DOCUMENT:Q180384 27-JAN-2001 [vbwin] TITLE :HOWTO: Troubleshoot Run-time Error '70' in DCOM Applications PRODUCT :Microsoft Visual Basic for Windows PROD/VER::5.0,6.0 OPER/SYS: KEYWORDS:kbDCOM kbRegistry kbVBp kbVBp500 kbVBp600 kbGrpDSVB kbDSupport ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual Basic Professional Edition for Windows, versions 5.0, 6.0 - Microsoft Visual Basic Enterprise Edition for Windows, versions 5.0, 6.0 ------------------------------------------------------------------------------- SUMMARY ======= Attempting to access a DCOM Server from a remote client application sometimes results in the following error: Run-time error '70': Permission Denied This article describes the most common scenarios in which this error is raised. MORE INFORMATION ================ Run-time error '70' is typically the result of a security or permissions issue. The following is a list of possible causes of run-time error 70 but is by no means a complete or definitive list. DCOM Is Not Enabled ------------------- If the Server machine does not have DCOM enabled, client machines will receive run-time error 70 when attempting to access the server. This scenario applies to Windows 2000, Windows NT, Windows 95, Windows 98, and Windows Me servers: 1. On the Server machine, run DCOM Config (DCOMCNFG.EXE). 2. Choose the Default Properties tab. 3. Ensure that Enable Distributed COM on this computer is checked. This value is stored in the Windows Registry at the following location: HKEY_LOCAL_MACHINE\Software\Microsoft\OLE The Client User Does Not Have Sufficient Permissions ---------------------------------------------------- If the client user does not have the correct permissions, access to the DCOM Server can be denied. There are several steps to take in order to ensure your client has valid privileges. If the Server is Windows 95, Windows 98, or Windows Me: 1. Run DCOM Config. 2. Select the DCOM Server application from the list of available applications. 3. Select the Properties button, or double-click the DCOM Server application in the list. 4. Test the server with "Default Access Permissions." If run-time error '70' still occurs, the default access permissions are restricting your user. If this is the case, then modify the Default Access Permissions from the Default Security tab in DCOM Config. Grant the client user access permissions. If run-time error '70' does not occur running with default access permissions, it is likely that the custom access permissions are restricting your client from accessing the DCOM Server. Choose custom access permissions and select the Edit button. Grant the client user access permissions. If the Server is Windows NT or Windows 2000: 1. Run DCOM Config. 2. Select the DCOM Server application from the list of available applications. 3. Select the Properties button, or double-click the DCOM Server application in the list. 4. Test the server with "Default Access Permissions," "Default Launch Permissions," and "Custom Configuration Permissions." If run-time error '70' still occurs, it is likely that the default access permissions are restricting your user. If this is the case, modify the Default Access Permissions from the Default Security tab in DCOM Config. If run-time error '70' does not occur, it is likely that the custom access permissions are restricting your client from accessing the DCOM Server. Choose to use Custom access permissions and choose the Edit button. Grant the client user account access permissions, or grant a group the client user belongs to access permissions. For more information regarding security groups on Windows NT see the table to follow. There are several group accounts you will find when you configure users and groups on Windows NT and Windows 2000. The following list is a summary of who belongs to each group: Group Description -------------------------------------------------------------------------- Interactive Includes all users who log onto a Windows NT or Windows 2000 system locally (at the console). It does not include users who connect to NT resources across a network or are started as a server. Network Includes all users who connect to Windows NT or Windows 2000 resources across a network. It does not include those who connect through an interactive logon. Creator/Owner The Creator/Owner group is created for each sharable resource in the Windows NT or Windows 2000 system. Its membership is the set of users who either create a resource (such as a file) and who take ownership of them. Everyone All users who access the system, whether locally, remotely, or across the network. System The local operating system. The above list includes the group accounts which are intrinsic to Windows NT and Windows 2000 systems. Your particular network may include more groups from which you may choose. In order to determine the membership of each custom group account, you must contact your network administrator. Attempting to Access DCOM Server Across Non-Trusted Domains ----------------------------------------------------------- If your DCOM Server resides in one Windows NT or Windows 2000 domain, and your client logs on to a second Windows NT or Windows 2000 domain that is not "trusted" by the first, you will receive run-time error '70' when attempting to access the DCOM Server. For additional information, please see the following article in the Microsoft Knowledge Base: Q158508 : FAQ: COM Security Frequently Asked Questions REFERENCES ========== For additional information, please see the following article in the Microsoft Knowledge Base: Q176799 : INFO: Using DCOM Config (DCOMCNFG.EXE) on Windows NT Additional query words: ====================================================================== Keywords : kbDCOM kbRegistry kbVBp kbVBp500 kbVBp600 kbGrpDSVB kbDSupport Technology : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB500Search kbVB600Search kbVBA500 kbVBA600 kbVB500 kbVB600 Version : :5.0,6.0 Issue type : kbhowto ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.