Domain Controller Blocked Audit: Audit NTLM authentication to this domain controller. Secure Channel name: %1 User name: ...

Domain Controller Blocked Audit: Audit NTLM authentication to this domain controller.
Secure Channel name: %1
User name: %2
Domain name: %3
Workstation name: %4
Secure Channel type: %5

Audit NTLM authentication requests within the domain %3 that would be blocked if the security policy Network Security: Restrict NTLM: NTLM authentication in this domain is set to any of the Deny options.

If you want to allow NTLM authentication requests in the domain %3, set the security policy Network Security: Restrict NTLM: NTLM authentication in this domain to Disabled.

If you want to allow NTLM authentication requests to specific servers in the domain %3, set the security policy Network Security: Restrict NTLM: NTLM authentication in this domain to Deny for domain servers or Deny domain accounts to domain servers, and then set the security policy Network Security: Restrict NTLM: Add server exceptions in this domain to define a list of servers in the domain %3 to which clients are allowed to use NTLM authentication.