Xtream UI generates logs in several locations, the most important being /home/xtreamcodes/iptv_panel/logs/streaming.log for stream issues and error.log for PHP-related problems. For example, a 403 in streaming.log might indicate an IP block, while a 500 in error.log could mean a PHP misconfiguration. Always cross-reference timestamps to correlate issues. Enabling verbose FFmpeg logging with -loglevel debug in your stream command can also help pinpoint transcoding issues.