Not able to login or recover external nodes

KNIME Extensions
1

I upgraded KNIME to last available version on 18/12/2025. Knime 5.9.

Not able to login, to cnnect to Community or to recover external nodes already available on the previous version. Pls advise.

Also, got these messages:

Some sites could not be found. See the error log for more detail.
Unable to read repository at https://update.knime.com/partner/latest/content.xml.
(certificate_unknown) PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Unable to read repository at https://update.knime.com/community-contributions/trusted/latest/content.xml.
(certificate_unknown) PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Unable to read repository at https://update.knime.com/analytics-platform/latest/content.xml.
(certificate_unknown) PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

2

Did you update a previous version or download a fresh 5.9? What OS are you running?

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3

@williamramirezq This looks like a Java certificate trust issue (PKIX path building failed), often caused by proxies or SSL inspection. It’s not specific to the nodes themselves.

Here is a related thread, and check this short video, which explains the problem and typical resolution:

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