Cannot login to the HUB from the KNIME application. Cannot get extensions or the AI, etc.....

Can anyone help with this error?

Hello mckenrd,

thank you for the post.

Your message and error indicate a network issue.
Especially since you can’t install extensions, that sounds like a PKIX error (certificate error).

Please provide us with the following information in order to find the cause of this behavior.

Do you try to connect to the KNIME Community Hub or to your own server?
What error do you get while installing extensions?
Can you please provide the error logs for investigation?
You can find them in the .metadata folder of your local workspace.

We think it might be the issue as seen down below.
looking forward to your detailed feedback.


The underlying error “PKIX path building failed” suggests that you are connecting to a web service that returns an untrusted certificate, which prevents KNIME from establishing a secure (https) connection to that service.

Since this is a connection to a KNIME service, which uses trusted certificates, you likely are behind a company proxy that replaces the SSL certificate.

To resolve this, you can try any of these:

  • Import the required SSL certificate(s), see this video: Resolving Common KNIME Certificates Problems - YouTube
    • The certificate would be provided by your companies IT or network team.
  • Use http instead of https (unencrypted communication).
    • For KNIME update sites, this is found under File > Preferences > Install/Update > Available Software Sites.
  • Possibly change the proxy configuration you’re using (File > Preferences > General > Network Connections).
  • Should the proxy certificate be preconfigured in Windows by your IT, you can use the Windows trust store. To do so, add these two lines at the end of the knime.ini within the KNIME installation folder (while KNIME isn’t running):
-Djavax.net.ssl.trustStore=NONE
-Djavax.net.ssl.trustStoreType=WINDOWS-ROOT

Thank you and best regards,
Alex.

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