Network Adaptor Problem

I have SQLDev and 11g install on my laptop (vista). Everything was working fine until a few days ago. I was able to connect to the 11g on my laptop and to other DBs across the netword.
Now I cannot connect to the 11g DB on laptop but can still connect to the other DBs across the network.
I get a Network Adaptor cannot establish error vendor code 17002
HELP
Brendan

Yep the listerner is running as I can log into sqlplus using
sqlplus xyz/xyz@orcl
tnsnames.ora contains the following
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = BT-M1330GRVZQ3J.comp.dit.ie)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
lsnrctl status gives the following
LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=BT-M1330GRVZQ3J.comp.dit
.ie)(PORT=1521)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 11.1.0.6.0 - Produ
ction
Start Date 25-MAR-2009 20:21:25
Uptime 0 days 0 hr. 11 min. 1 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File E:\OracleProducts\11.2gDB\product\11.1.0\db_1\network\
admin\listener.ora
Listener Log File e:\oracleproducts\11.2gdb\diag\tnslsnr\BT-M1330GRVZQ3J
\listener\alert\log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=BT-M1330GRVZQ3J.comp.dit.ie)(PORT=15
21)))
Services Summary...
Service "orcl" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orclXDB" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
Service "orcl_XPT" has 1 instance(s).
Instance "orcl", status READY, has 1 handler(s) for this service...
The command completed successfully
Nothing has changed with the DB setup/config over the past few month. I previously logged into SQL Developer last week to the DB on laptop. Nothing was changed since the last login
Except maybe a new Java download and install was automatically done over the past few days. Would this have caused something to happen ???

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>
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