The network adapter could not establish the connection after hostname chang

Question

hi all,
my computer name and ip address are changed after it is moved to another location in a local lan network. however, when i tried to connect my database in oralce 11g (enterprise edition) after, i got this error "the network adapter could not establish the connection" (in sql developer)
and "Configuring database with database control requires a listener to be configured in the current oracle home. You need run Netca to configure a listener before you can proceed. Otherwise you may choose to continue with database control" (in dbca when i tried to create a new database). i also cannot access my database in OEM becasue it is still refering to old host name with this error message "Firefox can't establish a connection to the server at...". i changed the old host name to the new host name in files of listener.ora, listener1212114PM3012.bak, tnsnames.ora, and tnsnames1212114PM3012.bak in folder 'product\11.2.0\dbhome_2\NETWORK\ADMIN'. but it didn't work. can anybody pls tell me what do i need to do to fix the problem. i don't want to reinstall my oracle again because i've done a lot of works already in oracle. thanks in advance.
kind regards,
hong

Answer 1

hi,
C:\>lsnrctl start
LSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 12-DEC-2012 11:44
:05
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Starting tnslsnr: please wait...
TNS-12560: TNS:protocol adapter error
TNS-00530: Protocol adapter error
C:\>lsnrctl status
LSNRCTL for 64-bit Windows: Version 11.2.0.1.0 - Production on 12-DEC-2012 11:46
:29
Copyright (c) 1991, 2010, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=pc-412-0.xx.xxxx.xxx.xx)
(PORT=1521)))
TNS-12545: Connect failed because target host or object does not exist
TNS-12560: TNS:protocol adapter error
TNS-00515: Connect failed because target host or object does not exist
64-bit Windows Error: 1004: Unknown error
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1521)))
TNS-12541: TNS:no listener
TNS-12560: TNS:protocol adapter error
TNS-00511: No listener
64-bit Windows Error: 2: No such file or directory
SQL> startup
ORA-01081: cannot start already-running ORACLE - shut it down first
Then I shutdown it and startup again. The new message is as follows:
SQL> startup
ORACLE instance started.
Total System Global Area 3373858816 bytes
Fixed Size 2180424 bytes
Variable Size 2097154744 bytes
Database Buffers 1258291200 bytes
Redo Buffers 16232448 bytes
Database mounted.
Database opened.
I tried to connect the database again and it didn't work. Thanks.
Hong