Can't get web management page working after installation

Hi guys!
I'm new of PROXMOX...
My problem is that I can't get web management page working after the installation of Proxmox VE 3.0 .
I installed it using default settings but when I try to access to the web page the browser don't show me any page.
I tried to use Mozzilla Firefox, Google Chrome and IE.
My Server specs are:
CPU: Phenom II x4 955
RAM: Corsair Vengeance 1600mhz CAS9 16gb
M/B: Asus Sabertooth 990fx
OS HDD: OCZ Agility 3 120gb
GPU: Sapphire AMD Radeon HD 6850 2gb
PSU: OCZ Fatal1ty 550W
I tried 2 different routers:
Linksys WAG160N
Netgear DG 834 v2 with custom firmware
Thank you so much!
Without your help I can't get anything working!
Thanks!!!;)