Issue connecting via proxy client in SQL Developer 4.0

Hi SQL Developers,
I should have posted this earlier, as I have been using SQL Developer 4.0 for several months and noticed the issue some time ago. The environment I am connecting to uses a Windows ISA Proxy desktop client to allow traffic to some databases. I generally use the Oracle Client and OCI connections in SQL Developer. At some point during the SQL Developer releases, connectivity stopped working for certain databases behind the proxy.
The following clients connect to the database behind the proxy without issue:
SQL*Plus 11.2.0.1 64-bit
SQL Developer 4.0.0.12.84 using the SQL*Plus client and OCI
Connectivity to the database behind the proxy does not work with these versions:
SQL Developer 4.0.0.13.80 (tested with Oracle client, thin, etc.)
SQL Developer 4.0.0.13.30 (tested with Oracle client, thin, etc.)
Error Message:
An error was encountered performing the requested operation:
IO Error: The Network Adapter could not establish the connection
Vendor code 17002
Connectivity to other non-proxied databases works for all clients above. I've tried re-creating the connections, re-installing, etc. Nothing works except going back to the earlier version of SQL Developer.
Has anyone else experienced this behavior? I am trying to determine whether the proxy is stopping the client based on a signature or if the client is not routing the connection correctly.
Thanks,
Shad

I think I have found a solution.
Run the command prompt (CMD) in windows and type in the following:
setx _JAVA_OPTIONS -Djava.net.preferIPv4Stack=true
I got this from a java developer and now I'm able to connect

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Here are some details
tnsnames.ora
XE =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = <Cumputername>)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SID = XE)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
listener.ora
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
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(ORACLE_HOME = C:\Oracle11XE\app\oracle\product\11.2.0\server)
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(ORACLE_HOME = C:\Oracle11XE\app\oracle\product\11.2.0\server)
(PROGRAM = extproc)
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(SID_NAME = XE)
(ORACLE_HOME = C:\Oracle11XE\app\oracle\product\11.2.0\server)
(PROGRAM = extproc)
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Uptime 0 days 0 hr. 0 min. 13 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Default Service XE
Listener Parameter File C:\Oracle11XE\app\oracle\product\11.2.0\server\network
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The command completed successfully
Thanks
Edited by: user12026382 on Jan 30, 2013 10:57 AM

Hi clcarter
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The two things I did differently this time was
1. Delete any ORACLE_HOME or ORACLE_SID variables that were existing and just to make sure check from cmd> set ORACLE_HOME - should return not defined.
(This I found at a different forum)
2. Run the setup (as administrator) this time.
And you guessed it.. It worked. I was able to login to the database. Also could go to the database home page.
Thanks for your inputs.
On a side note.. since I am new to forums, I wanted to know how you quote things in the grey area as you did when you replied 'ORA-00205: error in identifying control file, check alert log for more info'.

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973205 wrote:
Hi Experts,
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[SE80 Service Consumer|http://www.image-share.com/upload/706/136.png]
[SE80 ServiceGroups|http://www.image-share.com/upload/706/137.png]
[SoaManager System Connections|http://www.image-share.com/upload/706/138.png]
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========
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