KB967831 patch will try to update OCS and afterwards will try to start RtcQmsAgent (aka Monitoring Agent) If you dont use or configure this service it will never start, causing the rollback of the patch and with it the failure of the frontend service.
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Here’s how to update the external address book url: Lcscmd /web /action:updatepoolurls /externalwebfqdn:<WebfarmFQDN> /poolname:<poolname more info: http://technet.microsoft.com/en-us/library/bb803611.aspx
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