-70: Session inactivity timeout (Work rolled back) 

Explanation:

The user's transaction was implicitly canceled and reset by a ROLLBACK statement. The database session was implicitly terminated, because the user failed to carry out any operations on the database system during the period of time specified by the timeout value.

User Action:

Repeat the CONNECT statement, maybe specifying a higher timeout value.

It may also be necessary to check and modify the value of the special database parameter SESSION_TIMEOUT.