Hi everyone, I have this weird problem with a SBS 2003 server whereby from time to time (within the same day) the DNS server service will stop for no reason, no errors in the DNS event logs. Without this service, Exchange 2003 SMTP and ISA will fail and that is when user starts complaining. NSLOOKUP on the server console would not resolve names when this happens. Incoming mail and VPN are not affected as these services did not require DNS services from the server. ISA was configured for caching only as we have an external firewall. RRAS was installed using the Remote Access Wizard for external VPN access. I had setup quite a few SBS2003 servers with identical configuration and non of these servers gave me any grieve except this one. I have googled and try to find a solution but to no avail. Can someone please assist? Regards Hong Siew