>        We had been getting this message ...
>       ANR8220W TCP/IP driver is unable to set the window size to
>      655360 for client xxx.yyy.ww.zz.  The default value will
>      be used.
>        And as one response was to check the window start up and another to
>     check the dsm.sys file, that was were we looked. The windowsize
>     setting has been reduced from the max 640 setting to 150 (which was
>     the first setting when the above message stopped coming out).
>        So we stopped and restart the schedules on the new nodes and its
>     working now. Magic or what?

Not magic - just relative values...
        The tcpwindow size defined under TCP/IP under the operating system for
        the client is set smaller than the ADSM client option defined
        tcpwindow size.  In AIX, use the 'no -a' command to see the tcpwindow
        size.