The Doorman is a "port-knocking" listener daemon which
helps users secure private servers. It allows a Linux or Unix server to run invisibly, with all TCP ports closed.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.
