title: TNS:Protocol Adapter Error
body: <p>I am attempting to connect to an Oracle 11.2.0.2 64 bit database from a Win 7 and Win 8.1 machine with the Oracle 11.2.0.4 32 bit client.  I can successfully ping the server and TNSPing the listener on both machines.  But when I try to log into SQLPLus using system and my password I receive ORA-12560 TNS:Protocol Adapter Error.  I can log into SQLPlus on the server.  Any ideas?  DB has been restarted as well as the listener.  ORACLE_SID is set.  I'm stuck... </p>