"C:\Program Files\UltraVNC\vncviewer.exe" -dsmplugin msrc4plugin.dsm -listen 5500
I was using the MSRC4Plugin.dsm version 1.21 (7/10/2006) which didn't seem to want to work with my DynDNS host name and only worked if I hard coded the IP address into the helpdesk.txt file.
So I went to http://msrc4plugin.home.comcast.net/msrc4plugin.html and downloaded version 1.22 - (8/16/2006) of the plugin (MSRC4Plugin122.zip).
I extracted the plugin and renamed it from MSRC4Plugin_NoReg.dsm to MSRC4Plugin.dsm and copied it to my C:\Program Files\UltraVNC directory. I deleted any other plugins that were in my \UltraVNC directory
(actually I did save a copy of the old plugins in the \UltraVNC\plugins directory just in case I needed to revert to old version for some reason).
I've read that renaming the plugin is not necessary, but I personally couldn't get it to work without renaming it.
I generated a new rc4.key file with the 1.22 version of the plugin. I renamed the key from new_rc4.key to rc4.key and put a copy in my C:\Program Files\UltraVNC directory (made sure to delete any old keys first). I then recreated my custom SC using a copy of the new key and a copy of the version 1.22 plugin.
I launched the viewer with the following options:
"C:\Program Files\UltraVNC\vncviewer.exe" -dsmplugin MSRC4Plugin.dsm -listen 5500
Low and behold THIS WORKED. I was able to use my dyndns host name and encryption and everything worked as advertised!
The HOST line in my helpdesk.txt file looks like this:
-plugin -connect MyHostName.dyndns.org:5500 -noregistry
where MyHostName is obviously substituted with the actual name of my host.
I think it is easy to get the combination of plugins and keys mixed up when trying to get this to work and testing all the different combinations.
You really need to delete all plugins and keys then copy the new version of the plugin to your UltraVNC directory and then generate a new key. This will prevent using the wrong plugin/key combination. It might be tedious but using patience and a careful methodology helped me to get it working.
Hope this may help someone!
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