IIS 10 - Chrome 44 ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY

Question

After upgrading to Windows 10, I am receiving the ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY in Google Chrome (Firefox 39 just doesn't load the page) when I attempt to access my machine over HTTPS. I have a GoDaddy signed certificate for my computer.

I've attempted disabling most of my encryption ciphers per https://http2.github.io/http2-spec/#BadCipherSuites.

I've gone so far that I've disabled ciphers that are keeping me from RDPing to my desktop...and it still gives me an error!

Any guidance is appreciated.

Answer 1

Apparently you are not the only one having this issue: Disabling HTTP/2 / SPDY in HTTP.SYS and IIS in Windows 10

According to the error message this is a SPDY issue, so the certificate and the cipher suites are not the cause.

SPDY is a protocol allowing multiplexing HTTPS requests but it will be replaced by HTTP/2. As a temporary fix, you can apparently disable its support in you browser/registry/server.

Answer 2

I ran into this same issue after my win 10 dev machine got updated twice recently (the updates took around 35-40 minutes to deploy each time) and after this i was not able to run my Visual studio 2015 web applications over Https on Chrome but was able to run on IE

• I tried out the registry method for disabling Http 2 as mentioned here, but this did not worked for me
• Then I came across the following solution: I downloaded IIS Crypto and selected "Cipher Suites" option and clicked Best Practices button, and applied it, My problem was gone and i can now run my web app over Https in Chrome just like before