Windows & the text or non-XML listener log
It's important to routinely check the size of the text version of the listener log on Windows in Oracle versions 11g and later.
The default location for this file is:
$ORACLE_BASE/diag/tnslsnr/<your_host>/<listener_name>/trace/
This file isn't purged automatically. It can grow very large if it is not routinely purged or saved off.
If it reaches 4g in size on a FAT32 file system , it can cause an outage for remote clients.
See the following;
WINDOWS: Listener Hangs & Lsnrctl Commands Are Slow or Hang (Doc ID 1319797.1)
How To Change the Listener Log Filename Without Stopping the Listener (