You are using Internet Protocol security (IPsec) tunnels to
connect remote sites to each other on a Microsoft Windows Server 2003-based
computer that is running Microsoft Internet Security and Acceleration (ISA)
Server 2004. When you or a user on another computer try to browse Web servers
on the remote sites through the IPsec tunnels, you cannot browse the Web
servers. All other traffic crosses the tunnels to and from the remote sites
correctly.
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This behavior may occur if you use a non-primary IP address
as the local endpoint for an IPsec tunnel that connects the remote site
networks. The following configurations are not supported in ISA Server 2004:
| • | Network address translation (NAT) cannot be used as part of
the connection between an internal network and a remote site network. Network
traffic that is initiated from an internal network to a remote site network
will not connect as expected. |
| • | A Web Proxy cannot be used as part of the connection
between an internal network and a remote site network. |
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To resolve this behavior, follow these steps:
| 1. | When you connect multiple IPsec remote site networks to the
same Microsoft Windows Server 2003 based-computer that is running ISA Server
2004, define a unique IP address for each local endpoint of each IPsec tunnel
on the remote site networks.
For additional information about how to
define a unique IP address for the local endpoint of an IPsec tunnel, visit the
"To specify an IPsec tunnel" Web page on the following Microsoft Web site: |
| 2. | HTTP traffic can be enabled by defining a new protocol
that is not configured for the Web Proxy application filter. For example,
define a new protocol named HTTP1. Use the new protocol in a rule that enables
HTTP traffic to the specific remote site network. If multiple IPsec remote site
networks require NAT/HTTP functionality, use a dedicated network adaptor for
each remote site network. Use the primary IP address on the network adaptor as
the local endpoint.
For additional information about how to create a
protocol definition, visit the "To create a protocol definition" Web page on
the following Microsoft Web site: |
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For more information about connecting remote sites, visit
the "Connecting Remote Sites" Web page on the following Microsoft Web site:
For more information about IPsec Tunneling, visit the "What Is
IPsec Tunneling?" Web page on the following Microsoft Web site:
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