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Home : Support : Troubleshooting
 
 
TROUBLESHOOTING CONNECTION PROBLEMS

Symptom Possible Cause Suggested Resolution
Can't connect to server, error message: "Cannot resolve <hostname>" The hostname you typed cannot be mapped to an IP address (DNS error)
  • Make sure that you did not mistype the hostname.
  • Make sure that the DNS servers are set correctly in your network configuration.
  • Use a numeric IP address instead of a hostname.
Can't connect to server, error message: "Unable to connect to <hostname>:<port>" The target host does not exist or can not be reached

You can try to "ping" the target host to see if it can be reached:

  1. Activate your network connection
  2. Menu Server / Network prefs
  3. Menu Options / View log
  4. Enter "ping <hostname> <CR>" where <hostname> is the target host name, and <CR> is a carriage return (stylus stroke from top right to bottom left
There is no VNC server running on the target host
  • Make sure a VNC server is installed and running on the target host.
  • Make sure you use the correct display number (normally 0 for a WinVNC serv
The target host is behind a firewall that blocks traffic on the specified port.
This could be the case if you're trying to connect through an internet connection over GPRS, or if you have a personal firewall running on the server (such as Windows XP's built-in firewall)
  • Configure the firewall so that it allows incoming traffic on port 5900/TCP to the target host.
  • If you don't have control over the firewall settings, see below.

Try to use a different port number than the default (5900). Usually port 80 is a good choice (if you are not already running a web server on the this port) because it's normally used for HTTP, and so it will most probably not be blocked by your network operator.

  1. On the PalmVNC client, in the advanced connection properties, change the port number to "80".
  2. On the WinVNC server, you need to use regedit to manually edit or add some values under HKEY_CURRENT_USER\Software\ORL\WinVNC3:
    "AutoPort" (DWORD) with value 0
    "PortNumber" (DWORD) with value 80 (decimal)
Error message: "Loopback connections are disabled" You are connecting through a proxy that makes it appear as though the connection was originating from the server computer itself.

Enable loopback (local) connections on the VNC server. You need to use regedit to manually add the following value under HKEY_LOCAL_MACHINE\SOFTWARE\ORL\WinVNC3:
"AllowLoopback" (DWORD) with value 1.

Alternately, you may dowload and open this file; when asked if you wish to merge the contents of this file with the registry, say yes.

 

TROUBLESHOOTING USAGE PROBLEMS

Symptom Possible Cause Suggested Resolution
When I try to set the scale to anything but 1:1, I get a "Connection Lost!" message The server you are using does not support server-side scaling.

You need to upgrade your server to one that includes server-side scaling, such as the Ultr@VNC server included in the binary distribution of Palm VNC 2.0.
Some clients support client-side scaling. The fact that these clients may work with your server does not indicate that the server has scaling extensions.

The screen looks garbled (using a scale other than 1:1) The most likely explanation is that your desktop is set to 256 colours. The scaling extensions assume that the desktop is in 15-bit colour or higher. Set your desktop to a higher colour depth to correct this problem.
PalmVNC is slow The network bandwitdh (connection speed) is too low Use a faster connection. If you're using a GSM data connection, consider switching to GPRS.
The image being transmitted is too complex

Reduce the complexity of the display. The following hints will help to achieve this (in approximate order of effectiveness):

  • Use a solid colour for your backdrop. Images or patterns on your desktop slow down PalmVNC dramatically.
  • Keep unused windows minimised. This will reduce the amount of "background clutter" that has to be transmitted when scrolling.
  • Turn off "Smooth edges of screen fonts". Font smoothing has no beneficial effect when viewing your desktop through PalmVNC. In addition, font smoothing will reduce the readability of the screen when using the scaling extensions.
  • Set your titlebars to a single colour (Windows 98/2000 only).
  • Turn off "Show icons using all possible colors".
  • Turn off all effect for menus and lists
I need to pan around too much Desktop resolution is too high The best settings to use for the desktop is 800x600 and 32-bit colour. This will give you a reasonable panning area and optimal server-side scaling performance.


 
 


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