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from using these ports, and the AD LDS service start fails.
In Windows Server 2008 R2, AD LDS installation will recognize ports that are unavailable (And this includes those ports that DNS allocates), and the AD LDS installation will auto fill appropriate ports that are currently not being used. The AD LDS installation will not let you choose a port that is taken by another service for an AD LDS instance.
Multiple instances of AD LDS (ADAM) can be installed on one computer. Therefore, if you have more than 2 AD LDS instances on your computer, you will be covering more ports than the defaults (389, 636 and 50000, 50001).