Apache access log and server outages

apache-2.2logging

I've happened accross a odd issue this morning and I'm not sure where to go from here.

We use a couple of site up time monitoring services (pingdom, siteuptime) that essentially ping our server to check that its 'up'. Over the weekend both of these tools reported fairly large periods of outages.

Having looked through the Apache Access log for the reported down times I can see the requests coming in from both of these services. There are no errors reported in the error log against these times so I can only assume that the request was served as per normal.

I have already checked with our server hosts and they confirm that they had no downtime.

Is there such a thing as a sent log that details the actual pages that Apache has served?
Can you think of any other avenues that I can check to see where this problem may have come from?

Many thanks

Rob

[EDIT] Extract from access_log

85.17.156.11 – – [12/May/2012:17:31:00 +0100] "GET / HTTP/1.0" 200 12056 "-" "Pingdom.com_bot_version_1.4_(http://www.pingdom.com/)"

Best Answer

there is a field on pingdom with the details of the previous error;

pingdom

you can get the content of the error message;

enter image description here

that should give you a clue as to whether the requests are 4xx/5xx errors, or whether it was some network problem for your ISP or Hosting company

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