id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
1267	TLS 1.0 handshake fails on upstream when TLS1.2 is enabled	abarre@…		"Proxification to server accepting TLSv1 fails when TLSv1.2 is activated

We discover this problem when proxifying to www.groupama.fr which is a website that support only TLSv1 but don't support TLSv1.1 or TLSv1.2
(see https://www.ssllabs.com/ssltest/analyze.html?d=www.groupama.fr)

We had to change our nginx configuration in order to establish TLS connection to this server on TLSv1: 

location / {
-  proxy_ssl_protocols TLSv1 TLSv1.1 TLSv1.2; (fails)
+ proxy_ssl_protocols TLSv1 TLSv1.1; (work)
...

The Error message when TLSv1.2 is enabled : peer closed connection in SSL handshake while SSL handshaking to upstream

We don't understand why nginx don't try to establish a connection to TLSv1 when TLSv1 TLSv1.1 and TLSv1.2 are activated."	defect	closed	minor		nginx-module	1.11.x	invalid	TLS proxy	tech@…	Linux worker01-integration 3.13.0-101-generic #148-Ubuntu SMP Thu Oct 20 22:08:32 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux	"nginx version: nginx/1.11.8
built with OpenSSL 1.0.2k  26 Jan 2017
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fPIE -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security -fPIC -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -fPIE -pie -Wl,-z,relro -Wl,-z,now -fPIC' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/nginx.pid --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-http_slice_module --with-threads --with-openssl=/openssl-1.0.2k --with-http_stub_status_module --with-http_gunzip_module --with-http_v2_module --with-threads --with-file-aio --add-module=/tmp/ngx_http_enhanced_memcached_module --add-module=/tmp/headers-more-nginx-module --add-module=/tmp/lua-nginx-module --add-module=/tmp/ngx_devel_kit --add-module=/tmp/lua-upstream-nginx-module"