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Failing to detect redirect to 404 as dead ...
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Description

On https://en.wikipedia.org/w/index.php?title=ISO/IEC_8859-11&oldid=809626779, there is at least one link to http://msdn.microsoft.com/goglobal/cc305142.
Visiting that URL quickly reveals that it's not working -- it redirects to some other URL that does nothing useful -- and the status codes make this clear, to: the redirect target, https://docs.microsoft.com/en-us/globalization/unicode-code-point-info, correctly returns 404.
Checklinks https://dispenser.info.tm/~dispenser/cgi-bin/webchecklinks.py?page=ISO/IEC_8859-11 knows this, too, but IABot doesn't seem to notice at all :-(.

Event Timeline

Maybe this task has relation with the task that I recently opened (T183779). A dead link with a 404 error but not marked as dead link.

The bot has stopped checking anything on Microsoft as it has detected that Microsoft is blocking the bot from accessing their site for some reason. To prevent excessive false positives, the bot instead puts the entire domain in a Whitelist.