Hi Damien, Thanks for reporting this issue! The problem was upstream (cf. https://github.com/OpenVPN/easy-rsa/issues/261 ), and should be fixed with the next release of easy-rsa. If you're in a hurry, you can just remove the RANDFILE variable (check the github issue), or download the update directly from mentors: https://mentors.debian.net/package/easy-rsa
Cheers, -- Michele.