Is portreserve installed and doing things?
I had the opposite problem with Centos 6.7 dovecot was grabbing the port when I didn't want it to
From my DIY notes
To cure the /etc/portreserve/dovecot problem on maui the immutable bit has been set on an empty file chattr +i /etc/portreserve/dovecot
On Thu, 2016-02-11 at 10:16 -0500, Tom Horsley wrote:
On Thu, 11 Feb 2016 22:05:32 +0800 Ed Greshko wrote:
If you are certain the problem arose after the most recent update then the logical thing to do is list what was updated.
I'm not certain of anything any more :-).
I rebooted twice after the update and dovecot failed each time, so it seemed to be reproducible, but then I added a "netstat -n -l -p" command to dovecot's "pre start" script so I could see who has port 993 tied up when dovecot starts, and it has worked perfectly after the reboots I tried with the modified the script.
I haven't yet tried putting back the original script to see if it starts failing again because I'm tired of rebooting :-).