Exchange 2010 EdgeSync Failed, Can't connect to LDAP

Hi Guys,
I'm currently trying to check my edgesync and it's failing because it can't contact the LDAP service. I've disabled the firewalls on my AD server, my exchange server and my Edge server.
AD LDS and IIS are installed. I'm on edge as local administrator in workgroup computer.
The certificates on my edge and exchange aren't identical. I've created and copied the XML files across and imported it from the HT server in edge subscriptions.
I can't understand how it can't connect given that all servers can ping eachother and the firewalls are all disabled. Can anybody advise anything I can do to test ports being blocked in case some service is reserving those ports?
Many thanks,
Elliot

Hi,
I have created a test environment to deploy Exchange 2013 sp1 and I get same problem.
I have disabled IPv6 on DNS (in my case also AD)  server and edge server and I was able to configure everything properly.
Mihai  

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