PocketCloud for Android keeps asking for VNC password

Dear all,

I got a free edition of PocketCloud for Android (consider to upgrade Pro soon). I am happy with RDC connection so far, but got a problem with VNC Connection

Client: HTC Desire S, running latest Wyse PocketCloud (from Android Market). Android v. 2.3.3 (Gingerbread)
Host Machine: Windows XP Pro SP3
VNC Server: RealVNC Enterprise Edition v.4.6.1

I have set the password on VNC Server as VNC Password. However, every time I attempt to connect to it from my HTC, pocketcloud says my password is wrong? I even tried to remove the VNC password (mean no password required), pocketcloud still keeps asking for it???

Any idea?
Best