Lets Encrypt does not work on Android browsers


I have installed Lets Encrypt on Plesk 17. It runs Apache 2.4.
The problem is that my webpage does not work with the Lets Encrypt certificate on Android browsers. I have found a solution, but I do not know how I have to make the solution. What do I need to do to make my website work on Android with https?



What’s your domain name ? I’m guessing you probably didn’t include in the CA intermediate cert into your config.

What config do you mean?
I had installed Lets Encript on plesk , not on a other way.

Your site is working fine on my android browser.

What error are you getting ?

I did find one which gave an error “ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY” This is nothing to do with the certificate, rather the server configuration you have. Is this on a shared server ? or do you have root access ?

I habe root access.
ERR_SPDY_INADEQUATE_TRANSPORT_SECURITY is the error in my Browser. Its the Browser on Android with the world globe on it.

The good news is this is not related to the certificate from Let’s Encrypt - its the configuration on your server.

I don’t use plesk, let me see what I can find to change the configuration in the right way. (or if someone else knows, they can reply here )

1 Like

Thank you!

Do you speak german?

I found this but i does not work

That link is to a different error.

I can understand basic german - but can’t write it. I can order a beer or meal - the important things :wink:

Does your nginx (I think you are using nginx, correct me if I’m wrong) have “listen 443 ssl spdy;” in the config. If so, could you try just temporarily removing the “spdy” and restarting nginx and testing ?

I use apache but nginx works also.
Where can i find the spdy?

Interesting, your site responds saying it's nginx;

curl -I https://minefreaks.de
HTTP/1.1 200 OK
Server: nginx
Date: Wed, 02 Nov 2016 16:44:46 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
X-UA-Compatible: IE=edge
X-Frame-Options: SAMEORIGIN
Set-Cookie: wcf21_cookieHash=84a742bfd4685f1f3eddc49ec146aeb9568b38fa; path=/; domain=minefreaks.de; secure; HttpOnly
X-Powered-By: PleskLin
MS-Author-Via: DAV

What is your operating system ?


Debian 8 is the operating system

I can’t find any spdv.

I think in plesk you can set things in server.com:8443/admin/server/optimization-settings

in debian, and apache the protocols are typicically defined in /etc/apache2/mods-available/ssl.conf (I’d change it through plesk though, as I suspect that updates and overwrites the config.

At server.com:8443/admin/server/optimization-setting are settings of apache.
At ssl.conf there are no spdv

And you are certain you are running with apache ( and not an nginx first - as a reverse proxy ) ? as your system reports it's running nginx ...

curl -I https://minefreaks.de
HTTP/1.1 200 OK
Server: nginx

This is a good question.
I think i use both

OK, so I suspect you have nginx set up as a reverse proxy, and then you are using apache.

The interface between the user and your server on https though is with nginx - so it’s the nginx config you need to check.


Do you have Teamspeak?
It is easyer to speak

I don’t, no, sorry

(this needs to be 20 characters long, so adding text :wink: )