TNS-12541 : Why use default port 1521 ?

Hi,
I just upgraded my base from 10.2.0.5 to 11.2.0.2.
I followed all steps from the SAP Marketplace : Upgrade to Oracle Database 11g Release 2 (11.2): UNIX
My database is upgraded and I need to perform post-upgrade tasks before updating my Client.
When I try to execute tnsping, i got this error :
Attempting to contact (DESCRIPTION=(CONNECT_DATA=(SERVICE_NAME=))(ADDRESS=(PROTOCOL=TCP)(HOST=10.66.XX.XX)(PORT=1521)))
TNS-12541: TNS:no listener
I can't understand why he's trying to contact port 1521 while my tnsnames and listener.ora are :
TNSNAMES.ORA :
tnsnames.ora Network Configuration File: /oracle/ST1/112_64/network/admin/tnsnames.ora
Generated by Oracle configuration tools.
ST1.WORLD =
(DESCRIPTION =
    (ADDRESS = (COMMUNITY = SAP.WORLD)(PROTOCOL = TCP)(HOST = ar3te017)(PORT = 1527))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = ST1)
Filename......: tnsnames.ora
Created.......: created by SAP AG, R/3 Rel. >= 4.0A
Name..........:
Date..........:
LISTENER_ST1.WORLD =
(ADDRESS = (COMMUNITY = SAP.WORLD)(PROTOCOL = TCP)(HOST = ar3te017)(PORT = 1527))
LISTENER .ORA :
Filename......: listener.ora
Created.......: created by SAP AG, R/3 Rel. >= 4.0A
Name..........:
Date..........:
LISTENER =
(ADDRESS_LIST =
        (ADDRESS=
          (PROTOCOL=IPC)
          (KEY= ST1.WORLD)
        (ADDRESS=
          (PROTOCOL=IPC)
          (KEY= ST1)
        (ADDRESS =
          (COMMUNITY = SAP.WORLD)
          (PROTOCOL = TCP)
          (HOST = ar3te017)
          (PORT = 1527)
STARTUP_WAIT_TIME_LISTENER = 0
CONNECT_TIMEOUT_LISTENER = 10
TRACE_LEVEL_LISTENER = OFF
SID_LIST_LISTENER =
(SID_LIST =
    (SID_DESC =
      (SDU = 32768)
      (SID_NAME = ST1)
      (ORACLE_HOME = /oracle/ST1/112_64)
So why contact port 1521 insted of 1527 ? Did I forget a file to modify ?
Thanks

Hi,
Check below thread where similar problem was discussed:
ORA-12514: TNS:listener does not currently know of service requested ..
Thanks
Sunny

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But while up gradation due to default scan port 1521 , 11.2.0.1 databases are not able to connect (remote connections)
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grdoratst104:/apps/grid/grdhome:+ASM4>
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Edited by: user12032334 on May 31, 2011 11:46 AM

Why are you using a non default port? It does not improve security. It makes network management more complex. And causes the type of issues that you are facing now.
So before changing defaults, make sure that your reasons are technically sound. And using port 1900 when 1521 is available, is not technically sound by any means.
As for addressing the problem you have created for yourself by mucking around with port numbers. Use a NAT firewall (on each RAC node) to rewrite packets headers received on port 1900 and send these to the server's port 1521 instead (on the VIP or static IP as required).
This can be fairly easily done using iptables if your o/s is Linux. You need to:
a) create a pre-routing NAT rule
b) create a post-routing NAT rule
c) create a forwarding filter rule for port 1900/tcp
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To know which application is actually using the listner port 1521

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TNS-12541 : Why use default port 1521 ?

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