I have two servers in this set up. AD and EX, the domain is called mydomain.net

  • The AD is a Windows 2008 Server (32 bit) with Active Directory installed
  • AD only has it's own ip in the DNS-servers list
  • AD.mydomain.net does resolve correctly in the dns
  • EX is a Windows 2008 R2 that is connected to the mydomain.net-domain
  • EX only DNS server is the ip of the ad.mydomain.net
  • There are no firewalls running between the two servers

When trying to install Lync 2010 on the EX server I get the following error "Not available :Failure occurred attempting to check the schema state.Please ensure Active Directory is reachable."

I can control the AD from EX, also login to it and do successful checks like

netdom query /domain:mydomain.net fsmo

...that resolves correctly

I suspect there is something fundamentally wrong with my setup, maybe Lync need a 2k8 R2 ad?

  • Seems as if I made a typo, but all firewalls are down – Eric Herlitz Jul 5 '12 at 20:43
  • 2
    Lync requires schema extension. Have you defined a site in sites and services and associated the subnet to it? You also need to run the setup as a user with rights to perform a schema upgrade. – SpacemanSpiff Jul 5 '12 at 20:44
  • Oh and if you plan to make Lync accessible externally you will need a third server unless you plan to use VPN. You may also run into collisions in IIS here. – SpacemanSpiff Jul 5 '12 at 20:45
  • Where do I start with Schema extension? – Eric Herlitz Jul 5 '12 at 21:06

I had to obtain and run the extadsch.exe from the Microsoft System Center 2012 Configuration Manager on my Domain Controller.

  • Interesting, but I have never had to use a different product to install Lync. I sincerely hope this is a test environment. You're collocating too many functions. – SpacemanSpiff Jul 7 '12 at 15:06
  • It is for testing and development. Im setting up a local environment since it would be to risky to develop with the production environment. – Eric Herlitz Jul 7 '12 at 21:42
  • @Trikks Still. Ever since virtualization is around. A 32gb memory server for dev virtual machines costs nothing. – TomTom Jan 25 '13 at 8:18

I was getting same error but I was successful to resolve this issue. Actually you are login as a local user, Please log in to server as a user which is defined in your active directory server in such a way user@domian.

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