title: Upgrade service unreachable status on service fabric Azure
body: <p>I am somehow getting "Upgrade service unreachable" status for service fabric on Azure.And due to this behavior of my application is weird - sometime able to access and sometime not able to access.Also found no issues in virtual machine's event viewer.</p>
  
  <p>I have restart the nodes(3 nodes) as well as restart virtual machines also.</p>
  
  <p>I have also read from <a href="https://docs.microsoft.com/en-us/azure/service-fabric/service-fabric-cluster-upgrade" rel="nofollow noreferrer">Microsoft Documentation</a> but could not found anything.</p>
  
  <p>Anyone have any idea why this could occur and how this status change?</p>