ORA-12547

I've got a strange problem.  I duplicated an 11.2.0.4 RAC database to a new machine running 11.2.0.4 (patched exactly the same).  Everything seems to work fine...except local sqlplus connections for users other than oracle. IE:

su - oracle

export ORACLE_SID=dup1;

export ORACLE_HOME=/app/oracle/product/11.2.0.4/db

export LD_LIBRARY_PATH=$ORACLE_HOME/lib:$LIBRARY_PATH

export PATH=$ORACLE_HOME/bin:$PATH

sqlplus someuser/theirpassword

sql>

So, everything is good to go with the above.  Next I try:

su - some_other_user

export ORACLE_SID=dup1;

export ORACLE_HOME=/app/oracle/product/11.2.0.4/db

export LD_LIBRARY_PATH=$ORACLE_HOME/lib:$LIBRARY_PATH