Not able to login or recover external nodes

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