I am a junior in the security field. I received a ticket that one of my user couldn't get to a website (ex: greenrayindustries.com). I am located in California and able to access to it without a problem with my FW, but whomever aren't lived in Cali , the FW sometime blocks it sometime does not. I checked FW configuration and policy; they all were the same. I already check URL and it's not blacklist. I am not sure what should I do here. Any advise?