OT: All processes of Sendmail stuck... DDOS?
ugob at camo-route.com
Mon Mar 20 10:30:23 GMT 2006
I used to have 30 sendmail processes max, but raised it to 100
yesterday because almost all of the 30 processes were "busy" waiting for
input from other servers. I also reduced the timeout value for the "TO"
command. 2 kind of entries show up in "ps aux | grep sendmail":
sendmail: server h090.n068.nhk.or.jp [220.127.116.11] cmd read
sendmail: server nat.resnet.mc.edu [18.104.22.168] startup
Most of our MX's are having this problem.
Using a mix of Greet pause, connexion throttling, greylisting, RBLs.
The number of connexions rejected by sendmail by these different
processes have known a very significant increase lately. Before
implementing Greylisting, MailScanner was processing ~ 100 000 msg/day
max on all of our servers. Now all the log entries for rejected
connexions by sendmail totals ~ 400 000/ day, and it doesn't look like
it si going to stop.
We are not getting complaints (yet), and the ressources seems to be able
to cope with the problem without significant problems.
Anyone experiencing the same thing? Any solution?
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