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SAP Gui SNC single sign-on after Windows network ID change

All our users use SAP Gui single signon via the sncgss32.dll (i.e. NT LAN Manager, not Kerberos). This normally passes through their network login from their Windows PC and matches it with the SNC name in their user master record in order to log them in with the correct SAP userid. We have a user who has changed their network login, but the SAP Gui still seems to be passing through their old login. I'm wondering if it may be cached somewhere in their PC file-system ? When they access a system they haven't accessed before the new (correct) login is passed through OK.

Thanks for any help you can offer on this.

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