Error when trying to log in: ORA-12154

Question

I am using Oracle 10g and PL/SQL Developer for the development. I have already tested from Net Manager that the database can be connected to, but when I tried to connect with PL/SQL Developer there was problem that I do not understand:

ORA-12154: TNS:could not resolve the connect identifier specified

I have already searched for solution for the problem but still it can't be resolved. Any advice?

Answer 1

This was a hard one. tnsping works. tnsnames.ora is correct. This post solved it for me: http://sambitimes.blogspot.de/2010/10/ora-12154-error-in-windows-7.html

If installation path of PL/SQL-Developer contains brackets, it screws up... This will not work with win7: "C:\Program Files (x86)\PLSQL Developer"

this does for me: "C:\Program Files\PLSQL Developer"

I hope it helps for others.