On Feb 20, 2006, at 5:46 PM, Tab Trepagnier wrote:

...If I do a "ps -ef" on the server it shows the ISC processes
running:

Tab - That's a gross indication of existence, but in terms of
      provision of services, you need to look inside the process.
Use the 'lsof' command before and after the problem occurs, and
compare.  You should see an http service before.
Once the problem hits, look at any ISC-generated error log, and/or
look at your OS error log for indications of some failure.
These days, a "process" is a container for multiple threads: the
container may prevail, but a vital thread may have failed or
gotten blocked.

And you can always use Telnet to simulate an HTTP interaction to
ascertain health.  Practice before the problem to determine what
a good interaction looks like.

   Richard Sims