Why does an EAP-TLS resumed session generate error 691?

Extensible Authentication Protocol-Transport Layer Security (EAP-TLS) is a Point-to-Point Protocol (PPP) extension supporting additional authentication methods within PPP. Transport Layer Security (TLS) provides for mutual authentication, integrity-protected cipher suite negotiation, and key exchange between two endpoints.

When you try to reconnect an EAP-TLS connection, the session sometimes stops working and returns error 691 Access was denied because the user name and/or password was invalid on the domain. To work around the problem, wait at least 2 minutes before you try to reconnect. Note: If you’re using smart cards for remote access authentication in Windows 2000, you must use the EAP-TLS authentication method.

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