Looks like its time for an update.
From the IPcop website: This release fixes some bugs, update glibc, Net::DNS and capi for security reasons. Upgraded packages are squid, snort, e100, r1000… As usual, this version can be installed as an update from previous v1.4.x versions or with a ready-to-go ISO or usb bootable images or pxe for a fresh install. Files are available on ‘IPCop’ package at Sourceforge.
Read the rest of the release for further details.
I had problems installing the update from 1.4.15, ended up doing the full install, theres a nifty backup mod on ipcops forum that allows you to backup/restore your whole ipcop (wish I’d known about this before).