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How to reuse already trusted certificate in .NET OPC UA client

Benjamin Hodzic_1

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08/27/2024 - 01:54

The .NET client, when restarted, fails to establish the connection. I think it fails to find the certificate which is already trusted in the store. (The certificate is already trusted by the server)
Here are the code screenshots:

View post on imgur.com

Any help with this? Error establishing a connection: Error received from remote host: BadSecurityCheecksFailed

Randy Armstrong

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08/28/2024 - 03:07

BadSecurityCheecksFailed = check the server logs for the actual error. (error suppressed to reduce info hackers can use).

Benjamin Hodzic

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08/29/2024 - 01:07

It says the cert has to be trusted. I do that manually but the client doesn't know when it got trusted. Is there an event handler or something similar?

Randy Armstrong

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08/30/2024 - 02:24

If it is coming from the Server then the Server needs to be told to trust the Client certificate.

The client then has to trust the Server certificate in separate step.

Code to manage certificates on the client side is here:

https://github.com/OPCFoundati.....AClient.cs