Certificate Issue: "Usage of certificate is not allowed"|OPC UA Standard|Forum|OPC Foundation

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Certificate Issue: "Usage of certificate is not allowed"
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Yufeng Li
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06/22/2021 - 06:58
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Hi Experts,

I am currently trying to connect (from OPC client) to a sample server using certificate. I got an exception on the server while calling CertificateValidator.Validate(certificate), "Usage of certificate is not allowed".

Any hint on what might cause the problem?

Thanks!

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Randy Armstrong
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06/22/2021 - 10:45
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See https://reference.opcfoundatio.....rt6/6.2.2/

Check the keyUsage and extendedKeyUsage.

keyUsage    keyUsage Specifies how the Certificate key may be used.
Shall include digitalSignature, nonRepudiation, keyEncipherment and dataEncipherment.
Other key uses are allowed.
extendedKeyUsage    keyUsage Specifies additional key uses for the Certificate.
Shall specify ‘serverAuth and/or clientAuth.
Other key uses are allowed.
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Yufeng Li
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06/22/2021 - 18:06
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Thank you so much for the information!

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