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I have a sharepoint 2010 site with two vanity URLs and

On the site i have a calendar with overlays to make things all colorful. When i access the calendar by overlays show up fine.

However....if i access the calendar by the overlays are gone and there is a little error at the top saying "Unable to find specified web in the given URL - . I don't understand why since it is the same sharepoint site. I did read that this might be an issue with calendar overlays but i'm not sure how to handle it....Any help?

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up vote 2 down vote accepted

You need to define as the primary URL for one of the other zones for that web application in Alternate Access Mappings. It sounds like is currently listed (if at all) as an AAM for

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