Verification problem (windows 8)

My domain is:

I ran this command: sudo certbot certonly --standalone -d

It produced this output:correctly created all the *.pem certificates in /etc/…/live/

My web server is (include version): a jupyter notebook server, maybe based on tornado?
see this for more information:
there is a section on using let’s encrypt.
on ‘’ i correctly pointed to fullchain.pem and privkey.pem

The operating system my web server runs on is: ubuntu 16.04 (it’s a vps by digitalocean)

My hosting provider, if applicable, is: domain name is from godaddy

I can login to a root shell on my machine:yes

more: with ufw port 8888 is allowed (same port allowed in ‘’). https is allowed too. and localhost is allowed too.

accessing with chrome from android (my cellphone) or a xubuntu machine (my personal laptop): CA verification is fine

accessing with chrome/explorer/firefox from a windows 8 machine (office PC): i cannot be verified. i get this error: NET::ERR_CERT_COMMON_NAME_INVALID
web certificate comes from [missing_subjectAltName]

any help?

Hi @ste976,

Could you give an example URL that currently gives that error so that we could try for ourselves?

thank you. i solved the problem by installing nginx and configuring nginx to redirect all requests to path /notebook to port 8888 on localhost where jupyter notebook is executed. the rerun certbot to secure nginx by following this:

now it works

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