we have a dot net application and it connecting to Oracle and fetching data and moving to SQL server. it was working very fine. just started giving error ORA-12560: TNS:protocol adapter error . Tnsping also giving this error. but if i stop this application and tnsping then its success. again starting the application on the first 10 minutes its working perfectly and gain giving same error. every 5 seconds this application connecting to Oracle databse.

any idea what is this error; and how to resolve. there is lots of questions over here,but didnt find a soulution .

highly appreciate your comments against this query