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What Are Server Publishing Rules
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Web publishing and secure Web publishing rules can grant access only to Web servers using HTTP or HTTPS. To grant access to internal resources using any other protocol, you must configure server publishing rules. When you create a server publishing rule, you are configuring ISA Server to listen for client requests using a particular port number. When ISA Server receives a request on the external interface for that port, it checks the server publishing rule to determine which internal server is providing the service. ISA Server then passes the request to the internal server. The internal server responds to the client request, forwarding the response to ISA Server, which forwards the response to the client.
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Implementing ISA Server Publishing
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Server publishing rules to provide the following functionality:
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Access to multiple protocols Server publishing rules provide access to protocols that Web publishing rules cannot. Web publishing rules can only publish servers using HTTP or HTTPS; for all other protocols, you must use a server publishing rule. ISA Server is configured in advance with a variety of protocol definitions for commonly used protocols that can be incorporated within server publishing rules. You can also create custom protocol definitions. Any protocol definition in which the primary connection is defined as inbound can be used for a server publishing rule. Application-layer filtering for specified protocols Application-layer filtering enables ISA Server to inspect the application data in each packet passing through ISA Server. ISA Server can apply application-layer inspection for server publishing when an application filter is registered for a specific protocol. For all other network traffic, ISA Server can apply packet and stateful filtering. ISA Server cannot inspect incoming SSL packets for servers published by server publishing rules. Support for encryption Some of the protocol definitions provided with ISA Server are secure protocols. For example, ISA Server includes definitions for secure Internet Message Access Protocol (IMAPS) and secure Post Office Protocol (POPS). When a server publishing rule is configured to use these protocols, ISA Server can forward encrypted data between the client computer and the internal published server. IP address logging for the client computer By default, when you publish a server using server publishing rule, the source IP address that is received by the internal server is the IP address of the client computer on the Internet.
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Considerations for Configuring DNS for Web and Server Publishing
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One of the complicating considerations when publishing internal Web servers as well as other servers to the Internet is DNS name resolution. Often, clients from the internal network, as well as clients from the Internet, must connect to the same internal server using the same DNS name. However, the internal clients usually need to connect to a different IP address than the external clients.
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One of the more common reasons for Web publishing rule failures is DNS resolution errors. If you see an exam question in which users on one network can access a resource using the fully qualified domain name (FQDN) but users on another network cannot, check the DNS resolution configuration. Because some users can access the server, you know that the server is functional; therefore, the problem may be name resolution. If name resolution seems to be set up correctly, check the publishing rule configuration.
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For example, you may have a corporate Web server located on a perimeter network that needs to be accessible to both internal users and Internet users. A possible config-
Lesson 1
Introduction to Publishing
uration is shown in Figure 8-1. In this configuration, a route configuration is configured between the internal network and the perimeter network, so when the internal clients try to access www.cohovineyard.com, they must connect to the IP address of 172.16.10.1. However, users from the Internet must access www.cohovineyard.com by connecting to the external network interface on the ISA Server computer (131.107.1.1). ISA Server then uses a Web publishing rule to provide access to the corporate Web server. The solution to providing access to the same server using two different IP addresses is to deploy a split DNS.
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