Perform a DNS TestHere are basic steps on how to test and verify status on DNS resolution from a ProxySG appliance.
This test required a DNS list to be configured on the ProxySG appliance under Management
Console > Configuration > Network > DNS > New.SSH to the ProxySG CLI, and issue the following command:
SG>test dns <Domain in question>
Typical ErrorThe following errors are commonly seen from a DNS test:

If you encounter any of the errors above (considering the domain in questions is valid), please contact your DNS admin to resolve the issue.
You may also want to view this
Basic DNS Troubleshooting in ProxySG