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

I know this questions with title like these are common, but I couldnt find solution on these and my question is bit different.

I'm trying to use login authenification via database via VPN. Oracle SQL Developer can connect perfectly using TNS, but c# app cant and I am getting this error (cant check if this is right error number right now, but problem is still same, I will check it tomorrow). I cant share login data from job, so any ideas what can be wrong are welcome.

Edit: I forgot to mention, I have seen just the bit of implementation, but we were trying to try connection via odbc and it didnt work either, just oracle sql developer was able to connect

Solution

Problem was in tsnnames.ora, some magic characters appeared somewhere

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