Something goes wrong when sendmail tries to resolve the nullclient relay-host and nss_ldap is used: The mail is not delivered to the relay-host (relay=[127.0.0.1] is logged!?).
If I change the /etc/nsswitch.conf line from hosts: files ldap dns back to hosts: files nis dns or put the relay-host in the files(/etc/hosts) sendmail has no more problems.
There is no different output from "getent hosts relay-host" whether nis or ldap is used.
Using FC2 and nscd(as there some more problems with ldap host resolving) for testing, I recognised that the machine stops for some time and a syslog message appears:
Jun 1 15:07:46 <host> kernel: Badness in interruptible_sleep_on at kernel/sched.c:1927
Finaly - after about 10 of these events - the host could not be handled remotely: You could type in commands but there was no asnwer!
Checking the central loghost, all hosts with FC2 installed have some of this messages ....
-- mfg Herbert Gasiorowski http://www.mathematik.uni-marburg.de/~gasi/
