creation of ssl-parameters fails

[Kai Schaetzl]

Well, on that machine it took now more than an hour. But it created the 
same 769 bytes file as on the other machines. And, foreseeable, that one 
fails to transform as well.

-rw-r--r--  1 root root  360 Aug  7  2017 ssl-parameters.dat
-rw-r--r--  1 root root  769 Aug 19 19:25 ssl-parameters.new.dat

I cannot remember how I created the first one, I don't seem to have a 
record about that. Google says that dovecot would create the ssl-
parameters.dat file by itself on first startup. Does or did it do that?
If so, then it uses a different creation process. On that machine I had 
the default dovecot installed and running before going to 2.3. On the new 
machines I jumped right to 2.3 without ever running 2.2. Maybe 2.3 is not 
creating this file?

Kai