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Q: 

IIS7 log files reporting mass errors from weird user agent: Mozilla/4.0+(compatible;)

I'm getting a ton of weird log entries reporting:

cs-uri-stem: /ErrorInvalidURL.aspx (my custom 404 page)

cs-uri-query: aspxerrorpath=/Portals/0/Skins/MyCustomSkin/ErrorInvalidURL.aspx (seems to be coming from my skin folder)

I did some queries with LogParser and the majority of these errors are coming from the user agent: Mozilla/4.0+(compatible;) (that's it, odd short user agent, I know!)

All other instances of this error have "Gecko" in the user agent - Chrome (on windows xp-windows 7) and Safari.

Any idea what could be going on here? Why are these errors only showing up for that weird user agent and chrome/safari only?

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