There is an OpenBSD 5.3 server. It only listens on port 443 with an apache (on higher port an sshd listens, but port knocking is used).How can I hide the servers operating system/webserver to be recognized as something else thatn OpenBSD. ex.: some Linux distribution, etc.
How to hide an OpenBSD 5.3 server as it would be a windows server or something else?
security
If you want to get a server to look like something else, you should have an awareness of passive OS fingerprinting.  Michal Zalewski's p0f v3 could be used to unmask your server based on TCP handshake's initial SYN packet, or on TCP connection take down.When acting as a NAT router, OpenBSD can scrub routed packets to make OS identification harder, but it's not clear to me if OpenBSD can mark up its own TCP packets to avoid such passive identification.