After editing the HTML files $FWDIR/conf/ahclientd/ahclientd*.html on the Security Gateway, customized HTML pages for Legacy Client Authentication are not displayed.
After enabling generation of core dump files per sk92764 / sk53363, core dump files for 'in.ahclientd' process were generated in the /var/log/dump/usermode/ directory.
Cause
The in.ahclientd process crashes if the size of the involved HTML file ($FWDIR/conf/ahclientd/ahclientd*.html) exceeds 4 kilobytes.