这两天被这个 frp 转发问题搞的头大了。
手头有两台云服务器，一台腾讯云，一台阿里云，阿里云使用 frps，frpc 连接后没有任何问题，https 页面可以正常打开。
但是腾讯云同样的 frps 和客户端的 frpc 配置，只能访问 http 端口，不能访问 https 端口，后台也可以看到 frpc 访问的日志，但是就是不能打开 https 页面。
- frps 日志
[https] join connections, workConn(l[172.27.0.16:7000] r[x.x.x.x:40688]) userConn(l[172.27.0.16:443] r[x.x.x.x:51612]) 但是我发现腾讯云本机可以正常访问 https 服务，外部就是不行，端口已经全部打开了。
- 本机访问 fprs 日志
[proxy.go:221] [78a21caf9e2b36d8] [https] join connections, workConn(l[172.27.0.16:7000] r[x.x.x.x:39712]) userConn(l[172.27.0.16:443] r[x.x.x.x:52728]) - 腾讯云本机访问 curl -vv
* Rebuilt URL to: https://x.x.x/ * Trying x.x.x.x... * TCP_NODELAY set * Connected to x.x.x (x.x.x.x) port 443 (#0) * ALPN, offering h2 * ALPN, offering http/1.1 * successfully set certificate verify locations: * CAfile: /etc/ssl/certs/ca-certificates.crt CApath: /etc/ssl/certs * TLSv1.2 (OUT), TLS handshake, Client hello (1): * TLSv1.2 (IN), TLS handshake, Server hello (2): * TLSv1.2 (IN), TLS handshake, Certificate (11): * TLSv1.2 (IN), TLS handshake, Server key exchange (12): * TLSv1.2 (IN), TLS handshake, Server finished (14): * TLSv1.2 (OUT), TLS handshake, Client key exchange (16): * TLSv1.2 (OUT), TLS change cipher, Client hello (1): * TLSv1.2 (OUT), TLS handshake, Finished (20): * TLSv1.2 (IN), TLS handshake, Finished (20): * SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384 * ALPN, server accepted to use h2 * Server certificate: * subject: CN=x.x * start date: Jun 5 21:49:41 2019 GMT * expire date: Sep 3 21:49:41 2019 GMT * subjectAltName: host "x.x.x" matched cert's "*.x.x" * issuer: C=US; O=Let's Encrypt; CN=Let's Encrypt Authority X3 * SSL certificate verify ok. * Using HTTP2, server supports multi-use * Connection state changed (HTTP/2 confirmed) * Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0 * Using Stream ID: 1 (easy handle 0x5559f69468e0) > GET / HTTP/2 > Host: x.x.x > User-Agent: curl/7.58.0 > Accept: */* - 外部访问 curl -vv
* Rebuilt URL to: https://x.x.x/ * Trying x.x.x.x... * TCP_NODELAY set * Connected to x.x.x (x.x.x.x) port 443 (#0) * ALPN, offering h2 * ALPN, offering http/1.1 * successfully set certificate verify locations: * CAfile: /etc/ssl/certs/ca-certificates.crt CApath: /etc/ssl/certs * (304) (OUT), TLS handshake, Client hello (1): * OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to x.x.x:443 * stopped the pause stream! * Closing connection 0 curl: (35) OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to x.x.x:443 - frpc.ini
[common] server_addr = x.x.x.x server_port = 7000 token = xxxxxxx [https] type = https local_port = 666 ; custom_domains = x.x.x - frps.ini
[common] bind_port = 7000 vhost_https_port = 443 vhost_http_port = 80 token = xxxxxxx log_file = /var/log/frp/frps.log log_level = debug log_max_days = 3 
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