Hello! Excuse me for so nooby question. But I've installed apache2 and it returns file list in every folder. How can I disable it in whole server and for new sites by default?
ISPConfig is not setting that option, the system defaults f the Linux distribution get applied there. Check the gloval apache config file, you should find there a Options line with "Indexes", try to change that to "-Indexes" or remove Indexes from that line.