If DNS is not working, the administration server will display the following warning message in a console window:
***Can't find server name for address <ip_address>: No response from server. ***Default servers are not available
In addition, a java exception stack will be displayed and users will not be able to send mail until the DNS is once again operating.
The administration server does not itself depend on the DNS server--it can continue to operate and an Admin Console can connect to it. But the DNS server needs to be returned to normal operation before mail can be sent.