Michael Humphrey has published on his blog an article that raises the existence of a bug in the Web Availability Templates.
He has set up an availability monitor to query msn, bing, premier.microsoft.com, and technet. He has intentionally put in a mistyped URL, www.msn.cop. Alert is well raised for this inaccessible URL. Then he fixed the typo replacing www.msn.cop by www.msn.com and it's seems that this update is not taken in account even if you force the monitor to an healthy state. Monitor return back to unhealthy with the old URL.
The workaround is make your changes, then export the MP, delete the MP and reimport it. But this action of deleting, then importing a large MP (that was monitoring 40 URL) caused the OpsDB and DW to fall behind for about 30 minutes...
Read the article here : http://www.opsmanfan.com/index.php/7-a-bug-in-the-scom-2012-web-availability-templates
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