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Background: Trying to chase a bug where resources occasionally won't load. Only happens on mobile devices.

Last five columns in IIS logs are cs(User-Agent) sc-status sc-substatus sc-win32-status time-taken

What I don't understand is we have entries like: {..user agent..} 590 0 0 15

If we map it, appears that some images return HTTP "590". Is there such a thing? I'm probably missing something here, any ideas?

Francis Nepomuceno
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  • User agent 590 is different from an http return code of 590. But, for what it's worth, the only 59x http codes I'm aware of are 598 and 599, `Network read timeout error (Unknown)` and `Network connect timeout error (Unknown)`, respectively. The fact that it only happens on mobile devices, and those error codes would make me suspect wireless connectivity issues, but that's all I've got. – HopelessN00b Dec 12 '12 at 14:42
  • Thanks for the info. It's not in the UA but in the sc-status column, which really bothers me because we all know there is no such kind of code. – Francis Nepomuceno Dec 12 '12 at 20:34

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Just found out that the server was configured with an error page which outputs this "custom" status code.

Francis Nepomuceno
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