Database Networking (MOSC)

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ORA-01034 and ORA-27101 when trying to connect from the server without specifying the TNS alias

edited Mar 7, 2013 6:52AM in Database Networking (MOSC) 7 commentsAnswered ✓
 Hi All,
I'm trying to understand why I'm getting ORA-01034 and ORA-27101 when trying to connect to the DB from SQL*Plus without specifying the TNS alias, but I'm short of leads now.
Everything worked fine before, but I was told somebody has made some changes somewhere (of course I don't know which ones), so I'm trying to find out what has been done.

To run application batches through SQL*plus we use an OS user different from oracle. The environment variables of this user are the same as oracle's (ORACLE_HOME, ORACLE_SID, PATH).
Before, running "sqlplus myOSuser" would connect properly to the DB. Now, the same command ends up with :

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