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Source: Microsoft Support
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Certain websites that check IPv4 addresses to grant access, such as certain document libraries will not work over DirectAccess, as the corporate prefix will not match. In order to get around this limitation, the FQDN for each site should be added to the NRPT. Websites which verify users through their IPv4 addresses will not be accessible.
Windows DirectAccess works through IPv6 technologies. When accessing corporate networks through DirectAccess users will be behind home routers and will therefore not match the IPv4 address range of users on their corporation's network.
The IPv4 only websites will not be able to identify the users, and will therefore deny them access.
In order to get around this IPv4 limitation, the Fully Qualified Domain Name (FQDN) is placed in the Name Resolution Policy Table(NRPT) to force traffic through the corporate proxy. In order to configure this:
Navigate to Computer Configuration -> Windows Settings -> Name Resolution Policy
Select FQDN under "To which part of the namespace does this rule apply"
Enter the FQDN in the textbox next to it.
This is a manual process and must be done for each site of this nature, but has been tested and works smoothly.
If there are any DNS server and related settings that you need to force, select the tab "DNS Settings for Direct Access" and configure the DA Settings. Select the checkbox next to "Enable DNS Settings for Direct Access in this rule" to un-grey the options.
The Name Resolution Policy Table (NRPT) is a table of namespaces and settings stored in the registry that determines the client's DNS Query behavior. The NRPT can be edited using Group policy or through registry scripts.
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