Scope How to disable TLS 1.3 for AD and LDAP in observed AD/DNS state

Use this document to resolve one bounded operational decision: Scope How to disable TLS 1.3 for AD and LDAP in observed AD/DNS state. Only the official source and traced locations below supply facts. Confirm applicability before acting.

Source fact:

The official How to disable TLS 1.3 for AD and LDAP from Microsoft supports the following bounded statements:

• At Introduction below H1, Microsoft states: “The Windows updates KB5014668 and KB5014665 add support for Transport Layer Security (TLS) 1.3 when using LDAP over SSL or issuing the StartTLS command.” The research record locates this support at Introduction below H1.
• At Introduction below H1, Microsoft states: “You may need to disable the TLS 1.3 support for compatibility reasons.” The research record locates this support at Introduction below H1.

These statements are the factual basis for this document. Do not extend them into a broader assurance. Review Active Directory objects, search bases, domain controllers, delegated roles, cmdlet parameters, and the DNS paths used to locate directory services only where the source and recorded environment align.

What the source does not establish

The cited page and retained statements do not establish the current state of any DSE or customer environment, prove that the documented configuration is applicable, or authorize a production change. Confirm supported versions, dependencies, and the current live source before use. No current deployment state or change approval follows from the source alone. Validate Active Directory replication, Windows DNS, domain-controller location, time, network reachability, privileges, and protected credentials, and treat examples or options as conditional inputs rather than defaults.

Applicability questions

• For source statement 1 at Introduction below H1, which observable configuration, record, or test can confirm applicability here?
• For source statement 2 at Introduction below H1, which observable configuration, record, or test can confirm applicability here?
• Which owner can attest to the recorded state of Active Directory objects, search bases, domain controllers, delegated roles, cmdlet parameters, and the DNS paths used to locate directory services, including exceptions?
• What baseline for Active Directory replication, Windows DNS, domain-controller location, time, network reachability, privileges, and protected credentials must accompany the source-specific observation?
• Which success, stop, and escalation criteria are written before testing begins?

DSE recommendation:

DSE recommends using the cited source as the evidence anchor for this decision. Start with applicability, then compare the observed state with the cited source. Record the source location, examined part of Active Directory objects, search bases, domain controllers, delegated roles, cmdlet parameters, and the DNS paths used to locate directory services, observed and expected states, owner, and reason for deviation.

If the review warrants change, use a bounded implementation with prerequisites, test population, monitoring, abort criteria, and a rehearsed reversal. Sequence checks for Active Directory replication, Windows DNS, domain-controller location, time, network reachability, privileges, and protected credentials and sanitize protected material before retention.

Verification and evidence

A reviewer should be able to retrace the decision from Introduction below H1; Introduction below H1 through sanitized command transcripts, parameter records, directory exports, authorization records, DNS locator tests, and before-and-after state. Record what was collected, where, when, by whom, and which system or role it represents.

Label this evidence set DSE-20260827-401 so observations, approvals, exceptions, and later rechecks cannot be substituted from another source review.

Record the decision even when no change is made, including uncertainty and the next trigger. Use safe testing conditions for disruptive work, preserve rollback proof, and revisit the conclusion after relevant platform, dependency, vendor, or ownership changes.

Official references

• How to disable TLS 1.3 for AD and LDAP — Microsoft