访问Nginx发生SSL connection error的一种情况

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server {
listen       80;
listen       443;
server_name  a.xxx.com;

ssl on;
ssl_certificate /path/server.crt;
ssl_certificate_key /path/server.key;
...
}
server {
listen       80;
listen       443;
server_name  b.xxx.com;
#以下没有ssl相关的配置
...
}

访问 https://a.xxx.com会发生什么情况呢？

$curl https://a.xxx.com
curl: (35) SSL connect error

$openssl s_client -connect a.xxx.com:443

CONNECTED(00000003)
139997789181768:error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol:s23_clnt.c:699:
---
no peer certificate available
---
No client certificate CA names sent
---
SSL handshake has read 7 bytes and written 112 bytes
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
---