我有一個使用 ipv4 和 ipv6 啟動並運行的 Ubuntu 18.04 伺服器。可透過 ipv4 和 ipv6 存取 (ssh) 系統。有一個 NGINX 已啟動並正在運行，並帶有有效且已付費的憑證。
使用 ipv6 的客戶端使用該設定完全沒有問題。另一方面，使用 ipv4 的客戶端有 SSL 問題，無法建立任何連線。
在職的
curl -ipv6 --verbose --trace-time -I https://clients.fanciety.com
01:18:14.653230 * Rebuilt URL to: https://clients.fanciety.com/
01:18:14.684108 * Trying 2a01:4f8:231:d4b::2...
01:18:14.684156 * TCP_NODELAY set
01:18:14.702125 * Connected to clients.fanciety.com (2a01:4f8:231:d4b::2) port 443 (#0)
01:18:14.702296 * ALPN, offering h2
01:18:14.702333 * ALPN, offering http/1.1
01:18:14.702415 * Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
01:18:14.708653 * successfully set certificate verify locations:
01:18:14.708698 * CAfile: /etc/ssl/cert.pem
CApath: none
01:18:14.708792 * TLSv1.2 (OUT), TLS handshake, Client hello (1):
01:18:14.728231 * TLSv1.2 (IN), TLS handshake, Server hello (2):
01:18:14.728529 * TLSv1.2 (IN), TLS handshake, Certificate (11):
01:18:14.754838 * TLSv1.2 (IN), TLS handshake, Server key exchange (12):
01:18:14.755787 * TLSv1.2 (IN), TLS handshake, Server finished (14):
01:18:14.759776 * TLSv1.2 (OUT), TLS handshake, Client key exchange (16):
01:18:14.759809 * TLSv1.2 (OUT), TLS change cipher, Client hello (1):
01:18:14.759898 * TLSv1.2 (OUT), TLS handshake, Finished (20):
01:18:14.776641 * TLSv1.2 (IN), TLS change cipher, Client hello (1):
01:18:14.776778 * TLSv1.2 (IN), TLS handshake, Finished (20):
01:18:14.776813 * SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384
01:18:14.776850 * ALPN, server accepted to use http/1.1
01:18:14.776881 * Server certificate:
01:18:14.776917 * subject: CN=clients.fanciety.com
01:18:14.776950 * start date: Aug 24 00:00:00 2018 GMT
01:18:14.776976 * expire date: Aug 23 12:00:00 2020 GMT
01:18:14.777025 * subjectAltName: host "clients.fanciety.com" matched cert's "clients.fanciety.com"
01:18:14.777059 * issuer: C=US; O=DigiCert Inc; OU=www.digicert.com; CN=Thawte TLS RSA CA G1
01:18:14.777084 * SSL certificate verify ok.
01:18:14.777146 > HEAD / HTTP/1.1
01:18:14.777146 > Host: clients.fanciety.com
01:18:14.777146 > User-Agent: curl/7.54.0
01:18:14.777146 > Accept: */*
01:18:14.777146 >
01:18:14.798724 < HTTP/1.1 200 OK
HTTP/1.1 200 OK
01:18:14.798820 < Server: nginx/1.14.0 (Ubuntu)
Server: nginx/1.14.0 (Ubuntu)
01:18:14.798852 < Date: Fri, 31 Aug 2018 23:18:14 GMT
Date: Fri, 31 Aug 2018 23:18:14 GMT
01:18:14.798883 < Content-Type: text/html; charset=UTF-8
Content-Type: text/html; charset=UTF-8
01:18:14.798914 < Content-Length: 7
Content-Length: 7
01:18:14.798945 < Connection: keep-alive
Connection: keep-alive
01:18:14.798976 < X-Powered-By: Express
X-Powered-By: Express
01:18:14.799010 < Accept-Ranges: bytes
Accept-Ranges: bytes
01:18:14.799042 < Cache-Control: public, max-age=0
Cache-Control: public, max-age=0
01:18:14.799087 < Last-Modified: Fri, 31 Aug 2018 19:55:04 GMT
Last-Modified: Fri, 31 Aug 2018 19:55:04 GMT
01:18:14.799123 < ETag: W/"7-165918da924"
ETag: W/"7-165918da924"
01:18:14.799164 < Vary: Accept-Encoding
Vary: Accept-Encoding
01:18:14.799205 <
01:18:14.799266 * Connection #0 to host clients.fanciety.com left intact
不工作
curl -ipv4 --verbose --trace-time -I https://clients.fanciety.com
01:33:21.196560 * Rebuilt URL to: https://clients.fanciety.com/
01:33:21.202064 * Trying 159.69.61.244...
