Unable to add storage systems after upgrading SnapCenter Server

Description

After upgrading SnapCenter Server, if you try to add a storage system without upgrading the plug-ins on the host, the operation fails.

Error message

Failed on Host: host_name. There was no endpoint listening local host that could accept the message. This is often caused by an incorrect address or SOAP action. See InnerException, if present, for more details.

Corrective Action

You must upgrade the plug-ins on the host before adding any storage system.