External procedure call error in RAC

I met a strange problem today with Oracle RAC 10.2.0.4:
Situation I:
In the sequence of tnsnames.ora or TAF, put NodeA before NodeB, everything works well. Even if NodeA is down and only NodeB works.
Situation II:
If put NodeB before NodeA, strange things happened.
1) I can connect to via type2(tnsnames) or type4(url) via sqlplus, and I can also call my extproc in sqlplus.
2) If I call external procedure via API, whatever type2 or type4, it will report "ORA-06576: not a valid function or procedure name"
RAC should share anything on both nodes, why Situation I and Situation II have different behaviour? Can anyone help me? Thanks!

Thanks.
In fact, using the supplied makefile in $ORACLE_HOME/plsql/demo and MAKING SURE THAT THE .SO IS EXECUTABLE(!) works.

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Cannot get external procedural call in Oracle RAC Environment

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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))
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[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)
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SQL> execute ttran.shell('ls');
BEGIN ttran.shell('ls'); END;
ERROR at line 1:
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Hello,
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I have to call an external procedure (c program) which is in another(remote) host system.
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Hi,
I found the answare, it seem that for security reason the listener,extproc agent and the instance must be on the same host.
Reference : (http://docs.oracle.com/cd/E11882_01/appdev.112/e10825/pc_07pls.htm#sthref1051)
>
The database server, the agent process, and the listener process that spawns the agent process must all reside on the same host.
>
>
For security reasons, extproc, by default, loads only DLLs that are in directory $ORACLE_HOME/bin or $ORACLE_HOME/lib. Also, only local sessions—that is, Oracle Database client processes that run on the same system—are allowed to connect to extproc.

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