Listener issue

Hello,

I have a couple databases running 10205 in a development environment.  The 
production environment had not been upgraded yet, and was running 10203.  The 
Application team wanted us to restore a couple of the databases from production 
onto development and keep it 10203.  I still had the binaries on development so 
removed the 10205 databases and then recreated them as 10203 from the backup.

The listener was running out of the 10205 binaries, so I just updated the 
oracle home there.  For some reason, the connection to the databases running 
10203 is dropping with "ORA-12537: TNS:connection closed".  I am pretty sure I 
have done this plenty of times in the past on different servers, so can't 
figure out what the problem is.  I thought as long as the listener is running a 
higher version (10205), I should be fine.  The listener still hands off the 
connection to the databases that remain 10205 without a problem.  If I shutdown 
the 10205 listener, and startup the old 10203 listener, it hands off the 
connection to the newly refreshed 10203 databases without a problem.

The error showing up in the listener.log is

26-APR-2012 15:35:10 * 
(CONNECT_DATA=(SID=<DB_NAME>)(CID=(PROGRAM=sqlplus@<machine>)(HOST=machine)(USER=oracle)))
 * (ADDRESS=(PROTOCOL=t
cp)(HOST=machine)(PORT=54980)) * establish * SID * 12518
TNS-12518: TNS:listener could not hand off client connection
 TNS-12547: TNS:lost contact
  TNS-12560: TNS:protocol adapter error
   TNS-00517: Lost contact
    Solaris Error: 32: Broken pipe    

I know I must be missing something, but can't think of what it is.  Any ideas?

Thanks is advance
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