Apache went down and logged these errors in error log. The operating system was Solaris 10.
[Thu November 1 15:49:04 2009] [warn] (128)Network is unreachable: connect to listener on [::]:443
The solution is simple. Change this:
Listen 80
to
Listen 0.0.0.0:80
Similarly, if you have a Listen directive for the SSL port 443, change Listen 443 to Listen 0.0.0.0:443.
Restart Apache and you won't see these errors again hopefully.
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