Hello OpenSSH Developers, Tru64 V5.1, and probably previous versions, assumes you want 4.3BSD socket behaviour unless 4.4BSD sockets are explicitly requested, which can be done by #defining one of "_SOCKADDR_LEN" or "_XOPEN_SOURCE_EXTENDED". Probably #defining "_SOCKADDR_LEN" has less consequences. 4.3BSD socket behaviour means that getaddrinfo returns sockaddr structs where sa_family is set to zero, which causes subsequent calls to getnameinfo to barf. Any chance you can take this into consideration in "configure"? thanks, Rob Urban