I cannot get webRDP working

I tried using webRDP, which is a Java-based (so multi-platform) RDP client that can work as a standalone program (single .jar file) or embedded on a web page.

When I try connecting using it by double clicking the .jar file, I get The server has reset the connection, on both Windows Server 2008 R2 and Windows 7. I tried all sorts of credential combinations with domain names (long and short ways) and without.

When I tried using it from a webpage, I got the following error in the Java Console:

Java Plug-in 1.6.0_26
Using JRE version 1.6.0_26-b03 Java HotSpot(TM) Client VM

load: class com.webinflection.webrdp.MainApplet not found.
java.lang.ClassNotFoundException: com.webinflection.webrdp.MainApplet
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Exception: java.lang.ClassNotFoundException: com.webinflection.webrdp.MainApplet

What is causing these problems?

This is the unmodified html page that I am using. I thought I'd try getting it working before I go through the proper configuration:

<html>
<head>
<title>webRDP&#0153;</title>
<meta http-equiv='content-type' content='text/html; charset=iso-8859-1'>
<meta http-equiv='content-style-type' content='text/css'>
<meta http-equiv='expires' content='Wed, 26 Feb 1997 08:21:57 GMT'>
<meta http-equiv='pragma' content='no-cache'>
<!-- Sets margin around applet -->
<style>
body.swproxyBody { margin:4px;; }
</style>
<script type='text/javascript'>
// This method is called after the user logs out of their RDP session. The method name is
a configurable applet parameter.
function rdpOnLogout() {
alert ( ' User has Logged out ' );
}
</script>
</head>
<body class='swproxyBody'>
<!-- Loads the applet and utilizes 100% of browser window width and height. Width and
height could be hard coded to specific values -->
<applet name='rdp' code='com.webinflection.webrdp.MainApplet' archive='webRDP.jar'
width='100%' height='100%'>
<!-- Hostname or IP Address of Terminal Server -->
<!-- This is a required parameter -->
<param name='host' value='10.1.1.25'>
<!-- Port that the Terminal Server -->
<!-- This is a required parameter. -->
<param name='port' value='3389'>
<!-- Username to authenticate to Terminal Server with -->
<!-- Optional SSO Parameter -->
<param name='username' value='joe'>
<!-- Password to authenticate to Terminal Server with -->
<!-- Optional SSO Parameter. If left blank, the Terminal Server will prompt the
user to supply their password.-->
<param name='password' value='cat1dog2'>
<!-- AD Domain name to authenticate to Terminal Server with -->
<!-- Optional SSO Parameter. In some Terminal Server deployments, this
parameter will be required. -->
<param name='domain' value=''>
<!-- Application to start. This value should be url encoded. In this example we are
launching c:\windows\system32\notepad.exe-->
<param name='program' value='c%3A%5Cwindows%5Csystem32%5Cnotepad.
exe'>
<!-- Working directory for Application. This value should be url encoded. In this
example the working directory will be set to c:\windows\system32\ -->
<param name='directory' value='c%3A%5Cwindows%5Csystem32%5C'>
<!-- In this example I used a site ( http://meyerweb.com/eric/tools/dencoder/ ) to
encode the above values -->
<!-- This specifies a javascript method to be called after the user logs out of the
RDP session. This stops the session from hanging is a disconnected state. -->
<param name='onlogout' value='rdpOnLogout'>
</applet>
</body>
</html>

paradroid

Posted 2011-09-15T10:34:31.750

Reputation: 20 970

Thanks, but I still have problem 2. The md5 checksums are the same, so I am sure that the file is no corrupt. I am using the html webpage from the Configuration Guide, with no modifications (until I get it working). Do you think it could be a file ownership issue? – paradroid – 2011-09-17T13:16:56.103

Possibly, are you doing this all locally from a folder on your machine, or are you actually publishing it to a web server and trying to use it from there? the likelihood of it being a permissions / ownership problem is greater in the latter example. – peelman – 2011-09-18T04:24:48.033

It's being hosted on a Linux server (Debian) running Apache. All the files are owned by the Apache user (www-data). Doesn't it seem like this is the problem in the example html webpage?: <applet name='rdp' code='com.webinflection.webrdp.MainApplet' archive='webRDP.jar' width='100%' height='100%'> – paradroid – 2011-09-18T05:01:10.103

what happens if you try to hit the applet directly from the web browser? and/or change the relative path of the applet to be a fully formed URL? – peelman – 2011-09-18T05:32:45.927

When I use the full path of the applet the browser tries to download it. Using the full URL in the archive= field gave the same error. I am using HTTPS, if that makes any difference. I've added the html webpage to my question. Thanks. – paradroid – 2011-09-18T10:47:40.717

That all looks right to me. I'm out of ideas. If you figure it out, I'd appreciate a post-back about what the problem was. Good luck. – peelman – 2011-09-19T01:54:02.210

Stupid of me not to check before, but in the Apache logs I have this error: File does not exist: /var/www/mydomain.co.uk/rdp/com. So it is looking for a file called com for some reason. I cannot see anything in the html file which seems relevant to this error. – paradroid – 2011-09-19T20:25:31.980

The only difference between your HTML and our functional demo site is we use double quotes and you're using single quotes. Shouldn't be a deal breaker, but i'm not sure. What browser are you using? – peelman – 2011-09-20T00:33:48.317

I have tried using Chrome, Firefox and IE9. I replaced all single quotes with double quotes but still get the error. It's still looking for this 'com' file. – paradroid – 2011-09-20T02:33:51.507

Can you PM me the URL so i can look at it directly? – peelman – 2011-09-20T14:35:04.830

Sure, but how? I cannot see any contact details on your blog. – paradroid – 2011-09-21T14:34:17.467

peelman[at]gmail[dot]com – peelman – 2011-09-21T16:05:00.147

I cannot get webRDP working

Answers