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We had some users complaining about a web service not responding periodically, so I took a look in my IIS logs, and found that periodically, there are time-gaps and a reprint of the header that coincide with the times that customers are saying that they see connection timeout errors.

Does anyone know if this is 'normal' or if it indicates a problem? If it indicates a problem, is there a means for diagnosis?

My log files look like (parts removed for readability):

2009-11-09 23:31:16 W3SVC713846796 SERVER 1.2.3.4 POST /page1.aspx - 443 - 1.2.3.4  ...
2009-11-09 23:31:18 W3SVC713846796 SERVER 1.2.3.4 GET /page2.aspx - 443 - 1.2.3.4 ...
#Software: Microsoft Internet Information Services 6.0
#Version: 1.0
#Date: 2009-11-09 23:55:48
#Fields: date time s-sitename s-computername s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs-version cs(User-Agent) cs(Referer) cs-host sc-status sc-substatus sc-win32-status sc-bytes cs-bytes time-taken 
2009-11-09 23:55:48 W3SVC713846796 SERVER 1.2.3.4 POST /page1.aspx - 443 - 1.2.3.4  ...
2009-11-09 23:55:48 W3SVC713846796 SERVER 1.2.3.4 POST /page2.aspx - 443 - 1.2.3.4  ...
...
...
2009-11-09 23:55:52 W3SVC713846796 SERVER 1.2.3.4 POST /page2.aspx - 443 - 1.2.3.4  ...
#Software: Microsoft Internet Information Services 6.0
#Version: 1.0
#Date: 2009-11-10 00:18:43
#Fields: date time s-sitename s-computername s-ip cs-method cs-uri-stem cs-uri-query s-port cs-username c-ip cs-version cs(User-Agent) cs(Referer) cs-host sc-status sc-substatus sc-win32-status sc-bytes cs-bytes time-taken 
2009-11-10 00:18:43 W3SVC713846796 SERVER 1.2.3.4 GET /page3.aspx - 443 - 1.2.3.4  ...

this is all within a single log file. It just seems to have large gaps of several minutes and a header reprint... any ideas?

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2 Answers

When you see the header repeated like this, it typically means IIS was restarted. Any Event Log entries?

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No there was nothing int he event logs. I'm thinking this is just normal IIS behavior though, becuase on further review, I get the same gaps and headers for all the sites in all the servers in the farm, and with gaps up to a few hrs at night. So i think it must just shut down the threads or something if idle for too long and reinitialize on a request. –  rally25rs Nov 11 '09 at 20:36
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up vote 1 down vote accepted

On further inspection, it seems that this is related to the worker process hitting its idle timeout and shutting down. On the next request, it starts back up and reprints a header in the log.

Configuring Worker Processes for Idle Timeout (MS TechNet)

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