Hi

Because SamSung did not update DRIVER for newer Windows OS so I still using Windows XP in my office. However, there is some problems.

Few days ago I installed Let's Encrypt SSL for my blog at https://www.topwebhosting.tech and I always get error when visit from Windows XP, it saids "Your connection is not secure"

I get same error when visit gmail.com but can access mail.google.com

I don't known why and how to fix this issues ?

I tried to update my Windows XP, SEARCH around to find the solution but still can't access many https site from my office

ThanksWhich version of Windows XP?
Here is some recent information about your problem.
http://www.altn.com/Company/PressRoom/2015-01-12-SSL-Update-Notice/
Read CAREFULLY to see if it might work for you.
I am using latest Windows XP service pack 3.

I've checked the link above and the security update from MS is for "Security Update for Windows Server 2003" - https://www.microsoft.com/en-us/download/details.aspx?id=40973

Will it works on Windows XP ?

Regards,Letsencrypt is very new and is therefore not perfectly SUPPORTED by XP. They have information on a WORKAROUND here however this would need to be performed on every client machine running XP, it's not something you can do server-side: https://community.letsencrypt.org/t/which-browsers-and-operating-systems-support-lets-encrypt/4394