I'm posting a thread I started on the Apple Support Discussion boards because I've had many views, but no feedback. Any ideas would be helpful Let me start off by saying that I have set up an AirPort network at home. That went off without a hitch. I also have extended the range of my home network vie an AirPort Express - so I'm not stranger to setting up a network. In fact, upgrading the office network (which I manage) is the source of this question. I have a brand-new, just out of the box AirPort Extreme that I'm using to replace our old Belkin wireless router. Our set up consists of an 8-port Gigabit switch. This is uplinked to the wireless router. The fiber-optic connection comes in through the WAN port of the existing router. Upon swapping everything out and setting up the AirPort, I can not get it to access the internet via the WAN port. The previous Belkin setting for WAN access is "dynamic" - it might also be worth noting that when upgrading my home network, I moved from this same Belkin router to an AirPort Extreme. The only difference is that I have cable internet at home - but we have a fiber optic connection at the office. When viewing the "Internet" tab in the AirPort Utilitly it is set for DHCP - same as I run it at home. Yet it does not connect to my ISP. It's also worth noting that I have no problems pulling the plugs and putting them right back into the Belkin and bam, it connects right up. It sees my internet connection. It provides LAN and Wi-Fi access without a hitch. I'm a bit befuddled by this. Is there anything on the ISP end that would be causing this issue?