This is a good first step if the PC is unable to connect to a server, or displays error messages as it contacts the server. Rebooting the machine resets network hardware and software. If the problem is caused by a temporary license that has expired, rebooting renews the license for 30 minutes.
For the Windows client, delete the file:
Replace interface with the name of the actual interface in use, for example: c:\pcnfspro\dhcp\pk0.bin.