# Nginx SPDY: Missing NPN Extension in SSL/TLS Handshake? **URL:** \ **Category:** NGINX\ **Created:** [June 9, 2013, 7:10am UTC](https://www.ruby-forum.com/t/nginx-spdy-missing-npn-extension-in-ssl-tls-handshake/235245 "2013-06-09T07:10:48Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![alcina](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/a587f6/32.png) [@alcina](https://www.ruby-forum.com/u/alcina)\ **Post date:** [June 9, 2013, 7:10am UTC](https://www.ruby-forum.com/t/nginx-spdy-missing-npn-extension-in-ssl-tls-handshake/235245/1 "2013-06-09T07:10:48Z")
Hi guys, I’ve tried setting up CentOS 6.4, Nginx 1.4.1 with Google SPDY support and used [spdycheck.org](http://spdycheck.org) to check the site and all SPDY checks pass except this notice: Missing NPN Extension in SSL/TLS Handshake Sorry, but this server is not including an NPN Entension during the SSL/TLS handshake. The NPN Extension is an additional part of the SSL/TLS ServerHello message which allows web servers to tell browsers they support additional protocols, like SPDY. SSL/TLS servers that don’t use send the NPN Extension cannot use SPDY because they have no way to tell the browser to use SPDY instead of HTTP. What exactly am I missing from Nginx 1.4.1, openssl 1.0.1e and SPDY setup to properly satisfy NPN Extension in SSL/TLS handshake ? Chrome reports SPDY support fine though. cheers Posted at Nginx Forum: > **[Nginx SPDY: Missing NPN Extension in SSL/TLS Handshake ?](https://forum.nginx.org/read.php?2,239971,239971#msg-239971)** > > Hi guys, I've tried setting up CentOS 6.4, Nginx 1.4.1 with Google SPDY support and used spdycheck.org to check the site and all SPDY checks pass except this notice: Missing NPN Extension in SSL/TLS Handshake Sorry, but this server is not including... ---
**Author:** ![George](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/71e660/32.png) [@George](https://www.ruby-forum.com/u/George)\ **Post date:** [June 9, 2013, 1:53pm UTC](https://www.ruby-forum.com/t/nginx-spdy-missing-npn-extension-in-ssl-tls-handshake/235245/2 "2013-06-09T13:53:50Z")
Hi, this doesn’t really make sense; NPN is absolutely required for SPDY. What does the ssllabs test say in “Next Protocol Negotiation”? > **[SSL Server Test (Powered by Qualys SSL Labs)](https://www.ssllabs.com/ssltest/index.html)** > > A comprehensive free SSL test for your public web servers. Regards, Lukas ---
**Author:** ![George](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/71e660/32.png) [@George](https://www.ruby-forum.com/u/George)\ **Post date:** [June 9, 2013, 2:49pm UTC](https://www.ruby-forum.com/t/nginx-spdy-missing-npn-extension-in-ssl-tls-handshake/235245/3 "2013-06-09T14:49:21Z")
According to ssllabs for NPN Next Protocol Negotiation Yes spdy/2 http/1.1 so [spdycheck.org](http://spdycheck.org) incorrect ? Posted at Nginx Forum: > **[Re: RE: Nginx SPDY: Missing NPN Extension in SSL/TLS Handshake ?](https://forum.nginx.org/read.php?2,239971,239977#msg-239977)** > > Hi guys, I've tried setting up CentOS 6.4, Nginx 1.4.1 with Google SPDY support and used spdycheck.org to check the site and all SPDY checks pass except this notice: Missing NPN Extension in SSL/TLS Handshake Sorry, but this server is not including... ---
**Author:** ![George](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/71e660/32.png) [@George](https://www.ruby-forum.com/u/George)\ **Post date:** [June 9, 2013, 3:40pm UTC](https://www.ruby-forum.com/t/nginx-spdy-missing-npn-extension-in-ssl-tls-handshake/235245/4 "2013-06-09T15:40:11Z")
> so [spdycheck.org](http://spdycheck.org) incorrect ? I guess so. I would suggest to report this to support at zoompf dot com so they can fix it (or tell what exactly is wrong). Regards, Lukas ---
**Author:** ![George](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/71e660/32.png) [@George](https://www.ruby-forum.com/u/George)\ **Post date:** [June 10, 2013, 2:42pm UTC](https://www.ruby-forum.com/t/nginx-spdy-missing-npn-extension-in-ssl-tls-handshake/235245/5 "2013-06-10T14:42:18Z")
Thanks Lukas for your help 🙂 Posted at Nginx Forum: > **[Re: RE: Nginx SPDY: Missing NPN Extension in SSL/TLS Handshake ?](https://forum.nginx.org/read.php?2,239971,240007#msg-240007)** > > Hi guys, I've tried setting up CentOS 6.4, Nginx 1.4.1 with Google SPDY support and used spdycheck.org to check the site and all SPDY checks pass except this notice: Missing NPN Extension in SSL/TLS Handshake Sorry, but this server is not including...