|Message:||The login packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library.%.*ls|
The SQL Server computer was unable to process the client login packet. This may be because the packet was created improperly or because the packet was damaged during transmission. It can also be caused by the configuration of the SQL Server computer. The IP address listed is the address of the client computer.
When using Windows Authentication in a Kerberos environment, a client receives a Kerberos ticket that contains a Privilege Attribute Certificate (PAC). The PAC contains various types of authorization data including groups that the user is a member of, rights the user has, and what policies apply to the user. When the client receives the Kerberos ticket, the information contained in the PAC is used to generate the user’s access token. The client presents the token to the SQL Server computer as part of the login packet.
If the token was improperly created or damaged during transmission, SQL Server cannot offer additional information about the problem.
When the user is a member of many groups or has many policies, the token may grow larger than normal to list them all. If the token grows larger than the
To resolve this problem, increase the
Incorrectly editing the registry can severely damage your system. Before making changes to the registry, we recommend that you back up any valued data on the computer.
To change the MaxTokenSize on the server computer