An attempt to fix some SSH connection failures by changing the order of key exchange methods. This change still fixes the previous problem reported in ticket #1090.

Author: simsekgokhan

src/third-party/libssh2/sources/src/kex.c

@@ -1708,11 +1708,10 @@ kex_method_diffie_helman_group_exchange_sha256 = {
 };
 
 static const LIBSSH2_KEX_METHOD *libssh2_kex_methods[] = {
-    //&kex_method_diffie_helman_group_exchange_sha256,  // #1090: Patch for libssh2 for ssh connection issue due to Ubuntu 16.04/OSX's 
-                                                        // OpenSSH 6.9 version have disabled obsolete form of KEX "Diffie-Hellman group exchange" algorithm .
-    &kex_method_diffie_helman_group_exchange_sha1,
     &kex_method_diffie_helman_group14_sha1,
     &kex_method_diffie_helman_group1_sha1,
+    &kex_method_diffie_helman_group_exchange_sha1,
+    &kex_method_diffie_helman_group_exchange_sha256,
     NULL
 };