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The Web Auth protocol allows a WAS to securely identify a user accessing resources.

This component of the Web KDC is referred to as the Web Login service.

When the Web KDC receives one of these, it will first see if the request includes a cookie that contains cached credentials.

From the perspective of the WAS, they are opaque blobs that are sent back to the Web KDCThe webkdc-proxy-token contains a user's proxied credentials (generally, but not necessarily, a Kerberos ticket-granting ticket).

It can only be decrypted by the Web KDC, and the Web KDC will only allow a webkdc-proxy token to be used by the server it was originally generated for.

It also supports single sign-on, allowing a user to access multiple Web Auth-protected applications without having to authenticate to each one separately (unless an application requires this for security reasons).

The WAS can also choose to either trust the Web KDC to vouch for the identity of a user, or it can request the Web KDC use an authenticator such as a Kerberos service request (KRB_AP_REQ) that it can verify using its own Kerberos keys.

: the contents of this page have not been updated since 2014 and may contain inaccurate information about Stanford’s authentication and authorization systems.

For information about the future direction of Stanford Authentication, start at uit.stanford.edu/webauth-announce.

If the request contains a valid cookie, this cookie is used to obtain new credentials and the user is redirected back to the WAS (unless the WAS has requested the user reauthenticate).