Conditional Forwarders no working after few hours

We've registered a domain "abc.com", and an email server with IP 192.168.x.x and 220.x.x.x which hosted the email of "abc.com".

Our internal DNS server hosted 2 domain, one is "company.com", another one is "abc.com", the A record of "smtp.abc.com" has been added (192.168.x.x), and the people out of company will resolve "smtp.abc.com" to 220.x.x.x using public DNS server.

A turreted domain which add a conditional forwarder of "abc.com" to our internal DNS server, because our AD is "company.com", not "abc.com", "non-auth" is shown next to the IP of internal DNS server.

The conditional forwarder work few hours, it can resolve smtp.abc.com to internal IP address 192.168.x.x. After few hours, it resolve 220.x.x.x. I need to delete the forwarder and recreate it.

Why the conditional forwarders only work for few hours?


August 23rd, 2015 10:23pm

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