So - you are inside your LAN - attempting to connect to your own external IP address. I do not think that a router will let you do that... I'm not sure why, I just recall this coming up before. There may be a way to force it, but if all you need to do is test how things look/respond to others, surf back to yourself using a free proxy service.
System Manufacturer/Model Number Employer provided Dell E6430 OS W7 Pro SP1 64bit CPU i5 3320M @ 2.6GHz Motherboard 0CPWYR Memory 4GB Graphics Card Intel HD Graphics 4000 Screen Resolution 1600 x 900
Hard Drives 119GB LITEONIT SSD Antivirus Employer mandated Symantec Endpoint Protection Browser Firefox, IE9 & IE8 via VM
The problem is solved now. I think my DNS server was not properly updated...I see that directly entering an IP address instead of a hostname still goes through the DNS servers, due to the fact that I couldn't access my server with just the ip address (my external IP). I can now however use both hostname and external IP to visit my server from within my LAN network...