I'm no longer able to log into an oracle database I had set up weeks ago, and I need some help troubleshooting. I'm very new to this, I'd appreciate any help with terminology as well as helping identify a cause or solution.

I'm unable to log into my database named ORCL through SQL Plus or the Enterprise Manager Console. When I supply a username, password, and host I receive "ORA-12541: TNS:no listener".

I checked the listener status and receive this:

LSNRCTL> status
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
32-bit Windows Error: 2: No such file or directory
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=fullcomputername)(PORT=1521)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
32-bit Windows Error: 61: Unknown error
LSNRCTL>

I checked the listener.log file, and think it appears to have failed a few days after my installation. See below log:

28-JUN-2008 23:55:15 * ping * 0
28-JUN-2008 23:55:15 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=)(USER=SYSTEM))(COMMAND=status)(ARGUMENTS=64)(SERVICE=(ADDRESS=(P ROTOCOL=TCP)(HOST=fullcomputername)(PORT=1521)))(VERSION=169869568)) * status * 0
28-JUN-2008 23:55:22 * (CONNECT_DATA=(SID=orcl)(CID=(PROGRAM=C:\oracle\product\10.2.0\db_1\perl\5.8.3\bin\MSWin32-x86-multi-thread\perl.exe)(HOST=fullcomputername)(USER=SYSTEM))) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=2462)) * establish * orcl * 0
28-JUN-2008 23:55:22 * service_update * orcl * 0
28-JUN-2008 23:59:22 * service_update * orcl * 0
28-JUN-2008 23:59:41 * (CONNECT_DATA=(SID=orcl)(CID=(PROGRAM=C:\oracle\product\10.2.0\db_1\bin\emagent.exe)(HOST=fullcomput ername)(USER=OraUser))) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=2496)) * establish * orcl * 12518
TNS-12518: TNS:listener could not hand off client connection
TNS-12560: TNS:protocol adapter error
TNS-00530: Protocol adapter error
32-bit Windows Error: 2: No such file or directory
28-JUN-2008 23:59:41 * service_died * orcl * 12547
TNS-12547: TNS:lost contact
28-JUN-2008 23:59:56 * (CONNECT_DATA=(SID=orcl)(CID=(PROGRAM=C:\oracle\product\10.2.0\db_1\bin\emagent.exe)(HOST=fullcomput ername)(USER=OraUser))) * (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PORT=2498)) * establish * orcl * 12505
TNS-12505: TNS:listener does not currently know of SID given in connect descriptor

TNSLSNR for 32-bit Windows: Version 10.2.0.1.0 - Production on 29-JUN-2008 00:44:42

Copyright (c) 1991, 2005, Oracle. All rights reserved.

System parameter file is C:\oracle\product\10.2.0\db_1\network\admin\listener.ora
Log messages written to C:\oracle\product\10.2.0\db_1\network\log\listener.log
Trace information written to C:\oracle\product\10.2.0\db_1\network\trace\listener.trc
Trace level is currently 0

Started with pid=428
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))
Error listening on: (ADDRESS=(PROTOCOL=tcp)(HOST=127.0.0.1)(PARTIAL=yes)(QUEUESIZE=1))
No longer listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1ipc)))
TNS-12560: TNS:protocol adapter error
TNS-00583: Valid node checking: unable to parse configuration parameters


I'm not too sure what other information is relevant, I'd appreciate any and all help. What can I check and test?

Regards