Cause: A call to Oracle was attempted when no connection was established. Usually this
happens because a user-written program has not logged on. It may happen if communication
trouble causes a disconnection. In addition, this message could occur when ALTER SYSTEM
KILL SESSION or ALTER SYSTEM DISCONNECT SESSION were issued with the IMMEDIATE qualifier
because, in those cases, the client's connection to the database is terminated without
waiting for the client to issue a request.
Action: Try again. If the message recurs and the program is user written, check the