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I also specify a display when I start the server (for example, vncserver :1 1024x768) and when I connect I use IP:display, not the port (for example vncviewer 192.168.0.5:1).
That shouldn't cause a password error though, it would stop the connection if it were incorrect. Have you had a look in ~/.vnc/passwd to see if there is an obfuscated password string plus your username?