Question

我有以下问题：

长生不老药

[centos@ip-172-172-3-49 helix]$ env MIX_ENV=prod mix release
Could not find Hex, which is needed to build dependency :plug_cowboy
Shall I install Hex? (if running non-interactively, use "mix local.hex --force") [Yn] Y

18:12:32.462 [info]  ['TLS', 32, 'client', 58, 32, 73, 110, 32, 115, 116, 97, 116, 101, 32, 'hello', 32, 'received SERVER ALERT: Fatal - Handshake Failure', 10]
** (Mix) httpc request failed with: {:failed_connect, [{:to_address, {'repo.hex.pm', 443}}, {:inet6, [:inet6], :enetunreach}, {:inet, [:inet], {:tls_alert, 'handshake failure'}}]}

Could not install Hex because Mix could not download metadata at https://repo.hex.pm/installs/hex-1.x.csv.

我想根本原因是Erlang造成的

Erlang/OTP 21 [erts-10.2.1] [source] [64-bit] [smp:36:36] [ds:36:36:10] [async-threads:1] [hipe]
1> ssl:start().
ok
2> Sock = fun() -> {ok, S} = gen_tcp:connect("google.com", 443, []), S end.
#Fun<erl_eval.20.128620087>
3>  ssl:connect(Sock(), []).
=INFO REPORT==== 28-Dec-2018::18:10:30.019612 ===
TLS client: In state hello received SERVER ALERT: Fatal - Handshake Failure
{error,{tls_alert,"handshake failure"}}

是否有解决方法？ Os是Centos 7。

Update1

在MacOS上，它可以正常工作：

Erlang/OTP 21 [erts-10.2] [source] [64-bit] [smp:6:6] [ds:6:6:10] [async-threads:1] [hipe] [dtrace]

Eshell V10.2  (abort with ^G)
1> ssl:start().
ok
2>  Sock = fun() -> {ok, S} = gen_tcp:connect("google.com", 443, []), S end.
#Fun<erl_eval.20.128620087>
3>  ssl:connect(Sock(), []).
{ok,{sslsocket,{gen_tcp,#Port<0.6>,tls_connection,undefined},
               [<0.100.0>,<0.99.0>]}}
4>

Answer 1

事实证明，我使用的Erlang RPM不正确地支持Erlang中的新SSL。

https://github.com/rabbitmq/erlang-rpm/releases/download/v21.2.1/erlang-21.2.1-1.el7.centos.x86_64.rpm

使用与Erlang Solutions不同的版本可以正常工作：

https://packages.erlang-solutions.com/erlang/esl-erlang/FLAVOUR_1_general/esl-erlang_21.2-1~centos~7_amd64.rpm

Answer 2

ssl：connect / 2的描述如下：http://erlang.org/doc/man/ssl.html#connect-2。

连接就像：

@echo on
reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Autodesk Revit 2018 SP9" /V DisplayVersion  >C:\INSTALLS\RV.csv

if %DisplayVersion%=="18.3.1.2" goto wait
pause

如何使TLS与Erlang 21一起使用？

2 个答案: