IIS Admin Service failed to start with 'Class not registered' error

This article is contributed. See the original author and article here.

 

I came across a scenario where IIS admin was failing to start with error

 

 

0x80040154

-2147221164

REGDB_E_CLASSNOTREG

Class not registered

winerror.h

 

 

 

 

 

–Checked procmon which is a must go tool for  such issues

–tracing it , I could see below

1:46:11.7430366 PM      inetinfo.exe       9184       7516       RegOpenKey      HKCRCLSID{BA4E57F0-FAB6-11CF-9D1A-00AA00A70D51}                NAME NOT FOUND         Desired Access: Read      NT AUTHORITYSYSTEM 0

1:46:11.7431643 PM      inetinfo.exe       9184       7516       RegOpenKey      HKCRWOW6432NodeCLSID{BA4E57F0-FAB6-11CF-9D1A-00AA00A70D51}            NAME NOT FOUND         Desired Access: Read      NT AUTHORITYSYSTEM 0

1:46:11.7437105 PM      inetinfo.exe       9184       7516       RegOpenKey      HKCRCLSID{BA4E57F0-FAB6-11CF-9D1A-00AA00A70D51}                NAME NOT FOUND         Desired Access: Read      NT AUTHORITYSYSTEM 0

1:46:11.7438050 PM      inetinfo.exe       9184       7516       RegOpenKey      HKCRWOW6432NodeCLSID{BA4E57F0-FAB6-11CF-9D1A-00AA00A70D51}            NAME NOT FOUND         Desired Access: Read      NT AUTHORITYSYSTEM 0

1:53:01.7480590 PM      inetinfo.exe       9440       9812       RegOpenKey      HKCRCLSID{BA4E57F0-FAB6-11CF-9D1A-00AA00A70D51}                NAME NOT FOUND         Desired Access: Read      NT AUTHORITYSYSTEM 0

1:53:01.7481572 PM      inetinfo.exe       9440       9812       RegOpenKey      HKCRWOW6432NodeCLSID{BA4E57F0-FAB6-11CF-9D1A-00AA00A70D51}            NAME NOT FOUND         Desired Access: Read      NT AUTHORITYSYSTEM 0

1:53:01.7485668 PM      inetinfo.exe       9440       9812       RegOpenKey      HKCRCLSID{BA4E57F0-FAB6-11CF-9D1A-00AA00A70D51}                NAME NOT FOUND         Desired Access: Read      NT AUTHORITYSYSTEM 0

1:53:01.7486327 PM      inetinfo.exe       9440       9812       RegOpenKey      HKCRWOW6432NodeCLSID{BA4E57F0-FAB6-11CF-9D1A-00AA00A70D51}            NAME NOT FOUND         Desired Access: Read      NT AUTHORITYSYSTEM 0

 

this key HKEY_CLASSES_ROOTCLSID{BA4E57F0-FAB6-11cf-9D1A-00AA00A70D51}InprocServer32 has the value %windir%system32inetsrvmetadata.dll  which was missing

–I did  a test on my machine by deleting BA4E57F0-FAB6-11CF-9D1A-00AA00A70D51}      from HKCR node

–got the exact error

 

Such issues can come up after OS upgrade, while doing a registry restore/backup

 

 

 

 

 

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