Pedro David Marco:
> Mar 13 08:32:23 serverA postfix/smtp[22279]: fatal: watchdog timeout
> ...
> Mar 13 11:32:35 serverA postfix/smtp[31458]: fatal: watchdog timeout
Wietse:
> Your Postfix SMTP clients are hanging (resulting in watchdog
> timeouts). Are you running in a VM, or some other hosting setup?
Pedro David Marco:
> no Wietse... i have studied the traffic with tcpdump and it does
> not seem a Postfix issue... i see lots of TCP retransmissions from
> postfix that do not have their correspioding ACK..
This may come as a surprise, but Postfix is designed to deal with
errors in TCP connections.
Specifically, Postfix uses poll() or select() to determine that a
TCP a send or receive operation is taking too much time.
On your system, these poll() or select() calls do not time out.
Maybe your system does not get the hardware resources to that are
needed to implement those time limits. That's why I asked if you
run Postfix in a VM or some other hosting setup.
The Postfix watchdog timer is a safety mechanism for kernels with
a broken implementation of poll() or select(). Postfix requires
that these functions work. You need to find out why they don't.
Wietse
