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Magento error: Unknown cipher in list: TLSv1

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Last reviewed
Note: This is a historical reference, not a current security baseline. Magento 1 is end-of-life.

On attempt to install some Magento extension via Downloader/Magento Connect it shows the following error message:
Unknown cipher in list: TLSv1

Cause

CURLOPT_SSL_CIPHER_LIST constant is changed to CURLOPT_SSLVERSION with newer curl library.

Solution

Apply the following correction against downloader/lib/Mage/HTTP/Client/Curl.php: 
--- downloader/lib/Mage/HTTP/Client/Curl.php
+++ downloader/lib/Mage/HTTP/Client/Curl.php
@@ -374,7 +374,7 @@
         $this->_ch = curl_init();
         $this->curlOption(CURLOPT_URL, $uriModified);
         $this->curlOption(CURLOPT_SSL_VERIFYPEER, true);
-        $this->curlOption(CURLOPT_SSL_CIPHER_LIST, 'TLSv1');
+        $this->curlOption(CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1);
         $this->getCurlMethodSettings($method, $params, $isAuthorizationRequired);
 
         if(count($this->_headers)) {


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