Sorry, forgot to attach the patch in my previous email. The attached patch fixes Trac #2005 (getnameinfo error on mac with ipv6 addresses). The problem was caused by a failure to initialize the field sockaddr_in6.sin6_len . The initialization was only happening on NetBSD; apparently OS X needs it too. This patch sets that field if the macro SIN6_LEN is defined (which is the standard way to detect that, according to my research online and RFC 3493 (http://tools.ietf.org/html/rfc3493). -Judah Sat Jul 19 10:18:41 PDT 2008 Judah Jacobson <judah.jacobson@gmail.com> * FIX #2005: Set the sockaddr_in.sin6_len field on all platforms that support it, not just NetBSD. M ./Network/Socket.hsc -1 +1