Cannot get external procedural call in Oracle RAC Environment

Cannot get external procedure call to work in our test RAC env.
We are able to get it to work in our DEV env which is a single instance
LISTENER.ORA:
NODE1:
# listener.ora Network Configuration File: /opt/oracle/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.
LISTENER_SBLBGT01 =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = sblbgt01-vip1)(PORT = 1521)(IP = FIRST))
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.41.1.21)(PORT = 1521)(IP = FIRST))
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /opt/oracle/app/oracle/product/10.2.0/db_1)
(PROGRAM = extproc)
(ENVS="EXTPROC_DLLS=ANY")
NODE2:
# listener.ora.sblbgt02 Network Configuration File: /opt/oracle/app/oracle/product/10.2.0/db_1/network/admin/listener.ora.sblbgt02
# Generated by Oracle configuration tools.
LISTENER_SBLBGT02 =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = sblbgt02-vip2)(PORT = 1521)(IP = FIRST))
(ADDRESS = (PROTOCOL = TCP)(HOST = 172.41.1.22)(PORT = 1521)(IP = FIRST))
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /opt/oracle/app/oracle/product/10.2.0/db_1)
(PROGRAM = extproc)
(ENVS="EXTPROC_DLLS=ANY")
2) ### If you are receiving errors, please list exact error messages and text: ###
(cont 1.)
tnsnames.ora (on both nodes):
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = extproc))
(CONNECT_DATA = (SID = PLSExtProc) (PRESENTATION = RO)))
[opt/oracle/app/oracle/product/10.2.0/db_1/network/admin]> tnsping EXTPROC_CONNECTION_DATA
TNS Ping Utility for Solaris: Version 10.2.0.3.0 - Production on 11-APR-2011 10:52:49
Copyright (c) 1997, 2006, Oracle. All rights reserved.
Used parameter files:
/opt/oracle/app/oracle/product/10.2.0/db_1/network/admin/sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = IPC)(KEY = extproc)) (CONNECT_DATA = (SID = PLSExtProc) (PRESENTATION = RO)))
OK (0 msec)
Calling External Procedure:
SQL> execute ttran.shell('ls');
BEGIN ttran.shell('ls'); END;
ERROR at line 1:
ORA-28575: unable to open RPC connection to external procedure agent
ORA-06512: at "TTRAN.SHELL", line 1
ORA-06512: at line 1

Any Reply Please...
would appreciate your help...

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