我使用Python Twisted（17.5.0）构建了一个TLS服务器，在python 3.5.3上运行，代码如下（缩短了）：
from OpenSSL import crypto
from twisted.internet.ssl import (PrivateCertificate,KeyPair,Certificate)
from twisted.internet import reactor
from twisted.internet import protocol, task, defer
pkey_obj = open("server.key","rb").read()
pkey = crypto.load_privatekey(crypto.FILETYPE_PEM, pkey_obj)
regsrv_obj = open("servercert.pem","rb").read()
regsrv_cert = crypto.load_certificate(crypto.FILETYPE_PEM, regsrv_obj)
certificate = Certificate(regsrv_cert)
prkey = KeyPair(pkey)
prkey_and_cert = PrivateCertificate.fromCertificateAndKeyPair(certificate, prkey)
tls_server_options = prkey_and_cert.options()
factory = protocol.Factory.forProtocol(Echo)
reactor.listenSSL(5444, factory, tls_server_options)
return defer.Deferred()
我从http://twistedmatrix.com/documents/current/core/howto/ssl.html
改编了它服务器使用以下命令正确启动并可用：
python3 tls_server.py
如果现在想要使用 openssl s_client 查询此服务器，则服务器输出以下错误：
[失败实例：回溯:: [（'SSL例程'，'tls_post_process_client_hello'，'无共享密码'）]
问题：为什么服务器和客户端无法就通用密码达成一致？
服务器密钥是基于secp521r1的EC密钥，如果我通过 openssl s_server 打开服务器密钥/证书的TLS服务器，它可以正常工作。我扭曲的实现一定有问题。
编辑： 我尝试使用
枚举服务器端的可用密码nmap --script ssl-enum-ciphers -p 5444 localhost
但似乎服务器不提供任何密码或SSL功能。如果我在底层伪协议的die connectionLost（）方法中输出错误，这就是我在服务器端得到的错误：
2017-08-15 15:35:40+0200 [-] connection lost: [Failure instance: Traceback: <class 'OpenSSL.SSL.Error'>: [('SSL routines', 'tls_post_process_client_hello', 'no shared cipher')]
2017-08-15 15:35:40+0200 [-] /usr/local/lib/python3.5/dist-packages/twisted/internet/posixbase.py:597:_doReadOrWrite
2017-08-15 15:35:40+0200 [-] /usr/local/lib/python3.5/dist-packages/twisted/internet/tcp.py:208:doRead
2017-08-15 15:35:40+0200 [-] /usr/local/lib/python3.5/dist-packages/twisted/internet/tcp.py:214:_dataReceived
2017-08-15 15:35:40+0200 [-] /usr/local/lib/python3.5/dist-packages/twisted/protocols/tls.py:315:dataReceived
2017-08-15 15:35:40+0200 [-] --- <exception caught here> ---
2017-08-15 15:35:40+0200 [-] /usr/local/lib/python3.5/dist-packages/twisted/protocols/tls.py:235:_checkHandshakeStatus
2017-08-15 15:35:40+0200 [-] /usr/local/lib/python3.5/dist-packages/OpenSSL/SSL.py:1716:do_handshake
2017-08-15 15:35:40+0200 [-] /usr/local/lib/python3.5/dist-packages/OpenSSL/SSL.py:1456:_raise_ssl_error
2017-08-15 15:35:40+0200 [-] /usr/local/lib/python3.5/dist-packages/OpenSSL/_util.py:54:exception_from_error_queue
2017-08-15 15:35:40+0200 [-] ]