Hi,

try

1) curl -ivvv https://<upstream ip_address> to your upstreams.
2) add server <ip_addr>:443 (if your upstreams accepting ssl connections on 443)



br,
Aziz.





> On 20 Nov 2017, at 20:46, shivramg94 <nginx-forum@forum.nginx.org> wrote:
>
> I am trying to use nginx as a reverse proxy with upstream SSL. For this, I
> am using the below directive in the nginx configuration file
>
> proxy_pass https://<upstream_block_file_name>;
>
> where "<upstream_block_file_name>" is another file which has the list of
> upstream servers.
>
> upstream <upstream_block_file_name> {
> server <IP_address_of_upstream_server>:<Port> weight=1;
> keepalive 100;
> }
>
> With this configuration if I try to reload the Nginx configuration, it fails
> intermittently with the below error message
>
> nginx: [emerg] host not found in upstream \"<upstream_block_file_name>\"
>
> However, if I changed the protocol mentioned in the proxy_pass directive
> from https to http, then the reload goes through.
>
> Could anyone please explain what mistake I might be doing here?
>
> Thanks in advance.
>
> Posted at Nginx Forum: https://forum.nginx.org/read.php?2,277415,277415#msg-277415
>
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