Apache Web Server log files are stored under the following directory:
<install_dir>/httpd/logs
Note: To ensure proper operation of Project Portal 2015, the Project Portal error logs should be monitored (browsed through from time to time). These logs include the web server error_log (file name followed by a date, to keep individual log size down), and /var/tmp/krono-hostname-port/debug/log/debug.stderr.