http2 with nginx not working with Safari

Hello guys,

My https site cannot be displayed in Safari with “nsposixerrordomain:100” error. I’m running nginx 1.13.3 and Ubuntu 17.04. The site is displayed fine in other browsers and the SSL test also completes fine (A+). When I disable the http2 from server block, it displays fine in Safari.

Thanks for any useful info.


server {
listen 443 ssl http2 default_server;
listen [::]:443 ssl http2 default_server;
root /var/www/;
index index.php index.html index.htm;
location / {
#try_files $uri $uri/ =404;
try_files $uri $uri/ /index.php$is_args$args;
ssl_certificate /etc/letsencrypt/live/; # managed by Certbot
ssl_certificate_key /etc/letsencrypt/live/; # managed by Certbot
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_ecdh_curve secp384r1;
ssl_stapling on;
ssl_stapling_verify on;
ssl_dhparam  /etc/nginx/ssl/dhparam.pem;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 180m;
ssl_session_tickets off;
add_header Strict-Transport-Security "max-age=31536000;
add_header X-Frame-Options DENY;
add_header X-Content-Type-Options nosniff;
http2_max_field_size 16k;
http2_max_header_size 32k;
http2_recv_buffer_size 32k;
#includeSubDomains" always;
location ~ \.php$ {
include snippets/fastcgi-php.conf;
fastcgi_pass unix:/run/php/php7.0-fpm.sock;
location ~ /\.ht {
deny all;
server {
listen         80;
listen    [::]:80;
return         301 https://$server_name$request_uri;

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Accepted Answer

Apparently Safari doesn’t like multiple line HTTP headers under HTTP/2.

If above config has been copy and pasted right, the your HSTS header looks wrong since it opens quotes but doesn’t close it until multiple lines later. Fix that and it should work.

Hi, Thanks for the suggestion. It worked! Many thanks again, Michael

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