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Access Denied when crawling mysite / people on localhost with a different hostname

I have a clean install on the latest and greatest: Windows Server 2008, SQL Server 2008 and MOSS 2007 SP1 with all updates. This is the layout of my farm:

http://<server>:80 - Portal
http://<server>:8000 - Central Admin
http://<server>:8001 - SSP
http://mysite - MySites

Everything works fine, except the search crawl gave Access Denied errors on http://mysite and sps3://mysite. I checked everything, but could only find this in the Application event log:

The start address <http://mysite> cannot be crawled.
Context: Application 'SharedServices1', Catalog 'Portal_Content'
Details:
Access is denied. Check that the Default Content Access Account
has access to this content, or add a crawl rule to crawl this
content.   (0x80041205)

Also the Secutiry event log says:

An account failed to log on.
Subject:
Security ID:              NULL SID
Account Name:             -
Account Domain:           -
Logon ID:                 0x0
Logon Type:               3
Account For Which Logon Failed:
Security ID:              NULL SID
Account Name:             <DCA account>
Account Domain:           <Domain>
Failure Information:
Failure Reason:           An Error occured during Logon.
Status:                   0xc000006d
Sub Status:               0x0
Process Information:
Caller Process ID:        0x0
Caller Process Name:      -
Network Information:
Workstation Name:         <Server>
Source Network Address:   127.0.0.1
Source Port:              50678
Detailed Authentication Information:
Logon Process:
Authentication Package:   NTLM
Transited Services:       -
Package Name (NTLM only): -
Key Length:               0

I had a hard time finding the solution, until I encountered Ron Grzywacz's Blog: Crawling Issue with .NET 3.5 SP1.

Although KB896861 only mentions Windows XP and Windows Server 2003, it seems to fix the issue on Windows Server 2008 as well.

So to fix this:

  1. Click Start, click Run, type regedit, and then click OK
  2. In Registry Editor, locate and then click the following registry key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0
  3. Right-click MSV1_0, point to New, and then click Multi-String Value
  4. Type BackConnectionHostNames, and then press ENTER.
  5. Right-click BackConnectionHostNames, and then click Modify
  6. In the Value data box, type the host name or the host names for the sites that are on the local computer, and then click OK
  7. Quit the Registry Editor, and then restart the IISAdmin service

It worked immediately!