(-4009) - Failed to connect System Landscape Directory(SLD), Contact your system administrator

Since two days ago we started receiving this error.

We didn't change any configurations,

I tried searching for solutions, but non of them helped me.

I am running SAP B1 HANA - SLD Version: 930140

All the Client machines are facing the same error.

Solutions I have tried.

1. Uninstall windows Updates on client PC's

2. Restart SAP Services (./HDB Stop & then Start) (/etc/init.d/sapb1servertools restart)

3. Restart Linux SUSE Server then Start all services (./HDB Start) (/etc/init.d/sapb1servertools start)

4. Check C:\Program Files\sap\SAP Business One DI API\Conf\b1-local-machine.XML file and IP Address of SLD Server

I kindly request the community to help me resolve this issue.