Dear exchlist; Maybe this is a silly question, but i'm very curious about this... I have 1 exchange server 5.5 sp4 + Web server (IIS4) and the server have 2 NIC... first IP used to local connection and second IP used to internet connection. but i have a problem, when i access OWA via local connection, it works, but if i want to access OWA via internet connection it doesn't work. not only OWA, just access web server via internet connection doesn't work too..... 2 weeks ago, i could access via public_ip, but i don't know it's not working now...maybe i did a mistake until it doesn't work anymore... http://local_ip/exchange (it works) http://public_ip/exchange (it doesn't work) what should i do if i will be able to access OWA via public_ip.. any suggest will be appreciated...... Thank you AMos