Http failure reponse only with Iphone/IOS/Safari (nginx 1.8)

[Rejaine Monteiro]

I have an nginx working as a reverse proxy for several servers in the
backend, after updated from 1.7 to 1.8 , everything is working fine, except
for a webservice that is giving error only when accessed by
IPhone/IOS/Safari..
That is, for Android, Windows, Chrome or Mozilla, it works normally.
But if you open it through Safari from an IOS, from the Http error...

Http failure reply for https://etc...
  Unknown error.

SSL certificates were also installed for the new server. Nginx settings
were all kept as per the old server.

And nothing has changed in the webservice application either. The only
change was in the proxy server infrastructure, which was migrated to a
newer server, with a new operating system and a new version of nginx.

We have already checked the firewall, routes, etc., everything is normal,
because it is connecting normally on all other platforms, the error is only
occurring even with IOS/Iphone.

Any tips?

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