Packets blocked despite IP Filter...

From: "Alfonso Lopez de Ayala" <alopezdeayala@xxxxxxxxxxxx>
To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
Date: Mon, 30 Sep 2002 09:40:31 -0700

Can't figure out this one?  Am I overlooking something way basic?

To allow server (W32Time service) to synchronize time with external SNTP
server (the famous tock.usno.navy.mil at 192.5.41.41) I have set up the
following IP Packet Filter:

------------------------------
Filter Type:
     IP Protocol: UDP
     Direction: Send receive
     Local port: All ports
     Remote port: Fixed port
     Remote port number: 123

This computer:
     This ISA server's external IP address: wwww.xxx.yyy.zzz


Remote computer:
     This remote computer: 192.5.41.41
------------------------------

Then in the Firewall logs I see the packets to UDP port 123 blocked:
 
Date:           2002-09-30
Time:           02:44:20
Source-ip:      wwww.xxx.yyy.zzz
Destination-ip: 192.5.41.41
Protocol:       Udp
Param#1:        50111
Param#2         123
Filter rule:    BLOCKED
Interface:      wwww.xxx.yyy.zzz

Why is it blocking them???

Packets blocked despite IP Filter...

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