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no listener [message #681507] Sat, 25 July 2020 05:52 Go to next message
oracle@learner
Messages: 73
Registered: October 2011
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Unable to establish database connection.

Please check database configuration.

ORA-12541: TNS:no listener
Please help how to rectify the issue...
many thanks...
Re: no listener [message #681510 is a reply to message #681507] Sat, 25 July 2020 06:21 Go to previous messageGo to next message
Michel Cadot
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Registered: March 2007
Location: Nanterre, France, http://...
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1/ Check the listener is started
2/ Check you try to connect to what you actually want to connect: tnsnames entry and/or connect string.

Re: no listener [message #681516 is a reply to message #681507] Sat, 25 July 2020 10:07 Go to previous messageGo to next message
EdStevens
Messages: 1233
Registered: September 2013
Senior Member
And what did you discover when you googled "ORA-12541"?

Network connection issues are usually pretty simple, if you just take it one step at a time, starting with the requestor. And pay attention to the actual error message. Your error means one thing: when your request arrived at the specified server and port, there was no oracle listener active on that server and port.

So, what server and port was specified by the requestor? This can usually be seen by executing 'tnsping <dbname' on the requesting machine.
Re: no listener [message #681524 is a reply to message #681516] Mon, 27 July 2020 01:21 Go to previous messageGo to next message
oracle@learner
Messages: 73
Registered: October 2011
Member

Thanks, it is working now after reconfigured the listener from net config...

Is it a common problem in oracle when I google it, most users faced the same problem...
Re: no listener [message #681525 is a reply to message #681524] Mon, 27 July 2020 02:20 Go to previous messageGo to next message
Michel Cadot
Messages: 67303
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator

Quote:
most users faced the same problem...
What problem?
I had never used net config (and I work with Oracle since version 4, of course net config didn't exist at this time) and had never any problem with that.

Re: no listener [message #681529 is a reply to message #681524] Mon, 27 July 2020 06:21 Go to previous message
EdStevens
Messages: 1233
Registered: September 2013
Senior Member
oracle@learner wrote on Mon, 27 July 2020 01:21
Thanks, it is working now after reconfigured the listener from net config...

Is it a common problem in oracle when I google it, most users faced the same problem...
Then obviously your listener had been incorrectly configured (or was never actually running). But now we'll never know.
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