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Dropbox library problem "unable to find valid certification path"

We started experiencing certificate issues with dropbox jar file libraries a week ago, for 2 days then resolved.
Today we are experiencing t6he same. Our Apps cannot access the files.
The error message log is as below:

com.dropbox.core.NetworkIOException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

at com.dropbox.core.DbxRequestUtil.startPostRaw(DbxRequestUtil.java:284)

at com.dropbox.core.v2.DbxRawClientV2$1.execute(DbxRawClientV2.java:146)

at com.dropbox.core.v2.DbxRawClientV2.executeRetriable(DbxRawClientV2.java:330)

Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:148)

at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:129)

at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)

at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:434)

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Accepted answers

Rich

engirah wrote:
The sdk version running for all our clients is 4.7.1

This is likely a result of outdated root certificates in the SDK version that you're using. You can read more about it here and here. You'll need to update to the latest SDK version.

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Jay

Hi @engirah, thanks for bringing this to our attention.

Could you clarify what OS you're currently using, and what version of the Dropbox desktop application was running on your machine?

Any other info or screenshots would be helpful!

engirah

Hi @Jay
The OS is Windows 10 & Windows 11
The sdk version running for all our clients is 4.7.1

Jay

Are you creating an app using the Dropbox API, or the normal Dropbox desktop application?

Rich

engirah wrote:
The sdk version running for all our clients is 4.7.1

This is likely a result of outdated root certificates in the SDK version that you're using. You can read more about it here and here. You'll need to update to the latest SDK version.

engirah

Noted
My main challenge is manually cycling all my clients to update their versions with current sdk7.0.0
If given a 24 hours window, that will greatly help

Rich

engirah wrote:
If given a 24 hours window, that will greatly help

This was originally announced 18 months ago, and the rollout has already occurred. I don't think Dropbox would be able to give you a window to update your app. That would require them to roll back the work they've already done which would affect everyone using the API.