関連ワード:  linux error 111 connection refused    linux error 111 connection refused oracle listener    linux error 111 connection refused lsnrctl status    linux errno 111 connection refused    oracle linux error 111 connection refused    lsnrctl linux error 111 connection refused    listener linux error 111 connection refused    tns 00511 no listener linux error 111 connection refused    error code 111 connection refused    what is connection refused error