I have developed an application for OSX 10.11 as GUI to the rsync command-line tool. There are two versions of the application, one is released by MacUdate the other by Apple App Store. Rsync command-line might be used through ssh and passwordless logins(by private/public key pair). The MacUpdate version of my application is working as expected. But the Apple App Store installed version does not. Both applications is used from the same user. The Apple App Store installed version complains about "..Host key verification fail..". Both applications uses same code, the only difference is how they are installed. The application is using rsync to do the actual transfer of files... http://rsyncosx.blogspot.no/ My knowledge of ssh is limited and I dont know where to search for a solution? Anyone?