it works just as the wiki says. Incidentally, I left /etc/asterisk/keys owned as root, it didn't seem to care about that.