not a support questionStarting Oracle 11g, architecture for trace file and log files have changed. Alert.log and listener.log files are now XML based.
To check listener log in 11g, following steps need to be done
$adrci
adrci> show homes
ADR Homes:
diag/tnslsnr/orcl11/listener
adrci> set home diag/tnslsnr/orcl11/listener
adrci> show tracefile
diag/tnslsnr/orcl11/listener/trace/listener.log
adrci> show trace listener.log
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