Cannot connect to GKE cluster

[hepaco]

I am unable to connect to a GKE cluster. Either from cloud shell or local i get a timeout error:
Error while proxying request: dial tcp **.**.**.**:443: i/o timeout
The cluster in GCP console is always loading, I cannot scale it or do anything. If i go to workloads (workloads/deployments are running, as i can access the services through their ips), the following message appears in gcp console:
Missing data from clusters ***** (unavailable)

or  

Missing data from clusters ***** (deadline exceeded)

any help is appreciated.

[CSekharDas]

Please follow the below steps to diagnose your issue.

• Go to the Kubernetes Engine section in your Google Cloud Console to see if the cluster is up and running without any alarms or warnings
• Check for Google Cloud’s logs to find any errors or warnings related to your Kubernetes services. These logs can give you clues about what’s causing the problem.
• Make sure that your network and firewall settings are correct and that they’re not blocking connections, especially on TCP port 443, which is used for HTTPS traffic.
• Check that your account or the service account you’re using has the right permissions to access the cluster.
• Sometimes disabling and then re-enabling the Kubernetes Engine API in your project can fix underlying issues.
• If you can’t use the console, try restarting parts of the cluster using command-line tools like gcloud or kubectl

I hope this will help, let us know the outcome.