OPC Server Connection not possible (with LabView 7.0 it is working)

Question

We have used LabView 7.0 to view OPC items on a remote server (Windows CE).
On WindowsCE it's not possible to browse the remote registry, therefore we
make the registry settings on the client Computer and are setting the
"RemoteServerName". For LabView 7.0 it was working.
With LabView 7.1 when we try the same with the sample "Browse to OPC Item.vi"
we get the Message Box "NI Network Browser Error!" "This OPC Server does not support
the interface: IOPCBrowseServerAddressSpace error code - 0x80070005 Access denied!"
Has any one an idea what has changed since LabView 7.0.
The OPC Server has also an OPCEnum running. Is there any way to read this information?
Here are the whole registry setting for the local machine to connet to remot OPC-Server:
REGEDIT4
[HKEY_CLASSES_ROOT\AppID\{4841A238-5E78-48AB-A9ED-666AD68F4841}]
@="Inficon Quadrupol Massenspektrometer DA"
"AuthenticationLevel"=dword:00000000
"RemoteServerName"="192.168.0.206"
[HKEY_CLASSES_ROOT\Inficon.Quadrupol.Massenspektrometer.DA]
@="Inficon Quadrupol Massenspektrometer DA"
[HKEY_CLASSES_ROOT\Inficon.Quadrupol.Massenspektrometer.DA\CLSID]
@="{4841A238-5E78-48AB-A9ED-666AD68F4841}"
[HKEY_CLASSES_ROOT\Inficon.Quadrupol.Massenspektrometer.DA\OPC]
[HKEY_CLASSES_ROOT\Inficon.Quadrupol.Massenspektrometer.DA\OPC\Vendor]
@="Inficon"
[HKEY_CLASSES_ROOT\CLSID\{4841A238-5E78-48AB-A9ED-666AD68F4841}]
@="Inficon Quadrupol Massenspektrometer DA"
"AppID"="{4841A238-5E78-48AB-A9ED-666AD68F4841}"
[HKEY_CLASSES_ROOT\CLSID\{4841A238-5E78-48AB-A9ED-666AD68F4841}\Implemented Categories]
[HKEY_CLASSES_ROOT\CLSID\{4841A238-5E78-48AB-A9ED-666AD68F4841}\Implemented Categories\{63D5F432-CFE4-11D1-B2C8-0060083BA1FB}]
[HKEY_CLASSES_ROOT\CLSID\{4841A238-5E78-48AB-A9ED-666AD68F4841}\Implemented Categories\{CC603642-66D7-48F1-B69A-B625E73652D7}]
[HKEY_CLASSES_ROOT\CLSID\{4841A238-5E78-48AB-A9ED-666AD68F4841}\ProgID]
@="Inficon.Quadrupol.Massenspektrometer.DA"
[HKEY_CLASSES_ROOT\CLSID\{4841A238-5E78-48AB-A9ED-666AD68F4841}\VersionIndependentProgID]
@="Inficon.Quadrupol.Massenspektrometer.DA"
Regards, Robert

Answer 1

Hi Robert
LabVIEW 7.1 implements some new security features dealing with DCOM that were not in 7.0. Windows is moving in this direction, and National Instruments decided to follow suit. 7.1 requires a certain level of authentication from the server. If this is the issue in your case, it can be resolved with the following steps (this is for Windows XP; CE will probably be different):
1. On the computer hosting your OPC server select "Start >> Settings >> Control Panel >> Administrative Tools >> Component Services.
2. On the tree on the left, expand "Component Services >> Computers >> My Computer >> DCOM Config.
3. Your OPC server should be registered as one of these items. Right-click on your server and select "Properties."
4. On the "General" tab, change the "Authentication Level" to "Connect."
If this property is already set to Connect or Default (and the default setting is Connect) then this will have no effect.
You can also try checking some of the other settings:
1. On the computer hosting your OPC server select "Start >> Settings >> Control Panel >> Administrative Tools >> Component Services.
2. On the tree on the left, expand "Component Services >> Computers >> My Computer
3. Right-click on My Computer and select "Properties."
4. On the "Default Properties" tab, make sure "Default Impersonation Level" is set to "Identify."
You may also want to look at the "COM Security" tab to make sure your computer has the right permissions.
If all else fails, you can try adding the line "ole.AuthnLevel = 1" to the LabVIEW.ini file. This should reverse some of the changes to 7.1.
regards
Manuel Wielander
National Instruments