Unreachable URL exception for ScriptResource.axd
With ASP.net and AJAX control toolkit used on your custom built website, the files ScriptResource.axd and WebResource.axd are auto-generated with each session on a browser. These keys are only valid for that perticuler session.
When Google crawlers visit a page during any session they also cache the session keys WebResource.axd and ScriptResource.axd. Because these keys are expired with its session Googlebots will not find them on its next crawl and will report the Unreachable URL 500 exception error for these files.
The best way around - Disallow in Robot.txt
Disallow: /WebResource.axd
Disallow: /ScriptResource.axd
or
Disallow: *.axd
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