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Microsoft KB Archive/251313

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Knowledge Base

Article ID: 251313

Article Last Modified on 2/21/2007


  • Microsoft Host Integration Server 2000 Standard Edition
  • Microsoft SNA Server 4.0
  • Microsoft SNA Server 4.0 Service Pack 1
  • Microsoft SNA Server 4.0 Service Pack 2
  • Microsoft SNA Server 4.0 Service Pack 3

This article was previously published under Q251313


This article provides step-by-step instructions for configuring SNA Server for PU Passthrough connections. An SNA node can access a host through the connections available on a computer running SNA Server using the PU Passthrough Service. This service causes SNA Server to work like an IBM 3174 cluster controller, allowing display, printer, and LU6.2 sessions from the downstream device. The downstream node does not have to be an SNA Server. PU Passthrough is useful when a downstream device cannot connect directly to the mainframe or AS/400 computer.


Configuring SNA Server for PU Passthrough Connections

  1. On the SNA Server computer, configure two connections. The connection to the host can be any supported host connection type, including SDLC and channel adapters. The downstream connection must be an Ethernet or Token Ring connection. For this example, "connection A" will refer to the host connection and "connection B" will refer to the downstream connection.
  2. Specify the MACADDR of the host as the Remote Network Address on connection A, and then specify the MACADDR of the downstream device as the Remote Network Address on connection B.
  3. Select PU Passthrough as the remote end for both connections. The allowed direction and activation fields cannot be changed.
  4. In the properties of one connection, select the other connection for Passthrough via Connection. This will notify SNA Server that data arriving on one connection should be passed to the other connection.
  5. Before you configure the downstream SNA node, you may want to change the Remote End of connection A (connection to the host) to Host System, and then verify that the connection will activate successfully. Before you configure the downstream node, change the connection back to PU Passthrough.
  6. On the downstream SNA device, the connection type is either Token Ring or Ethernet. The Remote Network Address for this connection should be the address of the SNA Server handling the PU Passthrough. You can obtain this address by typing ipconfig /all at a command prompt on the SNA Server computer. All LUs should be configured on the downstream node. This includes LU6.2 sessions, display, and printer sessions. Refer to the SNA Server online documentation for additional information about configuring display, printer, and LU6.2 sessions.

Note: If the host connection is to an AS/400 computer, you need to delete any existing controller descriptions for the SNA Server computer handling PU Passthrough. If the AS/400 Autocreate feature is enabled, a new controller description should be created on the AS/400 computer when the downstream device connects to the AS/400 computer for the first time. This new controller will have the name of the downstream device and the MACADDR of the SNA Server.

Troubleshooting hint: Because the SNA Server computer may have other host DLC connections defined, you may need to adjust the Service Access Point (SAP) addresses before this will work properly. This is required when two or more connections communicate with the same host destination. For additional information about SAPs, click the article number below to view the article in the Microsoft Knowledge Base:

107192 Multiple Connections to the Same Host Over 802.2


For more information about the SNA Server PU Passthrough feature, please refer to the online documentation.

Additional query words: HIS 2000

Keywords: KB251313