Error Code 0x21

Definition of TGT/TGS Issue Error Codes codes.

0x21 KRB_AP_ERR_TKT_NYV The ticket is not yet valid. The ticket presented to the server is not yet valid (in relationship to the server time). The most probable cause is that the clocks on the KDC and the client are not synchronized. If cross-realm Kerberos authentication is being attempted then you should verify time synchronization between the KDC in the target realm and the KDC in the client realm as well.

This code may be used in the following events / insertation strings: