I am having trouble upgrading nginx from 1.17 to 1.18 (or .19, .20) Everything works ok on 1.17, but higher versions give this error:
2021/08/27 01:14:45 [error] 22#22: *8 peer closed connection in SSL handshake (104: Connection reset by peer) while SSL handshaking to upstream, client: 192.168.**.**, server: api*******.hm.*******.gov.br, request: "GET /favicon.ico HTTP/1.1", upstream: "https://192.168.**.**:443/favicon.ico", host: "api*******.hm.********.gov.br"
The error only happens when upstream is a internal IIS server. When upstream is another nginx it works with versions above 1.17
config is basically:
location / {
proxy_pass https://$host.***.br$uri$is_args$args;
I tried to use proxy_ssl_verify off without success.
IIS certificate is self-generated.
Please advise