Internal Server Error 500

[RanojitKumar]

No response from subprocess (/usr/local/cpanel/whostmgr/docroot/cgi/letsencrypt/letsencrypt.pl):
cpsrvd Server at hostname.mysite.com

How could I resolve this issue?

[mepjnik]

Hi,

This fixed my issue:

Login WHM > Tweak Setting > Security > Allow deprecated WHM accesshash authentication > Enable ( On )