Knowledge Base

PRB: Remote OLE Automation: Using Access Control Lists (ACL)

Article ID: 161821

Article Last Modified on 6/24/2004

APPLIES TO

This article was previously published under Q161821

SYMPTOMS

When using a Client/Server Remote OLE Application, you receive the following error when attempting to create the server:
"Run Time error '-2147023132 (800706e4)': OLE Automation Error"

CAUSE

The server has been configured to "Allow Remote Creates by ACL," and the client has been set up to use an "Authentication" of "None."

RESOLUTION

You can either change the server to "Allow All Creates" or change the client to a compatible authentication level. Changes to the server are made in the Remote Automation Connection Manager. Changes to the Client are made in step 4 of the Application Setup Wizard. A compatibility chart is included in the MORE INFORMATION section of this article.

MORE INFORMATION

Many of the examples given by Microsoft on creating Remote OLE servers suggest using an "Authentication" level of "None" in step 4 of the Setup Wizard for the client application.

Step 4 of the Setup Wizard calls for you to "Add OLE Servers." At this point, you need to change the drop-down box to "List Files of Type:" "Remote OLE Servers (*.vbr)," and select the VBR file that was created when the Server executable was compiled. The VBR file should have the same name and be in the same directory as the server executable.

Immediately after selecting the VBR file, you will see the "Remote OLE Servers Details" dialog box. The last option in the dialog box is "Authentication." This setting is defaulted to "1 - None." In all cases, using an "Authentication" of "None" will cause an error when the client attempts to create an object on the server which has been configured for "Allow Remote Creates by ACL".

The available "Authentication" options are: 
   0 - Default            Use network default.

   1 - None               No authentication.

   2 - Connect            Connection to the server is authenticated.

   3 - Call               Authenticates only at the beginning of each
                          remote procedure call when the server receives
                          the request. Does not apply to connection-based
                          protocol sequences (those starting with the
                          prefix "ncacn").

   4 - Packet             Verifies that all data received is from the
                          expected client.

   5 - Packet Integrity   Verifies that none of the data transferred
                          between client and server has been modified.

   6 - Packet Privacy     Verifies all previous levels, and encrypts the
                          argument values of each remote procedure call.

Refer to "Building Client/Server Applications with Visual Basic," Part 2: Client Server Design, Chapter 7: Implementing OLE Servers, Page 131 - 132, for more information on data authentication.

To assist you in determining which settings to use in the Setup Wizard, the following charts show which combinations of operating systems, protocols, security policies, and authentication levels will work. The values at the beginning of each row are RPC protocols. The values at the top of each column are authentication levels. These charts apply to "Allow Remote Creates by ACL" only.

NOTE: The table below does not cover the case where Microsoft Windows 95 is being used as the server because Microsoft Windows 95 does not support Access Control Lists (ACL) authentication. Using Windows 95 for Remote OLE Automation in this manner will always produce the error described above. Windows 98 and Windows Me do support Access Control Lists (ACL) authentication. 
Client = Win 32 (Win NT 3.51 or Win95)
Server = Win NT 3.51

                    0       1       2       3       4       5       6
                    ---------------------------------------------------

   ncacn_np         OK      error   OK      OK      OK      OK      OK

   ncacn_ip_tcp     OK      error   OK      OK      OK      OK      OK

   ncadg_ip_udp     error   error   error   error   error   error   error

   ncacn_nb_nb      OK      error   OK      OK      OK      OK      OK

   ncacn_nb_tcp     OK      error   OK      OK      OK      OK      OK

   ncacn_nb_ipx     OK      error   OK      OK      OK      OK      OK

   ncacn_spx        OK      error   OK      OK      OK      OK      OK

   ncadg_ipx        error   error   error   error   error   error   error

------------------------------------------------------------------------

Client = Win 16 (WFW 3.11, Win 3.1)
Server = Win NT 3.51

                    0       1       2       3       4       5       6
                    -----------------------------------------------------

   ncacn_np         Log On  error   Log On  Log On  Log On  Log On  Log On

   ncacn_ip_tcp     Log On  error   Log On  Log On  Log On  Log On  Log On

   ncadg_ip_udp     error   error   error   error   error   error   error

   ncacn_nb_nb      Log On  error   Log On  Log On  Log On  Log On  Log On

   ncacn_nb_tcp     Log On  error   Log On  Log On  Log On  Log On  Log On

   ncacn_nb_ipx     Log On  error   Log On  Log On  Log On  Log On  Log On

   ncacn_spx        Log On  error   Log On  Log On  Log On  Log On  Log On

   ncadg_ipx        error   error   error   error   error   error   error

Keywords: kbsetup kbprb KB161821


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