EdgeSync service cannot connect to this subscription because of error "The LDAP server is unavailable"

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Scenario:

Environment: Exchange 2016/2013

Test-EdgeSynchronization fails with below error

FailureDetail : EdgeSync service cannot connect to this subscription because of error "The LDAP server is unavailable.".

Cause:

The same third-party certificate is installed on both the Hub and Edge Transport servers. By default, Microsoft Exchange uses a self-signed certificate installed by Microsoft Exchange instead of using a third-party custom certificate. While it is possible to install and use third-party certificates, you can't install the same certificate on the Hub and Edge Transport servers.

Resolution:

  • Remove the third-party certificate from the Edge Transport server
  • Install a self-signed certificate on the Edge Transport server
  • Re-create the Edge subscription