openssl s_client -connect ubuntu.ru:443 | egrep -i "(protocol|cipher)"
depth=2 O = Digital Signature Trust Co., CN = DST Root CA X3
verify return:1
depth=1 C = US, O = Let's Encrypt, CN = Let's Encrypt Authority X3
verify return:1
depth=0 CN = ubuntu.ru
verify return:1
New, TLSv1.2, Cipher is ECDHE-RSA-AES256-GCM-SHA384
Protocol : TLSv1.2
Cipher : ECDHE-RSA-AES256-GCM-SHA384
поддерживает ли ваша система/браузер TLSv1.2?