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Exception while trying to connect to an OPC UA Server
14 Sep 2023 14:52 #12134
by micham
Replied by micham on topic Exception while trying to connect to an OPC UA Server
One more thing.... We have tried the IMPROPER (insecure) way by adding section below, but still the connection could not be established.
If gAcceptAnyCertificate Then
EasyUAClient.SharedParameters.EngineParameters.CertificateAcceptancePolicy.AcceptAnyCertificate = True
End If
Any idea why?
Thank you.
Michael
If gAcceptAnyCertificate Then
EasyUAClient.SharedParameters.EngineParameters.CertificateAcceptancePolicy.AcceptAnyCertificate = True
End If
Any idea why?
Thank you.
Michael
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14 Sep 2023 13:34 #12132
by micham
Replied by micham on topic Exception while trying to connect to an OPC UA Server
Hi,
You have mentioned that the certificate should be placed in these folder:
"C:\ProgramData\OPC Foundation\CertificateStores\UA Certificate Authorities\certs"
and
"C:\ProgramData\OPC Foundation\CertificateStores\UA Applications\certs".
My customer says that the following folder does not exist on his computer.
"C:\ProgramData\OPC Foundation\CertificateStores\UA Certificate Authorities\certs"
Should we manually create this folder and place the certificate in it?
See the attached screen capture.
Thank you.
Michael
You have mentioned that the certificate should be placed in these folder:
"C:\ProgramData\OPC Foundation\CertificateStores\UA Certificate Authorities\certs"
and
"C:\ProgramData\OPC Foundation\CertificateStores\UA Applications\certs".
My customer says that the following folder does not exist on his computer.
"C:\ProgramData\OPC Foundation\CertificateStores\UA Certificate Authorities\certs"
Should we manually create this folder and place the certificate in it?
See the attached screen capture.
Thank you.
Michael
Attachments:
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13 Sep 2023 11:50 #12102
by support
Replied by support on topic Exception while trying to connect to an OPC UA Server
Hello.
I cannot resist the feeling that you are making fun of me. Have you even looked at the document?!
They are getting the SAME BadCertificateChainIncomplete error as you get with QuickOPC:
And then they forcefully accept the otherwise untrusted certificate:
So this is PRECISELY what I have predicted. They are NOT connecting securely, because they cannot be sure that the server they are connecting to is genuine, or fake/rogue.
The proper way of resolving this is, as I wrote: The CA certificate(s) need to be placed into the Trusted issuers store (in addition to Trusted peers).
This should not be too difficult. They just need to know where their server got the certificate from (the CA). Then, whoever runs the CA should be able to give them CA cert (public part; in .DER format). And then just place it to "C:\ProgramData\OPC Foundation\CertificateStores\UA Certificate Authorities\certs" and "C:\ProgramData\OPC Foundation\CertificateStores\UA Applications\certs".
The IMPROPER (insecure) way of "resolving" it is e.g.
- in UA Expert, accepting the certificate forcefully, as they did,
- In QuickOPC applications: Set EasyUAClient.SharedParameters.EngineParameters.CertificateAcceptancePolicy.AcceptAnyCertificate to True (opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User's...licy~AcceptAnyCertificate.html ).
Regards
I cannot resist the feeling that you are making fun of me. Have you even looked at the document?!
They are getting the SAME BadCertificateChainIncomplete error as you get with QuickOPC:
And then they forcefully accept the otherwise untrusted certificate:
So this is PRECISELY what I have predicted. They are NOT connecting securely, because they cannot be sure that the server they are connecting to is genuine, or fake/rogue.
The proper way of resolving this is, as I wrote: The CA certificate(s) need to be placed into the Trusted issuers store (in addition to Trusted peers).
This should not be too difficult. They just need to know where their server got the certificate from (the CA). Then, whoever runs the CA should be able to give them CA cert (public part; in .DER format). And then just place it to "C:\ProgramData\OPC Foundation\CertificateStores\UA Certificate Authorities\certs" and "C:\ProgramData\OPC Foundation\CertificateStores\UA Applications\certs".
The IMPROPER (insecure) way of "resolving" it is e.g.
- in UA Expert, accepting the certificate forcefully, as they did,
- In QuickOPC applications: Set EasyUAClient.SharedParameters.EngineParameters.CertificateAcceptancePolicy.AcceptAnyCertificate to True (opclabs.doc-that.com/files/onlinedocs/QuickOpc/Latest/User's...licy~AcceptAnyCertificate.html ).
Regards
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