I've encountered a problem in which sysklogd and diald are
hanging each other up.

I began with an install of Redhat 5.2.  I then brought it up
to date with the current patches.  Finally, I installed the
diald rpm from contrib at sunsite.  Version information is
as follows:

diald-0.16.4-1
sysklogd-1.3-26
kernel 2.0.36-3

When I boot the system, diald behaves as it should.  It
brings up the line when I ask for it, and takes it down a
few minutes later.  But after that, it stops working.  It
doesn't respond to requests anymore.  The interesting
thing is that if I restart sysklogd, the diald comes back to
life as soon as the restart takes place.

More interesting, and more likely related to a problem with
sysklogd, the system refuses to allow new logins to the
system until sysklogd is restarted, and halt and reboot will
not work, but Ctrl-Alt-Del will shut the system down-if I do
it twice.  Shutdown -n also works.

Now, for the more interesting part, I reinstalled sysklogd
again.  I used the same version, and didn't remove anything.
Now, the system appears to be functioning as it should.
Diald seems okay, as does sysklogd.