Hybrid Restore fails with the error: "Failed to create a remote object. The RPC server is unavailable" (4335790)

When restoring a hybrid object the following error may be shown in the Events for the restore of the restore of the On-Prem object:

Please try disabling the firewall on the RMAD Portal server and the Domain Controller that will be used to perform the restore. You can determine which DC will be used by looking at the RMAD Portal Configuration:

1. Open the RMAD Portal
2. Click the Configuration tab
3. Expand Active Directory Domains
4. Note the DC listed under Backups of selected DC

If disabling the firewall does not help, please try the following:

1. Open regedit on the RMAD Portal Server
2. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Quest\Recovery Manager for Active Directory
3. Create a new DWORD named ConfigureFirewallAfterRestoreInPortal
4. Set the value to 1