Hi In all tutorial and in the manual, the ispcpconfig installer are downloaded throw an insecure connection. For security reason development team should provide some linux repo if you won't to be on the standard repo of debian/ubuntu. For example Domain Technologie Control are in the debian repo Thanks, Regards
You can get ispconfig securely by using the download link that we provide trough sourceforge. there you find also the md5sum so you can verify that the sourcecode you downloaded is the correct one. https://sourceforge.net/projects/ispconfig/files/latest/download
As in Linux you don't use https+md5 to authenticate packages, the best is to have package in the main repo OR have a separate repo OR to have a signature for that package.
We might provide a repo in future. But this requires a lot of additional work for each release as we support several Linux distributions, so we will have to provide repos and packages for debian, Ubuntu, Centos, OpenSuSE and Fedora.
