Authenticating a credential in a dispersed storage network

A computing device of a dispersed storage network (DSN) comprises:

• memory;
• an interface;
• and
• a processing module operably coupled to the memory and the interface, wherein the processing module is operable to:
• receive, via the interface and from a requesting device of the DSN, an access request, wherein at least one of the access request and the requesting device is associated with a credential;
• determine whether an authentication of the credential is included in a local authentication list, wherein the local authentication list is stored in a cache of the computing device, and wherein, during a first timeframe, the authentication is operative to authenticate the credential;
• and
• when the authentication of the credential is included in the local authentication list:
• determine whether the first timeframe has expired based on a timestamp associated with the authentication, the first timeframe, and a current timestamp;
• and
• when the first timeframe has expired:
• determine whether a condition exists to extend a time for the authentication to be operative during a second timeframe;
• and
• when the condition exists:
• determine whether the second time frame has expired based on the timestamp associated with the authentication, the second timeframe, and a second current timestamp;
• and
• when the second time frame has not expired, utilize the authentication included in the local authentication list to authenticate the access request.