i'm a long term ispconfig user (since version 2). I recently deceided to switch my server from Debian8 to a recent version. I chose to do a new install and use the migration Tool (already purchased) to transfer Data. I've installed a fresh Debian10 as a Proxmox LXC on a Hetzner Server. Following the Perfect Server Setup twice, i ran into the same error at the point where Letsencrypt (acme.sh)gets involved: Do you want a secure (SSL) connection to the ISPConfig web interface (y,n) [y]: Checking / creating certificate for isp.zerosub.de Using certificate path /etc/letsencrypt/live/isp.zerosub.de Using apache for certificate validation Issuing certificate seems to have succeeded but /usr/local/ispconfig/interface/ssl/ispserver.crt seems to be missing. Falling back to self-signed. Generating RSA private key, 4096 bit long modulus (2 primes) The hostname is configured properly (etc/hosts and /etc/hostname), the IP is pointing to the right machine and the DNS records are set. I can not find the problem. Even when i go further, letsenrypt is not able to issue any certificate(through the Webinterface). To me there seems to be a problem with the acme.sh Doing ispconfig_update.sh --force results in the same error. Could there be something wrong with the acme.sh implementation in the recent setup?