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# Session Error 2574 in 3270 Applet

Article ID: 118498

Article Last Modified on 12/5/2003

APPLIES TO

- Microsoft SNA Server 2.0, when used with:
  - Microsoft Windows NT 4.0
- Microsoft SNA Server 2.1, when used with:
  - Microsoft Windows NT 4.0
- Microsoft SNA Server 3.0, when used with:
  - Microsoft Windows NT 4.0
- Microsoft SNA Server 2.11 Service Pack 1, when used with:
  - Microsoft Windows NT 4.0
- Microsoft SNA Server 3.0 Service Pack 4, when used with:
  - Microsoft Windows NT 4.0

This article was previously published under Q118498

## SYMPTOMS

The SNA Server applet generates a Session Error 2574 when you attempt to establish a connection with an SNA Server.

## CAUSE

This error may occur if the 3270 applet is trying to connect to an LU Pool that is defined on the SNA Server and that LU Pool doesn't have any LUs assigned to it. If you start SNA Server Admin and put the focus on the LU Pools windows, a "No Assigned LUs" message may be in the right side of the window.

## RESOLUTION

To correct this error, add LUs to the LU Pool that the 3270 Applet is trying to establish a connection to. Also, changing an LU Pool definition requires that all affected SNA Servers be restarted to pick up the configuration change. In SNA Server Admin, all affected servers will appear as "Active [Out of Date]" to indicate that the server needs to be restarted for the configuration change to take effect.

Additional query words: prodsna

Keywords: kbprb KB118498