I have a comcast Business Router that is hooked into a Juniper SRX300 firewall. Then the Firewall is plugged into the Aruba 2530 Switch. The problem I experience is some of the endpoints will connect with no problem to web pages. And some will not saying the error is failed to connect DNS issue. Why would this only be on some computers and not all if it is a DNS issue? I'm completely dumfounded by this. Please advise. Also one laptop that is doing it on the network doesn't do it on another network.