An employee cannot sign in to the domain

Fictional learning model, not a Windows lab. A new computer cannot find a domain controller while joining lab.example. No domain credentials are cached.

Gather evidence

Inspected: 0/4

Client configuration

DNS check

Connectivity

Events and context

Conclusion and actions

Which explanation is best supported?
The password was stolen because 4625 is absentClient DNS cannot resolve internal SRV recordsThe DC is definitely offline
What is the safe next step?
Disable the firewall across the networkReset the password without checkingConfigure approved internal DNS; repeat SRV, DC Locator and domain join checks
What allows the ticket to be closed?
One ping succeededSRV and DC Locator succeed; domain join and an approved test account's sign-in are confirmedThe message disappeared without a new attempt

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