When you run into security issues attempting to remote into the system via IPMI.
https://learningintheopen.org/2017/11/03/java-jnlp-error-weak-signature-algorithm-md5withrsa/
Step-by-step guide
- Control Panel → Java
- Security Tab → Edit Site List...
- Enter the BMC address and press 'continue'
- Remote console should work fine now
...