Unable to modify settings, because one or more RD Session Host servers are unreachable or misconfigured. Remove these RD ...

Unable to modify settings, because one or more RD Session Host servers are unreachable or misconfigured. Remove these RD Session Host servers by using the Remove-RDSessionHost cmdlet, and then try again.
Unreachable RD Session Host servers: {0}
Misconfigured RD Session Host servers: {1}