The constructor SNIHostName(byte[] encoded) should check if the encoded hostname conform to RFC 3490.

@@ -173,7 +173,8 @@ public final class SNIHostName extends SNIServerName {
                     .onUnmappableCharacter(CodingErrorAction.REPORT);
 
             this.hostname = IDN.toASCII(
- decoder.decode(ByteBuffer.wrap(encoded)).toString());
+ decoder.decode(ByteBuffer.wrap(encoded)).toString(), IDN.USE_STD3_ASCII_RULES);