Mono.Security [00 24 00 00 04 80 00 00 94 00 00 00 06 02 00 00 00 24 00 00 52 53 41 31 00 04 00 00 01 00 01 00 79 15 99 77 D2 D0 3A 8E 6B EA 7A 2E 74 E8 D1 AF CC 93 E8 85 19 74 95 2B B4 80 A1 2C 91 34 47 4D 04 06 24 47 C3 7E 0E 68 C0 80 53 6F CF 3C 3F BE 2F F9 C9 79 CE 99 84 75 E5 06 E8 CE 82 DD 5B 0F 35 0D C1 0E 93 BF 2E EE CF 87 4B 24 77 0C 50 81 DB EA 74 47 FD DA FA 27 7B 22 DE 47 D6 FF EA 44 96 74 A4 F9 FC CF 84 D1 50 69 08 93 80 28 4D BD D3 5F 46 CD FF 12 A1 BD 78 E4 EF 00 65 D0 16 DF] 1.0.5000.0 2.0.0.0 Gtk# is thread aware, but not thread safe; See the Gtk# Thread Programming for details. System.Delegate To be added. To be added. Type of the method that can find the private key associated with a specific X.509 certificate and a host name. To be added. First we assign a method to select a private key. // ... initialize the NetworkStream, get the X.509 certificate ... using (SslServerStream s = new SslServerStream (ns, certificate, false, false)) { s.PrivateKeyCertSelectionDelegate += new PrivateKeySelectionCallback (GetPrivateKey); } The method has the certificate and the name of the target host to find the appropriate private key. private static AsymmetricAlgorithm GetPrivateKey (X509Certificate certificate, string targetHost) { PrivateKey key = PrivateKey.CreateFromFile (targetHost + ".pvk"); return key.RSA; } System.Security.Cryptography.AsymmetricAlgorithm