why does SolidWorks work on license server, not on clients. what do i need to do to network configuration or specify in the license file

hi

I am having an issue after upgrading license server to 2017 version.  License server no longer seems to be working at client end.

I can run SolidWorks, SolidWorks Electrical, and Composer as they are installed on the server.  however from a client PC, I get the error message (-96,491,0)

I believe this is a network issue, however I can telnet to the license server on port 25734.

Why am I not getting a license at the client end?

Can anyone help?

thanks

SolidworksAdministration