Hi,
We have an Ironport WSA 370 at a client which has a strange issue. Webpages fail to load if using the domain, but work if you try direct by IP. After a flushdns on the ironport, accessing pages via domain works fine - for a period. The client is having to flushdns at the start of the day, then repeat 2-3 times throughout the day.
I've tried using the DNS server on the Domain Controller, Google DNS, and the ISP dns. If you test via the CLI on the WSA, you can ping domain names without any issues which show dns resolution is working.
I tried upgrading to the latest version, and the issue persists.
Any ideas?