The BARR/CHANNEL link service trace updates the system registry. Before you run the trace for the first time, follow these steps to set up the SNA gateway trace registry from the SNA Manager.
Open Microsoft SNA Manager.
SNA Server – From the taskbar, click Start | Programs | Microsoft SNA Server | Manager.
HIS – From the taskbar, click Start | Programs | Host Integration Server | Manager.
Open the trace settings.
SNA Server – On the menu bar, select Tools | Trace.
HIS – On the menu bar, select Tools | Trace Initiator.
On the Trace Items tab, click BARRC1 (Bus & Tag) or BARRE1 (ESCON). (You might see a different number after the C or E if you installed more than one BARR/CHANNEL link service.)
Click OK.