Chrome error: 'ERR_SPDY_PROTOCOL_ERROR

v3
#28

There are many ways to fix this error, You can any one and can fix very easily, Mostly it can fix by

  1. Updating Google Chrome Browser
  2. Flush the Socket Solution
  3. Clear Cookies
  4. Restart Browser If still problem not solve then try manually for more fixes.
#29

Perhaps try to change your current SSL Cipher with these:

https://mozilla.github.io/server-side-tls/ssl-config-generator/

#30

I had one of my sites suddenly go down with a SPDY_PROTOCOL_ERROR, all my other sites were operational so I knew 100% it was nothing to do with any certificate problem.

I eventually traced it to a permissions problem with the location for the nginx fastcgi cache. A simple chown -R www-data:www-data on the /var/cache/nginx folder resolved it for me immediately. Hopefully this may help someone in future.

#31

Hi, Mahendra meghwal Your suggestion really working for me. I find that mostly it is happen due to cookies and also Antivirus. I found also a good site where you can find right fixes. Thanks

#32

This is also happen due to Anti Virus, If you are using Avast Safe sure it will due to this. You can try it via disable.

#33

I am facing this error many times. i jusy found some simple solution to resloved this error here. few normal steps write about here

#34

100% working try this fix

#35

HTTP/2 has a huge blacklist of old and insecure ciphers, so we must avoid them. Try the following configuration, it works for me (EasyEngine v3.8.1 / Ubuntu 18.04 LTS)

ssl_ciphers EECDH+CHACHA20:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5;

Working reference: https://www.digitalocean.com/community/tutorials/how-to-set-up-nginx-with-http-2-support-on-ubuntu-16-04

#37

Thank You

#38

Worked perfectly. Thanks!

#39

this worked for me!

#40

I see everyone posting fixes on how to resolve this issue but why hasn’t the ee script been updated to resolve this issue. I have created 5 new sites recently and each of them has the same issue. It requires me to go in and follow this guide.

#41

How to fix ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY in both chrome and firefox. I am a beginner can you please explain me in detailed steps. thanks in advance.

#42

Anyone there? Can you please help me how to fix ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY in both chrome and firefox. My site is opening in internet explorer and safari browser but not opening in chrome and firefox browser. I am a beginner can you please explain me in detailed steps. thanks in advance.

#43

Hello,

just replace the old ssl cipher suite currently used in nginx.conf with the command :

sed -i 's/ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-DSS-AES128-GCM-SHA256:kEDH+AESGCM:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA:ECDHE-ECDSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHADHE-DSS-AES128-SHA256:DHE-RSA-AES256-SHA256:DHE-DSS-AES256-SHA:DHE-RSA-AES256-SHA:ECDHE-RSA-DES-CBC3-SHA:ECDHE-ECDSA-DES-CBC3-SHA:AES128-GCM-SA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:AES:CAMELLIA:DES-CBC3-SHA:!aNULL:!eNULL:!EXPORT:!DES:!RC4:!MD5:!PSK:!ECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA;/ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS;/' /etc/nginx/nginx.conf

Then reload nginx :

nginx -t
service nginx reload
2 Likes
Can not access this site Let’s Encrypt
[HELP] Chrome Error - Some Protocol Error
#44

Problem solved. Thank you so much.

#45

This worked!

#49

Hey, It’s work, thanks

#50

If you are using cloudflare make sure SSL settings are on Stric mode. Helped me to solve ssl errors after migrating sites to new Server.

other than that one time changing the ciphers helped me to solve this. (ciphers is already mentioned in above replies)

#51

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