http://blogs.technet.com/b/momteam/archive/2008/04/01/microsoft-it-s-opsmgr-2007-deployment-ms-and-gw.aspx

Troubleshooting OpsMgr 2007 and OpsMgr 2012 certificate issues with PowerShell

http://blogs.technet.com/b/momteam/archive/2013/09/17/troubleshooting-opsmgr-2007-and-opsmgr-2012-certificate-issues-with-powershell.aspx