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If you are using PHP cURL, you need to be using PHP 5.6 or newer to have the correct TLS versions available.
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I am using PHP 7.0 so I should be fine on that front. <br />
<br />
So is it a setting that needs to be set? (e.g. in the php.ini or something).<br />
Or what is it that I need to do to insure that I am using a specific TLS version?<br />
<br />
Thanks.
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Thanks for the excellent advice. I have two servers that access MailChimp. One is running PhP 5.4, the other is running 7.0. Mailchimp is probably seeing the one running 5.4 and giving me that warning in light of that. I will be phasing out that server in the next two weeks so that should take care of it. <br />
<br />
Thanks again. You guys are great with your advice. Keeps me coming back to Experts Exchange.
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I just received this notification from MailChimp.<br />
<br />

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<i>We strongly encourage any developers who are using the MailChimp API to ensure that their software supports negotiating TLS 1.2 connections, and to coordinate with their system administrators to update software to take advantage of newer TLS versions. In addition, we recommend proactively switching over to TLS 1.2 when communicating with MailChimp’s API by modifying your API client software to enforce TLS 1.2 negotiation.</i>
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<br />
I have written some code in PHP that makes an API call to MailChimp. I'm not sure how to tell or know if I am using TLS 1.2 to communicate with their API.<br />
<br />
How does one make sure you are or find out what protocol you are using?
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I just received this notification from MailChimp.

We strongly encourage any developers who are using the MailChimp API to ensure that their software supports negotiating TLS 1.2 connections, and to coordinate with their system administrators to update software to take advantage of newer TLS versions. In addition, we recommend proactively switching over to TLS 1.2 when communicating with MailChimp’s API by modifying your API client software to enforce TLS 1.2 negotiation.

I have written some code in PHP that makes an API call to MailChimp. I'm not sure how to tell or know if I am using TLS 1.2 to communicate with their API.

How does one make sure you are or find out what protocol you are using?

Forcing TLS 1.2 to Communicate with Remote API

tls/ssl

Mailchimp is an email marketing solution to manage subscribers, send emails, and track results. Mailchimp offers various integrations across other platforms.

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PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.

HTTPS is a protocol for secure communication over a computer network which is widely used on the Internet. HTTPS consists of communication over Hypertext Transfer Protocol (HTTP) within a connection encrypted by Transport Layer Security (TLS) or its predecessor, Secure Sockets Layer (SSL). The main motivation for HTTPS is authentication of the visited website and to protect the privacy and integrity of the exchanged data. HTTPS is widely used for protecting page authenticity on all types of websites, securing accounts and keeping user communications, identity and web browsing private.