I lost hours trying to resolve this:

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

It requires lots of determination not to swear and rant about the possible causes of this message but in my case (Windows 7 64bits), it turns out that Toad doesn’t like to be installed in a folder with ‘()’s like ‘C:\Program Files (x86)’

I installed in C:\Toad\ and the problem is resolved.

Of course to reach there I had to resolve some other issues (for the same error message) like:
– Installing 32bits version of Oracle Client (
– Instant client didn’t work for me.

Hope it helps.

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