SMS 2003 security templates, MP functionality

I was troubleshooting a problem with a MP today.  I ran the MP Troubleshooter - Pre-Install and everything applicable passed.  I had already installed SQL 2005 SP2 Standard, running under the context of a domain user account, sms_sql_user (nothing fancy, just a domain user).  I manually set both FQDN and NetBIOS SQL SPNs on the user account and all other MP prerequisites were met.  I installed the MP (on the site server) and there were no errors in the setup log.  Great, right?

I ran the MP Troubleshooter - Post-Install and there were two similar errors: "Failed to query web site: http:// sms2003:80/SMS_MP/.sms_aut?MPLIST (Exception: The remote server returned an error: (401) Unauthorized.)"

C:\Windows\System32\LogFiles\W3SVC1\ex070712.log contained multiple lines similar to the following:
2007-07-12 18:03:20 W3SVC1 GET /SMS_MP/.sms_aut MPCERT 80 - - 401 1 0

HTTP Error 401.1 - Unauthorized: Access is denied due to invalid credentials.

I was able to successfully query the SLP (e.g., http://sms2003/sms_slp/slp.dll?site&ad=Default-First-Site) so I knew IIS was functioning ok.

Manually attempting the MP query (e.g., http://sms2003/sms_mp/.sms_aut?MPLIST) returned the error: "Internet Explorer cannot download .sms_aut?MPLIST from localhost. Internet Explorer was not able to open this Internet site.  The requested site is either unavailable or cannot be found.  Please try again later."

I assumed it had something to do with the fact that SQL was running under the context of a domain user account and not the local system account, so that consumed most of my troubleshooting effort.  Just as I was ready to wipe and reload, it occurred to me that I was using the customer's server image which may have a security template applied.  Upon further investigation, it had a custom template based upon the high-security template.  D'oh!

I applied C:\Program Files\SMS 2003 Toolkit 2\Security Template\HighSecurity_SMSServer.inf and all was well.

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