SharePoint workflow stopped working – error: Unable to properly communicate with the workflow service

All SP workflows in the SharePoint site, suddenly stopped working!

When I tried to republish a workflow, I got this error: “Unable to properly communicate with the workflow service”

Solution:

Verify that all the following Windows NT services are started:

a.       WorkflowServiceBackend

b.       Service Bus Backend

c.       Service Bus Gateway

d.       FabricHostSvc

 

   Recycling the Workflow Management Service application pool:

1.       Open IIS Manager.

2.       Under Application Pools, right-click WorkflowMgmtPool, and select Recycle… from the context menu.

 

 

In IIS find out the WorkflowHostUri

Run the below PowerShell command as an admin:

Register-SPWorkflowService -SPSite "http://localhost/" -WorkflowHostUri "http://localhost:12291/" -AllowOAuthHttp –Force

 

Please see https://msdn.microsoft.com/library/azure/jj193529(v=azure.10).aspx#WorkflowManagementService