Hallo Procher,
ich denke das hilft:
If you are using Client Access Express V5R1 or later you must synchronize your AS400 password and Windows password. To enable a disabled user for Microsoft Networks:
Go in to Operations Navigator
Left click on
Networks
Servers
TCP/IP

Right click on AS400 Netserver and disabled users will be displayed and can be enabled from here.

Gruss TARASIK