Upload node - Error with Amazon S3 Connection

Hi all,


I'm having trouble with the Upload node, when connecting to S3 and trying to upload a .csv file I get this error:

Execute failed: Unable to execute HTTP request: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target


The Amazon S3 connection node is set properly and testing the connection everything looks fine.

I'm using the last version of KNIME (3.4.1) but I tried to download an old one (KNIME 3.3.1) and it still didn't work.

Also, I imported the workflow from another laptop where it worked properly (KNIME 3.3.1), and  I didn't change any setting in the Upload node or in the Amazon S3 connection node. The workflow still works on that laptop and on other laptops connected to the same network, so it must be definitely something machine-related.

Thanks for your help.


Are you using a virus scanner that intercepts SSL connections? The error tells you that the certificate sent by the server isn't trusted by Java. Since S3 only uses trusted certificates it look like something is intercepting the connection and replacing the certificate (which is a really bad thing to do).

Hi thor,

Thanks for your answer. I'll try to follow up with the IT department. What's weird is that in the same company, same office, close desks, we have a different behavior on this, but it might be the case.