ISA was working fine -- and now suddenly every 7 minutes or so the ISA Server Control service adds the following two entries to the Windows Application Log. Haven't really changed the LAT or routing table. What can it be? Information - Event ID 14189 - ISA Server detected that a change was made in the local address table (LAT) Error - Event ID: 14123 - Failed to create the Internet Protocol (IP) packet filter. For more information see ISA Server help.