Unable to connect to the domain controller in unsecured LDAP connection
Microsoft announced in its security advisory ADV190023, a change in behavior in the authentication mechanisms would be necessary in order to guarantee better security between AD DS / AD LDS services and their customers.
A Microsoft update postponed several times, finally expected for the second half of 2020 will cause the breakdown of communication between EyesOfNetwork and your domain controllers.
In order to maintain the connection between EyesOfNetwork and the domain controller, it is necessary to establish encrypted communication in LDAPs.
Knowledge base: Authentication in LDAPs on EyesOfNetwork