Sometimes you get the error
Out of resources when opening file './database/table.MYD' (Errcode: 24 - Too many open files)
To fix this on Ubuntu 16.04 you have to change the limits and to change the systemd-config:
With current browsers and java you cannot use remote console because of mismatching ssl-protocols.
1) Download JNLP-File
Login in your ELO with edge or IE and download the jnlp for remote console:
"Remote Control" > "Redirection"