To enable debugging on the Ipsilon server you need to modify two settings in /etc/ipsilon/idp/ipsilon.conf:
[global] debug = True ... log.screen = True
After making these two changes you’ll need to restart the Apache web server:
# service httpd restart
The additional debug information will go into one of the Apache error lgos. On Fedora/RHEL/CentOS this is /var/log/httpd/ssl_error_log.