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WININET_E_SEC_CERT_DATE_INVALID
WININET_E_SEC_CERT_DATE_INVALID means that the server certificate failed its validity-date check. In the documented WinINet error set this is commonly an expired certificate, but the local clock and a certificate not yet valid can lead to the same class of validation failure.
What to verify
- The certificate validity period and complete chain presented by the server.
- The client system time, time zone, and synchronization state.
- Whether a TLS-inspecting proxy presents a different certificate from the origin server.
Do not disable the check globally
Ignoring certificate-date validation removes an authentication safeguard. Correct the clock, certificate deployment, or proxy trust configuration instead; use a narrowly controlled test exception only when diagnosing the cause.
Microsoft: InternetErrorDlg certificate handling · Microsoft: WinINet error messages
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