Re: Port 25 check cause of "Unable to open a socket to Sendmail" error?

[Tino Hendricks]

I think, this might only be the case if your postfix is configured to accept 
just one concurrent connection, i.e.

master.cf:
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (no)    (never) (100)
# ==========================================================================
smtp      inet  n       -       n       -       1       smtpd

What do the postfix Logs say?

Cheers!

Tino

> Am 11.04.2019 um 10:18 schrieb Jamie Burchell <address@hidden>:
> 
> Hi
>  
> Since configuring a check for Sendmail I’ve started seeing an error from our 
> CodeIgniter PHP application for the first time:
>  
> Exit status code: 75
> Unable to open a socket to Sendmail
> 
> The check is:
>  
> check process sendmail with pidfile /var/spool/postfix/pid/master.pid
> start program = "/bin/systemctl postfix start"
> stop program = "/bin/systemctl postfix stop"
> restart program = "/bin/systemctl postfix restart"
> if failed port 25 protocol smtp then restart
> if 3 restarts within 5 cycles then unmonitor
>  
> I’m assuming then, that the port is unavailable to other services that need 
> it if Monit is checking it?
>  
> TIA
> Jamie
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