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I installed Dynamics CRM 365 on three servers (frontend - backend - DB&SSRS) using the below steps but I am getting error "The plug-in execution failed because no Sandbox Worker processes are currently available. Please try again" and from system jobs details I found "System.ServiceModel.CommunicationObjectFaultedException: The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state", the used plugin is ribbon workbench and cannot use isolation as "None" . Please advise
1- Install DB SQL server && SSRS (1 server)
2- Install frontend (2016) server (4 servers)
3- Install backend (2016) server (2 servers)
4- Install 365 upgrade on frontend servers
5- Install 365 upgrade on backend servers
6- Apply NLB from deployment manager
6- Apply setspn command for the sandbox service
7- Checked that sandbox service is running on backend servers
8- Checked that firewall is opened for TCP port 808 on backend servers
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