ISSUE
Unable to login to UI using AD creds after successfully setting up under Users. When looking in the /var/log/httpd/ssl_error_log file, the following error was seen:
PHP Warning: ldap_bind(): Unable to bind to server: Strong(er) authentication required in
RESOLUTION
LDAP/Active Directory authentication issue
The following Group Policy settings needed to be modified to match the working AD DCs for logons to work with an AD account and the Unitrends appliance.
Local Computer Policy
└ - - Computer Configuration
└ - - - - Windows Settings
└ - - - - Security Settings
└ - - - - Local Policies
└ - - - - Security Options
Set to 'None' >>> └ - - - - Network security: LDAP client signing requirements
Default Domain Controller Policy
└ - - Computer Configuration
└ - - - - Windows Settings
└ - - - - Security Settings
└ - - - - Local Policies
└ - - - - Security Options
Set to 'None' >>> └ - - - - Domain Controller: LDAP server signing requirements
TASKS
Please see Microsoft Document 935834 "How to enable LDAP signing in Windows Server
https://support.microsoft.com/en-us/help/935834/how-to-enable-ldap-signing-in-windows-server
Network security: LDAP client signing requirements
Domain Controller: LDAP server signing requirements