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Server Crashes on Mysterious / Permission Change (mDNSResponder missing)
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Server Crashes on Mysterious / Permission Change (mDNSResponder missing)

I've had several occasions of flakey behavior, followed by re-boot, followed by inability to complete booting, with the following message scrolling endlessly:

(timestamp) dns com.apple.launchd[1] (com.apple.mDNSResponder[xxx]): posix_spawnp("/usr/sbin/mDNSResponder", . . .): No such file or directory

The first couple times, I re-installed, since I hadn't invested that much in getting going. But this time, I had switched users over -- it was either figure this out, or go back to Tiger.

The first symptom was IMAP quit working. Incoming mail was still coming in, but users couldn't access it via client mail readers. I had just set up webmail, using /etc/squirrelmail/config/conf.pl, although I can't really point the finger at that right now. I looked over cyrus logs and config files, and couldn't see anything unusual, and so I decided to re-boot. That's when I started to panic.

I booted into single user and verified that /usr/sbin/mDNSResponder did, in fact, exist. Then I started looking at permissions, first at the file, then at the enclosing directories. When I got to "ls - laod /", it said "drwxrwx---". Hmmm... no read or search permission for others on the directory root? I did "chmod 775 /", crossed my fingers, and pressed CTR-D to exit single user mode.

And everything is fine.

I know I didn't do this, so what did? Anyone else seen this problem? I hate to report a bug that I can't repeat, and I'm unwilling to try to repeat this particular one.


:::: Growth for the sake of growth is the ideology of the cancer cell. -- Edward Abbey ::::
:::: Jan Steinman, http://www.Bytesmiths.com/Gallery ::::


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