I am creating New Kubernetes service connection in Azure DevOps Server 2020 Update 1 via KubeConfig.
When I click to Verify that the connection it says that Verification Failed with the generic error:
Failed to query service connection API: 'https://ekm.mpu.cz/k8s/clusters/c-qmcrb/api/v1/nodes'. Error Message: 'An error occurred while sending the request.'
Please note that the Kubernetess instance is in the other domain.
I have the notion that the error could be with the certs are not imported somewhere on the machine, where the Azure DevOps is hosted, but I am unsure where. The MS documentation is silent about that as well.
So far I've tried to:
Import CA certs to the MMC under trusted publishers.
Import CA certs under cacerts in JAVA-HOME via keytool.
Import CA certs into azureTrustsStore.jks in JAVA-HOME via keytool.
For all 3 I've checked that the CA certs are imported correctly. But to no avail. Could you please advice or redirect me to the method, how to do it?
Additional Info:
While I cannot Verify and Save the connection, I still can Save it and then use it in the pipeline and it works OK! (sucesfully connect and execute the command).

Connection issues can occur for many reasons, but the root cause is often related to an error with one of these items: Network, Authentication, Authorization. You may refer to Basic troubleshooting of cluster connection issues for detailed troubleshooting steps.