Who is affected?
Anyone who uses OP5 Monitor with LDAP AD integration without SSL/TLS.
What has changed?
Microsoft has proposed changes to security policies first (1) around LDAP signing and second (2) LDAP channel binding. The reason behind this is to increase the security for communications between LDAP clients and Active Directory domain controllers.
Link to Microsoft announcement: https://support.microsoft.com/en-us/help/4520412/2020-ldap-channel-binding-and-ldap-signing-requirements-for-windows
How to fix it in OP5 Monitor?
When these changes have been implemented in the Microsoft environment you will have to enable LDAP over SSL/TLS in the OP5 Monitor authentication module.
For more information see
How to integrate Active Directory with OP5 Monitor
Certificate management for LDAP SSL (sldap) with Active Directory (Community submitted)