Strange trouble with clamd/greylist/mimedefang

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	Hello,

I use two UltraSparc workstations, the first one is an U80 named kant (4*UII@450), the other one is an U60 named rayleigh (2*UII@450). kant is a MX1 mail server that runs on debian testing sendmail, milter-greylist, mimedefang with spamassassin and clamd. rayleigh is MX2.

On rayleigh, clamd and milter-greylist work fine. Some clamd process and milter-greylist run at the same time, and this MX2 work.

rayleigh:[~] > ps auwx | grep milter
bertrand  3803  0.0  0.0   3520   976 pts/3    S+   19:36   0:00 grep milter
root 23781 0.0 2.4 52144 24872 ? Ss Jun08 0:00 /usr/local/bin/milter-greylist -P /var/run/greylist.pid -u root -p /var/run/milter-greylist/greylist.sock root 23782 0.0 2.4 52144 24872 ? S Jun08 0:00 /usr/local/bin/milter-greylist -P /var/run/greylist.pid -u root -p /var/run/milter-greylist/greylist.sock root 23783 0.0 2.4 52144 24872 ? S Jun08 0:51 /usr/local/bin/milter-greylist -P /var/run/greylist.pid -u root -p /var/run/milter-greylist/greylist.sock root 23784 0.0 2.4 52144 24872 ? S Jun08 0:00 /usr/local/bin/milter-greylist -P /var/run/greylist.pid -u root -p /var/run/milter-greylist/greylist.sock root 23785 0.0 2.4 52144 24872 ? S Jun08 0:00 /usr/local/bin/milter-greylist -P /var/run/greylist.pid -u root -p /var/run/milter-greylist/greylist.sock
rayleigh:[~] > ps auwx | grep clamd
bertrand  3824  0.0  0.0   3520   976 pts/3    S+   19:37   0:00 grep clamd
clamav 25331 1.0 7.6 86896 79376 ? Ss 15:19 2:39 /usr/sbin/clamd clamav 26113 0.0 7.6 86896 79376 ? S 15:34 0:00 /usr/sbin/clamd
rayleigh:[~] >

With exactly the _same_ configuration, only one milter-greylist and one clamd process run on kant !

kant:[~] > ps auwx | grep milter
root 9973 0.0 0.1 69968 2600 ? Ssl 19:16 0:00 /usr/local/bin/milter-greylist -P /var/run/greylist.pid -u root -p /var/run/milter-greylist/greylist.sock
bertrand 12436  0.0  0.0   3800  1024 pts/1    S+   19:37   0:00 grep milter
kant:[~] > ps auwx | grep clamd
clamav 5639 2.9 2.0 65936 42448 ? Ssl 19:06 0:55 /usr/sbin/clamd
bertrand 12467  0.0  0.0   3800  1024 pts/1    S+   19:37   0:00 grep clamd
kant:[~] >

Some inbound mails are refused by kant (because clamd cannot scan all inbound mails). They remain in sendmail DATA stage and SMTP transaction aborts due to a timeout. I don't understand why with the same configuration, MX1 does not works. I'm sure that clamd works fine on rayleigh, but I'm not sure that it correctly works on kant. I don't see any information on the logs and all sockets and permissions have been verified. If I remove clamd support from mimedefang, kant works fine. I don't understant why only one clamd process can run on kant.

	Kernel is 2.6.20.11 (with netfilter ROUTE patch) from kernel.org.

Both run debian/testing. Kant is up to date. Last upgrade was made on rayleigh 8 days ago.

	Any idea ?

	Regards,

	JKB
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