Server Administration :: ORA-12537 / TNS / Connection Closed

I am trying to create a job that will execute a shell script on a remote server (Server B) when an existing job, on the local server (Server A), completes.

I have spent the last couple of days combing through Metalink, Oracle Documentation, AskTom, and Google. I know this is a relatively "new" feature/ability - released with 11.2 - but this particular error stack is no where to be found. I have attempted to be completely thorough with the information I provided, along with being diligent about masking important configuration information.

While the calling Job is starting the second job, the second job appears to timeout at 60 seconds and the job status is reported as failed with this error stack:

ORA-12537: TNS:connection closed
ORA-06512: at "SYS.DBMS_ISCHED", line 4921
ORA-06512: at "SYS.DBMS_ISCHED", line 6853
ORA-29273: HTTP request failed
ORA-06512: at "SYS.UTL_HTTP", line 1130
ORA-29261: bad argument
ORA-06512: at "SYS.DBMS_SCHEDULER", line 3975
ORA-06512: at line 1

Configuration information:

Server A and Server B OS Version/Kernal Information:
Oracle Linux Server release 5.8
x86_64
2.6.32-300.24.1.el5uek

Database Version, on all databases, is:

Oracle Database 11g Enterprise Edition
11.2.0.3.0 - 64bit

Remote Scheduler Agent version, on both servers is: 11.2.0.3.1

Here is the listener status on Server B for db2:

serverb $$ lsnrctl status listdb2
LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 23-JUL-2013 11:39:27
Copyright (c) 1991, 2011, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=***)))
STATUS of the LISTENER

[code]...

I have configured both servers with remote Scheduler agents and both databases have been configured and registered with the agents.

I have executed the shell script on Server B and it performs as expected.

I have the primary job calling the remote job, and that is performing as expected.

I have tested the connection from DB1 on Server A to DB2 on Server B with this

SQL> set serveroutput on
SQL> DECLARE
2 versionnum VARCHAR2(30);
3 BEGIN
4 versionnum := DBMS_SCHEDULER.GET_AGENT_VERSION('ServerB.someplace.net');

[code]...

and I have tested the connection from DB2 on Server B to DB1 on Server A with this

SQL> set serveroutput on
SQL> DECLARE
2 versionnum VARCHAR2(30);
3 BEGIN
4 versionnum := DBMS_SCHEDULER.GET_AGENT_VERSION('ServerA.someplace.net');

[code]...