ORA-12514 TNS:listener does not currently know of service requested in connect descriptor

Problem:

We have an application running locally which two days worked fine and now we get the: TNS:listener does not currently know of service requested in connect descriptor error.

I’ve tested the connection using TNSPing which resolved correctly and Tried SQLPlus to try connecting, which failed with the same error. (i.e. Sqlplus username/passowrd@addressname[or host name] The TNS Listener on the server is running. Oracle itself on the server is running. Continue reading

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