Don't laugh, still using W98SE and Kerio 2.1.5 Firewall. I just had an alert "Incoming IP protocol 46" and don't know whether I should Permit or Deny this. The only thing I could find about it was this: http://support.microsoft.com/kb/811832/ Not sure that I'm any the wiser and in any event this is not for W98. Any ideas which way I should go? Thx.