Oracle client ORA-12541 TNS no listener

Question

I am new on Oracle database  but I have one issue   On my Database server  server1  listener and database instance run correctly and I can use sqlplus to connect to this DB  When I connect to database by using other server  I check the TNS configuration and it is correct but system says                                        ERROR  ORA-12541  TNS no listener    My database is Oracle 10gR2  So how can I solve this issue

User · Answer

According to oracle online documentation

ORA-12541: TNS:no listener

Cause: The connection request could not be completed because the listener is not running.

Action: Ensure that the supplied destination address matches one of the addresses used by 
the listener - compare the TNSNAMES.ORA entry with the appropriate LISTENER.ORA file (or  
TNSNAV.ORA if the connection is to go by way of an Interchange). Start the listener on 
the remote machine.

User · Answer

I also faced the same problem but I resolved the issue by starting the TNS listener in control panel -  administrative tools -  services - oracle TNS listener start I am using windows Xp and Toad to connect to Oracle

User · Answer

You need to set oracle to listen on all ip addresses  by default  it listens only to localhost connections    Step 1 - Edit listener ora  This file is located in    Windows   ORACLE HOME  network admin listener ora  Linux   ORACLE HOME network admin listener ora   Replace localhost with 0 0 0 0          LISTENER      DESCRIPTION LIST        DESCRIPTION          ADDRESS    PROTOCOL   IPC  KEY   EXTPROC1521          ADDRESS    PROTOCOL   TCP  HOST   0 0 0 0  PORT   1521                      Step 2 - Restart Oracle services   Windows  WinKey   r  services msc  Linux  CentOs    sudo systemctl restart oracle-xe

User · Answer

Check out your TNS Names  this must not have spaces at the left side of the ALIAS  Best regards

[oracle] Oracle client ORA-12541: TNS:no listener

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