Hi @gdoyle
Ok. So if the VPN is not the root cause, what could be that you need to add the certificate needs to be known by KNIME – otherwise you run into this specific type of error. To do this, you need to install the correct key in the cacerts store of the KNIME jre enviroment.
Here we have a very nice explanation of another user who did this to a key for his database. But you can also see how to this if you look at this part of our document (specially the part that says “client side”)
You just need to first download the certificate as PEM format. You can find some tutorials how to do this depending on the browser you are using.
Does your company has a specific KNIME installation download link? It could be that they ship their own specific certificates needed for your connection to sharepoint already, and perhaps if you download from knime.com this certificate is missing.
Please let me know if now it is a bit clearer.