I have following problem:
My site is secured with a SSL-certificate from Lets encrypt. Green padlock doesn’t show, https sign is red and crossed.
I tested a site on www. whynopadlock .com : ONE ISSUE :
“You currently have TLSv1 enabled.This version of TLS is being phased out. This warning won’t break your padlock, however if you run an eCommerce site, PCI requirements state that TLSv1 must be disabled by June 30, 2018”
Tested with www. digicert .com : ONE ISSUE : “Certificate does not match name”
Your certificate is only valid for www.allotro.com, not for allotro.com. The certificate should cover both names.
In step 3 of the tutorial that you linked to, it says to use two different -d options in the Certbot command, one for the www form of the name and one for the bare non-www form of the name. It looks like you didn’t do that and only obtained a certificate covering the www form.
You should probably rerun Certbot with both -d options to reissue the certificate with both names covered.
However, the Certificate Transparency history shows that you’ve issued a large number of certificates for your site, some of which (including the most recent) do cover both names.
So before you issue a new certificate, maybe you can look into why your web server isn’t using one of the correct certificates. One thing you could try is running certbot certificates to see the current state of all Certbot-issued certificates on your system.