Hi, s_server fails to load ECDH params. It might work with some compilers/platforms. The fix is in s_server.c : 1000 (1.0.1m) Original code: #ifndef OPENSSL_NO_ECDH int no_ecdhe; #endif Fix #ifndef OPENSSL_NO_ECDH int no_ecdhe = 0; #endif Thanks, Yuval.