SPEndPointAddressNotFoundException: There are no addresses available for this application

From time to time, I would receive support requests where some backend services was stopped for whatever reason. From an end user point of view, they only see that something is no longer working. However, looking at ULS, it becomes very obvious as you would see this kind of exception:

SPEndPointAddressNotFoundException: There are no addresses available for this application.

Typically, this is either a matter of restarting the service instances and / or running the Application Address Refresh Job

Here is also some powershell to see what the SharePoint Round Robin Load Balancer sees:

$proxyName = 'proxy name'

$saName = 'service application name'

$proxy = Get-SPServiceApplicationProxy | Where-Object {$_.TypeName -eq $proxyName}

$loadBalancer = $proxy.LoadBalancer

$loadBalancerContext = $loadBalancer.BeginOperation()

$loadBalancerContext.EndpointAddress

$sa = Get-SPServiceApplication -Name $saName

$sa.EndPoints | Format-List

One other common thing is to be specific about the SharePoint Round Robin Load Balancer. I often have to clarify that this is for backend services as often SharePoint admins get this mixed up with a WFE load balancer.

Also, here is a link to a very useful description about the SharePoint Topology Service:
https://blogs.msdn.microsoft.com/besidethepoint/2011/02/19/how-i-learned-to-stop-worrying-and-love-the-sharepoint-topology-service/