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Support Tip: DirectAccess clients cannot connect to corporate IPv4 resources after installing UAG SP3 – DNS64 service not running

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toolsignThere is an issue that may arise after the installation of UAG Service Pack 3 on Forefront UAG acting as a DirectAccess server. After the installation, DirectAccess clients may not be able to connect to corporate intranet resources which are provisioned with only IPv4 addresses.

This problem occurs because the Microsoft Forefront UAG DNS64 service is not running on the DirectAccess server. This service provides DNS translation of IPv4 A records to IPv6 AAAA records required for DirectAccess client access. During the installation of UAG SP3, this service is stopped and the startup type is set to MANUAL. The service startup type should be AUTOMATIC and the service should be running when DirectAccess is enabled on the UAG server.

After installing UAG SP3 (or UAG SP3 Rollup 1) on a Forefront UAG server acting as a DirectAccess server ensure the DNS64 service is set to AUTOMATIC and started.

Using integrated NAT64 and DNS64 with Forefront UAG DirectAccess

Deep Dive Into DirectAccess – NAT64 and DNS64 In Action

J.C. Hornbeck | Knowledge Engineer | Microsoft GBS Management and Security Division

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    May 16, 2014
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    July 21, 2014
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