"No REST endpoint found" error

Hi Team,

We have recently created a GCP instance and installed KNIME Server as per the KNIME Server installation guide.
Server version installed: 4.13.1
Executor version: 4.4.1

When I try to configure the mount point in Preferences->KNIME Explorer of a KNIME 4.4.0 AP, I get the below error:
No REST endpoint found.
Please enter address top KNIME Webportal.

See the screenshot for details.

From the same host as KNIME AP is running, I could connect to the webportal from browser.

Below are the errors in KNIME AP console:

ERROR ServerAdditionalInformationPanel            Could not connect to server at https://knime-server.gcp.tsg.schrodinger.com/knime: please check the following errors
ERROR ServerAdditionalInformationPanel            Failed attempted connection to https://knime-server.gcp.tsg.schrodinger.com/knime: javax.net.ssl.SSLHandshakeException: SSLHandshakeException invoking https://knime-server.gcp.tsg.schrodinger.com/knime: PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
ERROR ServerAdditionalInformationPanel            Failed attempted connection to https://knime-server.gcp.tsg.schrodinger.com/knime/rest: javax.net.ssl.SSLHandshakeException: SSLHandshakeException invoking https://knime-server.gcp.tsg.schrodinger.com/knime/rest: PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
ERROR ServerAdditionalInformationPanel            Failed attempted connection to https://knime-server.gcp.tsg.schrodinger.com/knime/knime/rest: javax.net.ssl.SSLHandshakeException: SSLHandshakeException invoking https://knime-server.gcp.tsg.schrodinger.com/knime/knime/rest: PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed
ERROR ServerAdditionalInformationPanel            Failed attempted connection to https://knime-server.gcp.tsg.schrodinger.com/knime/knime/rest/v4: javax.net.ssl.SSLHandshakeException: SSLHandshakeException invoking https://knime-server.gcp.tsg.schrodinger.com/knime/knime/rest/v4: PKIX path validation failed: java.security.cert.CertPathValidatorException: validity check failed

Hi @ravikiran,

It might be the missing port in the configuration. the default would be 8443 and should be added before the /knime. E.g. https://machine-url:8443/knime

If you are able to connect to the webportal this should also reveal the right URL (login page).

It could also be caused by a connection failure due to a wrong network setup (missing proxy or the need to whitelist the KNIME Server from the proxy usage. Please find more on this here: FAQ | KNIME

Best,
Michael

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Thanks for the pointers Michael. I will look into these and get back.

Hi Michael,

The issue turns out to be an expired license for the gcp instance itself. Renewing the gcp license fixed the issue and I could connect to the KNIME Server hosted on the gcp instance.

Thanks a lot for your inputs.

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