Java Security Setting Preventing VNC Remote Console from Starting

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For customers with Dynamic Cloud Server

So you can use the VNC Remote Console with Java Version 7 Update 51 or newer.

If you are using Java 7 with build 1.7.0_51 or newer on your PC, it is necessary that you specify the 1&1 IONOS VNC server and the 1&1 IONOS as a trusted source. You do this in the security settings of your Java Runtime.

Step 1

Start the Java Control Panel.

Step 2

Under the Security tab you will find the Edit Site List option.

step 3

Add the entries https://mein.ionos.de and https://xvp.onlinehome-server.info to the list.

Step 4

If you are using Java 8, you must add the following lines to the java.policy file:

permission java.net.SocketPermission "217.72.206.68:993", "connect,resolve";
permission java.net.SocketPermission "217.72.206.68:5901-5920", "connect,resolve";
permission java.net.SocketPermission "217.72.206.68:6201-6220", "connect,resolve"; 

File Path to java.policy:

Windows
C:\Programs (x86)\Java\jre8\lib\security\java.policy
Linux
/usr/lib/jvm/java-8-oracle/jre/lib/security/java.policy
MACOS
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/lib
Step 5

Now start the VNC Remote Console from 1&1 IONOS and confirm that you want to execute the application by choosing Execute. The console should now open normally again.