Hi all,

I'm installing Lync server 2010 in windows server 2008.
DC-Physical server, Member Server-Virtual Server.

While preparing the schema, I have got an issue.
Failure occurred while attempting to check the schema state please ensure active directory is reachable.

Regards,

Arun.

Hi,

Verify the DNS server is working fine.

While logging in to system do you loged in using domain account or computer? verify the account you have loged in have permissions.

Please check the firewall settings on Lync server and the DC

http://jamiesmithnz.wordpress.com/2012/05/23/deploying-lync-server-2010-standard-edition-detailed-step-by-step/

To fix your issue, you need also verify from following

1. DNS, verify that DNS is working for servernames and AD PTR/SRV records This SRV record is: _ldap._tcp.pdc._msdcs. DnsDomainName
2. Verify that Schema Master is online and can be contacted from the Lync server
3. Verify that Schema Master is writeable
4. Verify Domain Controller replication (DCdiag)
5. Try to execute the prep on server where host the FSMO.
6. Verify that you are login on Lync Server with administrator member of Domain Admins & Schema Admins