Slow response -logs
Jonathan at XC.Org
Thu Jan 15 17:35:07 EST 2004
On 15 Jan 2004, Troy McKinnon writes:
> I also notice that telneting to port 25 is VERY SLOW.
> Does this mean it is more likely a postfix issue vs cyrus etc?
> Anything else I can do to help narrow down and locate the bottleneck?
Delays of about a minute traditionally mean you have a DNS resolution
problem, possibly for localhost or for the server's 'real' hostname.
Can you do
at a shell prompt on your server and get rapid results? If DNS is the
problem, you would see a big delay whle the system tries and fails to
do the DNS lookups of localhost and the host name.
As further confirmation, check that
telnet 127.0.0.1 1
is quickly rejected, but
telnet localhost 1
telnet `hostname` 1
get delayed, and then rejected. That would pretty much confirm it is
a DNS-related issue.
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