SQL Server Management Studio connection fails to COM errors


I have an instance of SQL Server 2008 running on a Windows 2008 server. I am able to connect to this SQL server from several machines on my network. However, I cannot connect using SQL Management Studio on the SQL Server itself.

When I hit "Connect" I get this error:

Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.VisualStudio.OLE.Interop.IServiceProvider'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{6D5140C1-7436-11CE-8034-00AA006009FA}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)). (Microsoft.VisualStudio.OLE.Interop)

Server config:

  • SQL Server 2005
  • Windows Server 2008 Std 32-bit
  • Also runs SQL Server 2000 on port 1444

I tried:

for %1 in (%windir%\system32*.dll) do regsvr32 /s %1

for %1 in (%windir%\system32*.ocx) do regsvr32 /s %1

  • Running regsvr32 actxprxy.dll, which produced an error

Any ideas?


asked on Server Fault May 21, 2009 by Justin • edited May 21, 2009 by Justin

2 Answers


unregister actxprxy.dll then reregister it


regsvr32.exe –r c:\windows\system32\actxprxy.dll
regsvr32.exe c:\windows\system32\actxprxy.dll

run these in a command prompt as administrator

On Windows2008 server, the command for unregister is:

 regsvr32.exe /u c:\windows\system32\actxprxy.dll
answered on Server Fault May 21, 2009 by CPU_BUSY • edited Jan 12, 2012 by Sven

Sounds like you need to do a repair on your SSMS on your server (if I'm understanding you correctly). I appears that the COM Interfaces need repaired/reinstalled.


answered on Server Fault May 21, 2009 by JFV

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