Binaryworld - Avoiding Access Denied erros when raising events from MTS objects ... [ VB -> COM-COM+ ]

If you don't take specific actions, you get an Access Denied Error when you try to raise an event from an MTS component into a client. This happens because the client executable doesn't have the proper DCOM security settings to let the server call it back. In order to have it working you have two solutions:

1) Open wide DCOM security settings on the client side
2) Add the proper DCOM security settings for the client executable in the registry (you cannot call CoInitializeSecurity in a VB client).

Or

a) Add a new key with the name of the client executable under the AppId key
b) Generate a GUID with guidgen.exe
c) Add a key with such value under the AppId key
d) Add a string value under the key created in step a whose name is AppID and the value is the generated GUID vaue
e) Add the proper security settings under the GUID key.

Here is an example:

Click here to copy the following block

REGEDIT4] [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\yourclient.exe] @= _
"YourClient"
"AppID"="{YourGuid}" [HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID\{YourGuid}] @= _
"YourClient"
"AuthenticationLevel"=dword:00000001

See http://msdn.microsoft.com/library/psdk/com/reg_33y1.htm for further info.