SAP B1 Client Access from outside network

HI all,

We are having a SAP Business one installation on HANA High Availability. due to pandemic most of the users are working from home. we installed the client on there home PC and in login screen it displays companies but after login it gives error. "License server not found" we opened all the ports.

we are able to access SLD only while accessing SAP client it shows this error.

please suggest what could be the issue.