Hi Kym,
(But different Brett!)
Thanks for the tip about putting a pause into helo.cfm. How did you ever
discover that?
Cheers,
Brett
B)
Kym Kovan wrote:
Hello Brett,
We are running 2.5.10 on our production box so we are in the same space
but I suspect that the problem is not related to the version of iMS.
BS wrote:
We have started receiving the following message in our SMTP logs about
all
of the threads being used up by iMS. iMS never seems to ever recover the
threads. So we get this message repeatedly until the Connector fails and
then all iMS functionality is lost.
11/02/2006 02:56:42 PM [1025] WARNING: Server too busy - 60 active
threads
You are getting connections coming in faster than you are processing but
the "why" of that could be interesting. We see it occur several times a
day and as often or not it is a DOS attack that is quite deliberate or
an accidental one where a badly configured SPAM engine is just dumping
stuff at you too fast. In a lot of cases it won't recover the thread
until the connection timeout occurs as the connection is still
there,just doing nothing. The server has replied "too busy" but if the
connection does not get dropped then you have to wait the ten minutes
default or whatever the timeout is set to. You need to balance the
number of SMPT threads against the number of CF threads so that CF can
keep up with the workload. That includes whatever you are using for
SPAM/Virus detection as the thread does not get closed until the data
template has run.
The only way to get things back quickly is to restart the SMTP service,
this will drop all connections and start over but it is a tad drastic to
say the least! :-) We run a detection script that checks the threads
and if everything else has failed then it does a restart of the service.
You need to set thresholds so it only happens as a last resort. The best
technique is to make sure that CF is processing fast enough, run it as
hard as you can, and do lots of code tricks to keep the CF workload
down. One little trick is to use a pause in the helo.cfm template so
that the "accept" is not fed back for a couple of seconds. Bad SPAM
engines have given up by then and gone away whereas a legitimate server
will wait that long. This stops then hammering you with a bunch of
emails in one go.
HTH
Kym K
--
Brett Payne-Rhodes
Eaglehawk Computing
t: +61 (0)8 9371-0471
f: +61 (0)8 9371-0470
m: +61 (0)414 371 047
e: [EMAIL PROTECTED]
w: www.ehc.net.au
w: www.yoursite.net.au
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