Pass rule sometimes does not work

["Hess, Ben" <ben.hess () techalliancegroup com>]

I have a web server that allows use of the CGI calendar feature on some of
the web sites. I wrote a pass rule that should allow the traffic to not be
picked up but every so often I get an alert from one of the allowed
addresses. Does anyone know where I should look to troubleshoot this issue?

Ben