During a restore operation that accesses VMs, the vCenter Server timed out while waiting for a response from the SnapCenter server.
This error can occur when VMotion or the actual restore operation exceeds the timeout set for responses from the SnapCenter server.
The operation has timed out
You can increase the SnapCenter server timeout value by including the following REST API in the appsetting section of the SMCoreServiceHost.exe.Config file located under SmCore in the SnapCenter Server: <add key="RESTTimeout" value="timeout-value"/>
The default timeout value is 10800000 (in milliseconds, which is 3 hours). You can increase that value, in milliseconds, as needed.