Java Web Start / JWS on Windows 10/11

With Java 17 gaining more acceptance, one thing it doesn’t support anymore are older Java web apps used on networking switches and KVM devices. You’ll need to work around it, to gain access to those systems. This other post I found was helpful, though it’s for a Linux context.

1. Install OpenWebStart & tell it to associate with your JNLP files.
2. Open up %USERPROFILE%\.cache\icedtea-web\jvm-cache\adoptium_11.0.13_x64\conf\security\java.security (check the version #) with Visual Studio Code, Notepad, or other text editor.
3. Find & modify the following code segment…

   # See "jdk.certpath.disabledAlgorithms" for syntax descriptions.
   # jdk.jar.disabledAlgorithms=MD2, MD5, RSA keySize < 1024, \
   #     DSA keySize < 1024, include jdk.disabled.namedCurves
   
   jdk.jar.disabledAlgorithms=MD2, RSA keySize < 1024
   

4. You might have to do the same for the jre/lib/security/java.security file where you installed OpenWebStart.
5. Try opening the JNLP file.