The server refuses a request to start a session because an invalid authentication protocol was requested during sign-on processing. This might be due to a down-level client, server, or storage agent that is accessing a server or storage agent that is configured to disallow such attempts.
Server operation continues.
Upgrade the accessing client, server, or storage agent to version 6.3 or later, or re-configure the server to allow access from down-level clients, servers, or storage agents.