While fetching certificates if you get a message, EXIT STATUS 8500: Connection with the web service was not established. Then confirm from the nbcert logs whether hostname resolution successful or not. If it has failed, then perform the following steps:

Update the Kubernetes operator deployment.yaml and add the hostAliases in the deployment.

In the following hostAliases example,

hostAliases:
- hostnames:
  - backupserver.sample.domain.com
  ip: 10.20.12.13
- hostnames:
  -  mediaserver.sample.domain.com
  ip: 10.21.12.13

Copy, paste the hostAliases example details in the text editor and add to the hostAliases in the deployment.

Create a ConfigMap with backup server name.

Add datamover.hostaliases field map with IP addresses to the hostname.

In the following configmap.yaml example,

apiVersion: v1
data: 
  datamover.hostaliases: "10.20.12.13=backupserver.sample.domain.com, 
10.21.12.13=mediaserver.sample.domain.com"
  datamover.properties: "image=reg.domain.com/datamover/image:latest"
  version: "1"
kind: ConfigMap
metadata: 
  name: backupserver.sample.domain.com
  namespace: kops-ns

To create the configmap.yaml file, run the command:kubectl create -f ConfigMap.yaml.