Is this occurring for all clients or just certain ones? ORA-03114 typically means that the client can't make a connection with Oracle. I would make sure that Oracle/dataserver is up and running and that there aren't any impediments with connecting to it via the client (i.e. firewall/network issues, or sqlnet.ora configuration settings on the client).
This is only an issue on computers that are on a seperate network from the license server. The license server is across a VPN connection. It has always been but we had a provider change and the VPN was redone. The VPN is wide open (all traffic allowed) and there are no firewalls turned on in between (client and server firewalls are off). Ports are open and responding normally from the client testing across the VPN to the license server. sqlnet.ora file on the client is nearly empty with no configuration parameters.