Support for CPI-C Automatic Logon

This topic describes the support for automatic logon for CPI-C applications that is available in Microsoft® SNA Server version 3.0 with Service Pack 1 or higher. This feature requires specific configuration by the network administrator: For more information on configuring this feature, see the SNA Server online documentation.

The CPI-C application must be invoked on the LAN side from a client of SNA Server. The client must be logged into a Microsoft® Windows NT® domain, but can be any platform that supports SNA Server's CPI-C APIs.

The client application is coded to use "program" level security, with a special hard-coded CPI-C user name MS$SAME and password MS$SAME. When this session allocation flows from client to SNA Server, the SNA Server looks up the host account and password corresponding to the Windows NT account under which the client is logged in, and substitutes the host account information into the APPC attach message it sends to the host.

In CPI-C, this is done in three separate function calls:

• Call the Set_Conversation_Security_Type function with the conversation_security_type parameter set to CM_SECURITY_PROGRAM.
• Call the Set_Conversation_Security_User_ID function with the security_user_ID parameter set to the MS$SAME string and the security_user_ID_length parameter set to 7.
• Call the Set_Conversation_Security_Password function with the security_password parameter set to the MS$SAME string and the security_password_length parameter set to 7.