You are experiencing an issue with the Schemus LDAP Synchronization Tool hanging while attempting to connect to Active Directory after LDAP section in setting up a new configuration or importing a configuration from a previous install.
This issue only affects version 1.39. The first recommendation is to update to the most current version of the Schemus LDAP Synchronization Tool which is available in the Symantec.cloud portal.
If this is not possible, the following solution should resolve the issue.