Hi all, I'm running Exchange 5.5 SP4 on WinNT4 in a DMZ behind a Checkpoint VPN-1 firewall. The server has it's own external IP and no NAT is used. I have this challenge: When people use Outlook Web Access from anywhere on the internet (such as internet cafe, other company LANs, or on dial-up), everything works fine, as long as they don't connect through a proxy. I have noticed this to happen with every proxy server I have tried. (Netscape, MS Proxy/ISA, WinRoute proxy). This is what happens: User opens web browser (IE5 or IE6 on Win2K Prof) and enters the OWA address... Everything's fine till here. OWA page comes up, user enters mailbox alias name, clicks on the 'click here' text. A blank page shows up. The address is http://[WEB_IP_ADDRESS]/exchange/LogonFrm.asp?isnewwindow=0&mailbox=[ALIAS_N AME] The HTML code of this blank page is the following: <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=windows-1252"></HEAD> <BODY></BODY></HTML> If I look at the proxy log, here is the line that shows up as soon as I click on 'Click Here': 192.168.x.xxx -- [20/feb/2002:15:45:12 +0100] "GET http://[WEB_IP_ADDRESS]/exchange/LogonFrm.asp?isnewwindow=0&mailbox=andreac HTTP/1.1" 401 0 The '401' is the returned error code, which is 'access denied'... Although I'm never asked for logon credentials.. Any ideas? Mr. Andrea Coppini +49 163 5 ANDREA (263732) andreacoppini@xxxxxxxx EMPOWER PEOPLE - THE WORLD IN YOUR HAND! iWG (iWORLD Group) is a global e-mobile(TM) company creating, building and growing new businesses. iWG founders are pioneers in creating multi-billion dollar mobile and Internet businesses in Europe, Asia and the US. The Global Partners include shareholders like Bank of America, Deutsche Bank, Hikari Tsushin, McCaw, PaineWebber/UBS, The Dolphins' Trust, Perikles Trust and the iAA Advisory Network. http://www.iWG.info http://www.countryprofiler.com/Malta/ Privileged/Confidential Information may be contained in this message. If you are not the addressee indicated in this message (or responsible for delivery of the message to such person), you may not copy or deliver this message to anyone. In such case, you should destroy this message and kindly notify the sender by reply email.