Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Usenet -> c.d.o.server -> Re: ORA-12541, but listener IS running

Re: ORA-12541, but listener IS running

From: Sybrand Bakker <gooiditweg_at_sybrandb.verwijderdit.demon.nl>
Date: Fri, 16 Jul 2004 19:25:50 +0200
Message-ID: <pq3gf0hcd2bnsf4og8oi5toruqtin8rbg9@4ax.com>


On Fri, 16 Jul 2004 08:58:16 +0100, rc <rc_at_spam.com> wrote:

>On Thu, 15 Jul 2004 21:15:39 +0200, Sybrand Bakker
><sybrandb_at_hccnet.nl> wrote:
>
>>On 15 Jul 2004 11:27:14 -0700, fred_at_computrition.com (fred) wrote:
>>
>>>Just built a new linux box, installed a 10g database. I CAN connect to
>>>it using sqlplus when run on that very box.
>>>
>>>But from any other client machine I get the dreaded 12541, no
>>>listener, error.
>>>
>>>But the listener is running. netstat -a shows port 1521 listening. the
>>>listener shows in "ps ax | grep oracle". "lsnrctl status" says it is
>>>running.
>>>
>>>The linux firewall IS DISABLED. "/etc/rc.d/init.d/ipfilter status"
>>>shows that it is not running.
>>>
>>>running nmap against that machine from another linux box does NOT show
>>>port 1521 being open. running it against another oracle server does
>>>show it open.
>>>
>>>So, someone, somewhere, is blocking access to 1521 on the new box, but
>>>I can't figure out who/what/where. Suggestions please?
>>
>>
>>host = in listener.ora must match host= in tnsnames.ora, otherwise
>>you'll get 12541.
>
>I think when u rung SQL plus from the box it self, it uses the bequeth
>adapter, not the tns listner ( I think)
>

Not necessarily true
Applies only when ORACLE_SID has been set.

--
Sybrand Bakker, Senior Oracle DBA
Received on Fri Jul 16 2004 - 12:25:50 CDT

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US