Cipher mismatch or error in SSL version


Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. |, so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is:

I ran this command:
Unable to access this website from another country when that domain is accessed

It produced this output:
This site can't provide a secure connection
domain uses an unsupported protocol

My web server is (include version):
Apache Http server 2.4.54.r16

The operating system my web server runs on is (include version):
Asustor @ ADM 4.1.0.RLQ1

My hosting provider, if applicable, is:

I can login to a root shell on my machine (yes or no, or I don't know):

I'm using a control panel to manage my site (no, or provide the name and version of the control panel): no

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):
certbot 2.1.0

I've used Let's Encrypt to general a SSL certificate for my webserver hosted on Asustor. But when my domain is accessed from another country(tested using VPN) or from a different network, chrome is saying ERR_SSL_VERSION_OR_CIPHER_MISMATCH.

I also tested SSL certificate using ssl labs

Got grade F :frowning:

Can you please let me know what the issue is?

Hi @mystique, and welcome to the LE community forum :slight_smile:

The problem is within your Asustor device.
How does it manage its' certificates?
Does is use IPv4 and IPv6?

Addresses: 2601:646:9b82:98f0:7a72:64ff:fe40:9f5

I'm not sure about how it manages certificates. I installed let's encrypt for generating the certificate though. It uses IPv4. I haven't enabled IPv6 yet.

DNS shows an IPv6 address.

Is that recommended?
Are you following some guide?


I'm not sure about IPv6. But from this result page, server cannot be connected on that address.

Yes, I'm following this guide

Followed this exactly. Step 3.2 says to get certi from Let's Encrypt.

Well, if you followed the guide...
Then it has failed you.

Let's do some troubleshooting.
Please show:
apachectl -t -D DUMP_VHOSTS


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