You cannot use RPC over HTTP with a proxy automatic configuration script
SYMPTOMS You cannot connect to Microsoft Exchange through the
Internet by using remote procedure call (RPC) over Hypertext Transfer Protocol
(HTTP). CAUSEThis problem occurs because Outlook 2003 does not correctly
detect the settings in the Local Area Network (LAN) Settings
dialog box when you connect to Microsoft Exchange through the Internet by using
RPC over HTTP if the following conditions are true:
WORKAROUNDCaution Before changing any settings so that you can use HTTP to connect
to your Microsoft Exchange Server mailbox, contact your Exchange server
administrator. To work around this problem, specify both the proxy server and the port number in the Local Area Network (LAN) Settings dialog box in Microsoft Internet Explorer. To do this, follow these steps. Note Contact your Exchange server administrator to obtain the information to complete these steps. For example, you must know the automatic configuration script and the correct name of your proxy server and port number.
RESOLUTION
This problem was corrected in Microsoft Windows XP Service Pack 2.
MORE INFORMATION In a local area network (LAN) environment, Microsoft
Outlook communicates with the Microsoft Exchange server by using remote RPC
with TCP/IP. This method provides quick, efficient access for a corporate
network. However, in previous versions of both Exchange server and Outlook,
access to an Exchange server by remote users required a virtual private network
(VPN) connection to the corporate network. A VPN provides a remote user with a
connection in an organization's corporate network and within its firewall. A
VPN enables access to more network services than is required for just e-mail
access. For remote connections, Outlook now offers an alternative to VPN connections. Outlook can connect to an Exchange server through the Internet by using RPC over HTTP. This feature allows you to remotely access your Exchange server account from the Internet when you are working outside your organization’s firewall without any special connections or hardware, such as smart cards and security tokens. There are several minimum requirements to use this feature. These include the following requirements:
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