I just ran across this in my Native Mode ConfigMgr site hierarchy, where the MP at the Central Site had a number of these entries in the MPControl.log.  The problem turned out to be that the Web Server certificate was not binding to the website on the server (NMCM01.contoso.com).  It was “bound” before, so I’m not sure what why it was lost.  This is not the first time I’ve seen this behavior on Windows Server 2008 servers hosting secure IIS websites.

Once the Web Server certificate binding to the website was re-established, the error code 12030 entries in MPControl.log ceased.

The RED section below shows when the web server certificate was NOT binding to the web site.

The GREEN section shows the new entries in MPControl.log after fixing the binding issue on the website.

Read the complete post at http://www.1e.com/techblog/post/2009/07/24/MPControllog-and-error-code-12030.aspx