Comments on: ora-12541; TNS No listener error http://itknowledgeexchange.techtarget.com/itanswers/ora-12541/ Sun, 19 May 2013 03:14:28 +0000 hourly 1 By: stevekorea http://itknowledgeexchange.techtarget.com/itanswers/ora-12541/#comment-81177 stevekorea Sun, 05 Sep 2010 03:18:34 +0000 #comment-81177 When the listener shut down abnormally or your connection is disconnected due to some reasons then you can receive such an error.
Check if the Oracle listener is still alive or reconnenct to database again.
and one more… check TNSnames.ora file (ip address, tnsport, etc)

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