CentOS 4.8 VNC server issue - bug??

When I tried to connect to a remote desktop pc (installed with CentOS 4.8) using vncviewer command, I get this error:

Quote:

VNC viewer for X version 4.0 - built Feb 11 2009 13:36:48 Copyright (C) 2002-2004 RealVNC Ltd. See http://www.realvnc.com for information on VNC. Fri Apr 10 16:26:51 2020 CConn: connected to host MY_HOSTNAME_HERE port 5900 CConnection: Server supports RFB protocol version 3.7 CConnection: Using RFB protocol version 3.7 main: read: Connection reset by peer (104)

This is only happening when I tried to connect to a PC with CentOS 4.8.
Is this a bug of CentOS 4.8? What alternative remote desktop software can I try?

I tried NoMachine software, but I always got an error:

Quote:

<No available sessions on this server>

and when i click that error, it expans as:

Quote:

The server was unable to make local display available or access to the local display is disabled.

Please advise what to do. Thanks!