01:33:21.202128 * TCP_NODELAY set
01:33:21.239275 * Connected to clients.fanciety.com (159.69.61.244) port 443 (#0)
01:33:21.239447 * ALPN, offering h2
01:33:21.239481 * ALPN, offering http/1.1
01:33:21.239561 * Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
01:33:21.243809 * successfully set certificate verify locations:
01:33:21.243842 * CAfile: /etc/ssl/cert.pem
CApath: none
01:33:21.243919 * TLSv1.2 (OUT), TLS handshake, Client hello (1):
01:33:21.275023 * error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
01:33:21.275129 * stopped the pause stream!
01:33:21.275224 * Closing connection 0
curl: (35) error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
不工作
curl -ipv4 -3 --verbose --trace-time -I https://clients.fanciety.com
01:31:38.919241 * Rebuilt URL to: https://clients.fanciety.com/
01:31:38.924589 * Trying 159.69.61.244...
01:31:38.924632 * TCP_NODELAY set
01:31:38.961890 * Connected to clients.fanciety.com (159.69.61.244) port 443 (#0)
01:31:38.962064 * ALPN, offering h2
01:31:38.962102 * ALPN, offering http/1.1
01:31:38.962183 * Cipher selection: ALL:!EXPORT:!EXPORT40:!EXPORT56:!aNULL:!LOW:!RC4:@STRENGTH
01:31:38.966495 * successfully set certificate verify locations:
01:31:38.966530 * CAfile: /etc/ssl/cert.pem
CApath: none
01:31:38.966638 * SSLv3 (OUT), TLS handshake, Client hello (1):
01:31:38.997553 * SSLv3 (OUT), TLS alert, Server hello (2):
01:31:38.997718 * error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number
01:31:38.997801 * stopped the pause stream!
01:31:38.997879 * Closing connection 0
curl: (35) error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number
透過 ipv4 或 ipv6 使用 openssl 是否有任何協定差異？
openssl s_client -connect clients.fanciety.com:443 -state -debug
...
SSL_connect:SSLv2/v3 write client hello A
read from 0x11942e0 [0x11998c0] (7 bytes => 7 (0x7))
0000 - 48 54 54 50 2f 31 2e HTTP/1.
SSL_connect:error in SSLv2/v3 read server hello A
140130130867864:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:s23_clnt.c:794:
...
NGINX SSL 配置
listen [::]:443 ssl;
listen 443 ssl;
ssl on;
ssl_certificate /etc/nginx/ssl/cert.pem;
ssl_certificate_key /etc/nginx/ssl/key.pem;
ssl_dhparam /etc/nginx/ssl/dhparam.pem;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers ECDH+AESGCM:ECDH+AES256:ECDH+AES128:DHE+AES128:!ADH:!AECDH:!MD5;
ssl_session_cache shared:SSL:20m;
ssl_session_timeout 120m;
ssl_prefer_server_ciphers on;
NGINX日誌
2018/09/01 00:45:06 [error] 1381#1381: *35 connect() failed (111: Connection refused) while connecting to upstream, client: 2003:e1:9717:1500:5858:af84:640e:bf02, server: clients.fanciety.com, request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:9999/", host: "clients.fanciety.com:443"
2018/09/01 01:35:30 [crit] 3794#3794: *26 SSL_do_handshake() failed (SSL: error:1417D18C:SSL routines:tls_process_client_hello:version too low) while SSL handshaking, client: 2600:c02:1020:4202::ac10:8269, server: [::]:443
wget 似乎使用 ipv4 和連接埠 443 接收內容，沒有 ssl - 伺服器根本不提供沒有 ssl 的 http。
答案1
我很確定這不是您展示的完整配置。或者，中間存在一些配置錯誤的中間件（如負載平衡器）。雖然您的伺服器無法理解IPv4 連接埠443 上的HTTPS，但它實際上會在通常的HTTPS 連接埠443 上回應IPv4 上的HTTP。實際上會響應連接埠IPv6 上的 80。
換句話說：您的配置有些混亂，但這不在您顯示的部分。
# HTTP (port 80) on IPv6 works, redirects to HTTPS (port 443)
$ curl -ipv6 -v http://clients.fanciety.com/
...
HTTP/1.1 301 Moved Permanently
# HTTPS (port 443) on IPv6 works
$ curl -ipv6 -v https://clients.fanciety.com/
...
HTTP/1.1 200 OK
# HTTP (port 80) on IPv4 results in connection refused
$ curl -ipv4 -v http://clients.fanciety.com/
...
curl: (7) Failed to connect to clients.fanciety.com port 80: Connection refused
# HTTPS (port 443) on IPv4 results in TLS error
$ curl -ipv4 -v https://clients.fanciety.com/
...
curl: (35) error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol
# but HTTP on to the default HTTPS port (443) works
$ curl -ipv4 -v http://clients.fanciety.com:443/
...
HTTP/1.1 200 OK