The client should be able to connect.

At this point, I can only think of a networking problem between the host and the guest.

LSNRCTL for 32-bit Windows: Version 11.1.0.6.0 – Production on 14-JAN-2010 19:17:35
Copyright (c) 1991, 2007, Oracle. All rights reserved.
Welcome to LSNRCTL, type “help” for information.
LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
STATUS of the LISTENER
————————
Alias LISTENER
Version TNSLSNR for 32-bit Windows: Version 11.1.0.6.0 – Production
Start Date 14-JAN-2010 17:58:41
Uptime 0 days 1 hr. 18 min. 58 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File C:appXPMUserproduct11.1.0db_1networkadminlistener.ora
Listener Log File c:appxpmuserdiagtnslsnrVirtualXP-19744listeneralertlog.xml
Listening Endpoints Summary…
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\.pipeEXTPROC1521ipc)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=VirtualXP-19744)(PORT=1521)))
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

= = = = = = = = = = = =

These are the cofig files:

# listener.ora Network Configuration File: C:appXPMUserproduct11.1.0db_1networkadminlistener.ora
# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = VirtualXP-19744)(PORT = 1521))
)
)

# tnsnames.ora Network Configuration File: C:appXPMUserproduct11.1.0db_1networkadmintnsnames.ora
# Generated by Oracle configuration tools.
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = VirtualXP-19744)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)

status

and post the results.

If possible, post the contents of your listener.ora file as well.

Sorry, I had not understood that telnetting on port 1521 will try to talk to Oracle, which I could have guessed of course. And yes the db was not running, since I start the services only manually with a script, when I need them.

After having started them

C:>net start
These Windows services are started:
…
…
OracleOraDb11g_home1TNSListener
OracleServiceORCL

and

C:>LSNRCTL
LSNRCTL for 32-bit Windows: Version 11.1.0.6.0 – Production on 13-JAN-2010 20:39:40
Copyright (c) 1991, 2007, Oracle. All rights reserved.
Welcome to LSNRCTL, type “help” for information.

… and when trying a telnet connection to the VM on port 1521 it doesn’t come back right away with an error message as it did before but says only after quite a few seconds of
Connecting To 192.168.1.21…
Press any key to continue…
followed by
Connection to host lost.

I take that for a postive sign, that 2 programs actively try talking to each other, but don’t make it. But there is at least connection.

Does that help for the diagnosis?

If you can ping the machine, and no firewall is turned on, and the database is up, but you can’t telnet to port 1521, then I can only think of 2 possibilities:

-The listener is not running.
-The listener is configured to listen on a port different than 1521.

Uste the LSNRCTL tool to check the listener status, and check the port configured in your listener.ora file.

But the telnet connection fails:
Microsoft Telnet> open 192.168.1.21 1521
Connecting To 192.168.1.21…Could not open connection to the host, on port 1521
: Connect failed

This remains the case when both firewalls are turned off.

Are you using the ‘Basic’ tab when setting your connection in Sql Developer ?

Now when using the active WLAN Adapter in the VM configuration. The pings get answered in both directions — Normal you will say but big progress for me.

Then I try to connect from SQL Developer to Oracle on the VM using the VM’s ip address as hostname. But still: Network adapter could not connect.

A thought: could it be due to the fact that Oracle on the VM is 32 bit whereas SQL Developer is 64 bit?