0

I've been trying to figure out if my IIS server is using TLS 1.2 for communication since an API I connect to is disabling access for TLS 1.1 next month. Everything I've found on the web is telling me out to edit the registry to enable 1.2 communication, but I want to verify if it is already using it first.

Is there a way, without using regedit to verify if a server is communicating over TLS 1.2?

Improve this question
4
  • 1
    Are you familiar with Wireshark? If you can install Wireshark on either the IIS server or a client, Wireshark can parse the traffic and tell you which version of TLS is being used. Examples: security.stackexchange.com/questions/142939/… and blog.catchpoint.com/2017/05/12/dissecting-tls-using-wireshark
    – Doug Deden
    Sep 16, 2019 at 19:22
  • Chrome will tell you on the Developer Tools under Security, while Firefox will tell you both in it's Developer tools and from the Site Security view accessed by clicking on the padlock in the address bar. IE/Edge may have similar tools.
    – garethTheRed
    Sep 16, 2019 at 20:08
  • Attempt to connect to something that only supports TLS 1.2?
    – Zoredache
    Sep 16, 2019 at 22:35
  • Doesn't this depend on how exactly you are using the API in question? For example, for a client-side javascript API, it is presumably the client's TLS support that counts, not your server's.
    – Harry Johnston
    Sep 18, 2019 at 4:54

0

Reset to default

You must log in to answer this question.

Browse other questions tagged .