I was greeted with a server which doesn't answer on port 80 (looks like https is the default, redirect would be a better choice I think) and a server which doesn't reply on port 443 either:
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$ curl -vkI https://ec2-52-57-41-128.eu-central-1.compute.amazonaws.com/
* Trying 52.57.41.128...
* Connected to ec2-52-57-41-128.eu-central-1.compute.amazonaws.com (52.57.41.128) port 443 (#0)
* found 173 certificates in /etc/ssl/certs/ca-certificates.crt
* found 697 certificates in /etc/ssl/certs
* ALPN, offering http/1.1
* SSL connection using TLS1.2 / ECDHE_RSA_AES_128_GCM_SHA256
* server certificate verification SKIPPED
* server certificate status verification SKIPPED
* common name: ip-172-31-4-202.eu-central-1.compute.internal (does not match 'ec2-52-57-41-128.eu-central-1.compute.amazonaws.com')
* server certificate expiration date OK
* server certificate activation date OK
* certificate public key: RSA
* certificate version: #3
* subject: OU=Zimbra Collaboration Server,CN=ip-172-31-4-202.eu-central-1.compute.internal
* start date: Wed, 30 Aug 2017 16:20:00 GMT
* expire date: Mon, 29 Aug 2022 16:20:00 GMT
* issuer: O=CA,OU=Zimbra Collaboration Server,CN=ip-172-31-4-202.eu-central-1.compute.internal
* compression: NULL
* ALPN, server accepted to use http/1.1
> HEAD / HTTP/1.1
> Host: ec2-52-57-41-128.eu-central-1.compute.amazonaws.com
> User-Agent: curl/7.47.0
> Accept: */*
>
* Empty reply from server
* Connection #0 to host ec2-52-57-41-128.eu-central-1.compute.amazonaws.com left intact
curl: (52) Empty reply from server
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2017/08/30 16:23:55 [notice] 1830#0: Using 32KiB of shared memory for upstream_fair
2017/08/30 16:23:55 [notice] 1830#0: using the "epoll" event method
2017/08/30 16:23:55 [notice] 1830#0: nginx/1.7.1
2017/08/30 16:23:55 [notice] 1830#0: OS: Linux 4.4.0-1022-aws
2017/08/30 16:23:55 [notice] 1830#0: getrlimit(RLIMIT_NOFILE): 524288:524288
2017/08/30 16:23:55 [notice] 1831#0: start worker processes
2017/08/30 16:23:55 [notice] 1831#0: start worker process 1832
2017/08/30 16:23:55 [notice] 1831#0: start worker process 1833
2017/08/30 16:23:55 [notice] 1831#0: start worker process 1834
2017/08/30 16:23:55 [notice] 1831#0: start worker process 1835
2017/08/30 16:23:55 [info] 1835#0: memcache: 1/1 connections initialized
2017/08/30 16:23:55 [info] 1834#0: memcache: 1/1 connections initialized
2017/08/30 16:23:55 [info] 1833#0: memcache: 1/1 connections initialized
2017/08/30 16:23:55 [info] 1832#0: memcache: 1/1 connections initialized
2017/08/30 16:27:02 [info] 1835#0: *5 SSL_read() failed (SSL: error:14094418:SSL routines:ssl3_read_bytes:tlsv1 alert unknown ca:SSL alert number 48) while waiting for request, client: 213.209.99.168, server: 0.0.0.0:443
2017/08/30 16:28:21 [info] 1832#0: *46 client closed connection while waiting for request, client: 213.209.99.168, server: 0.0.0.0:443
2017/08/30 16:28:28 [info] 1832#0: *48 client closed connection while waiting for request, client: 213.209.99.168, server: 0.0.0.0:443
2017/08/30 16:28:33 [info] 1832#0: *50 client closed connection while waiting for request, client: 213.209.99.168, server: 0.0.0.0:443
2017/08/30 16:29:03 [info] 1832#0: *52 client closed connection while waiting for request, client: 213.209.99.168, server: 0.0.0.0:443
2017/08/30 16:30:03 [info] 1832#0: *54 client closed connection while waiting for request, client: 213.209.99.168, server: 0.0.0.0:443
I'm about to leave, will have a look tomorrow.