Hi Everybody: At least once a week, ISA appears to prevent external DNS Servers talking to our internal DNS Server. We host a primary DNS behind our ISA and on a regular basis, external secondary DNS servers are unable to refresh their records from our primary. A reboot of ISA will always cure this. When this happens, all other communication through ISA appears to be fine. I have applied SP1 but that has made no difference. Does anyone have any ideas? Regards Paul Gower Technical Director Paradisii Limited 64 High Street Lewes East Sussex BN7 1XG Tel: (01273) 470006 Fax: (01273) 470007 Mobile: (07973) 172650 http://www.paradisii.co.uk