my all workstations and servers shows internet connectivity. 100mbps
i can receive all emails from outside world and send email to outside world in my organization.
but i cannot open any websites like yahoo, hotmail OR any other site.
i checked my router, it works fine when connected directly to my laptop , i can open internet.
but as soon as i connect my router to my watch guard firewall my internet is not working
All my servers are connected to watchguard firewall through switch box.
my router- firewall-switch box (network ports)
i got it verified from watchguard technical , there is nothing wring in firewall policies or physical device itself.
But when i used google dns and comcast dns on my workstation then my internet works fine bypassing my internal dns server address so the problem has come to my dns server internally in my office.
what should i check in my dns server i have dns, dhcp, exchange, active directory on one server windows server 2008 sp2. i have exchange 2010 sp2 installed
my internal dns is not working correctly.
what should i do to correct the problem, i rebooted my exchange server which is having dns but it is not working.