{"id":9574,"date":"2026-07-08T20:18:00","date_gmt":"2026-07-08T14:48:00","guid":{"rendered":"https:\/\/example.com\/curl-error-35-ssl-fix"},"modified":"2026-07-08T21:44:59","modified_gmt":"2026-07-08T16:14:59","slug":"curl-error-35-ssl-fix","status":"publish","type":"post","link":"https:\/\/1000sciencefairprojects.com\/tech\/curl-error-35-ssl-fix\/","title":{"rendered":"cURL Error 35: SSL\/TLS Connection Failed &#8211; Complete Fix Guide (2026)"},"content":{"rendered":"<h2 style=\"color: #e74c3c;\"><strong>What is cURL Error 35?<\/strong><\/h2>\n<p><strong>cURL <a href=\"https:\/\/1000sciencefairprojects.com\/tech\/how-to-fix-rge-billing-software-error-delayed-high-bill-guide-2026\/\">Error<\/a> 35<\/strong> is an SSL\/TLS connection error that occurs when the cURL library fails to establish a secure connection with the remote server. The full error message typically reads: <em>&#8220;cURL error 35: SSL connect error&#8221;<\/em> or <em>&#8220;error:1407742E:SSL routines:SSL23_GET_SERVER_HELLO:tlsv1 alert protocol version&#8221;<\/em>. This error is common in PHP applications, API integrations, WordPress sites, and command-line scripts when attempting HTTPS requests.<\/p>\n<div style=\"background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 20px; border-radius: 10px; margin: 20px 0;\">\n<h3 style=\"color: #ffffff; margin-top: 0;\"><strong>Quick Answer: How to Fix cURL Error 35<\/strong><\/h3>\n<p><strong>Update your SSL\/TLS libraries, ensure your system supports TLS 1.2 or higher, verify the remote server&#8217;s SSL certificate is valid, and check that your cURL version is up to date. For immediate <a href=\"https:\/\/1000sciencefairprojects.com\/tech\/fix-youtube-an-error-occurred-playback-id-on-android-tv-iphone\/\">fixes<\/a>, try forcing TLS 1.2 or updating your CA certificate bundle.<\/strong><\/p>\n<\/div>\n<h2 style=\"color: #e74c3c;\"><strong>What Causes cURL Error 35?<\/strong><\/h2>\n<p>Understanding the root causes is essential for effective <a href=\"https:\/\/1000sciencefairprojects.com\/tech\/love-island-network-error-voting-fix-2026\/\">troubleshooting<\/a>:<\/p>\n<ul style=\"list-style-type: disc; padding-left: 20px;\">\n<li><strong>Outdated SSL\/TLS Libraries:<\/strong> Older OpenSSL versions do not support modern TLS protocols<\/li>\n<li><strong>TLS Version Mismatch:<\/strong> Client and server cannot agree on a compatible TLS version<\/li>\n<li><strong>Expired or Invalid SSL Certificates:<\/strong> The remote server&#8217;s certificate has expired or is self-signed<\/li>\n<li><strong>Firewall or Proxy Interference:<\/strong> Network security tools blocking SSL handshakes<\/li>\n<li><strong>Outdated cURL Version:<\/strong> Older cURL builds lack support for newer encryption standards<\/li>\n<li><strong>Missing CA Certificates:<\/strong> The system lacks the root certificates needed to verify SSL<\/li>\n<li><strong>Server-Side SSL Misconfiguration:<\/strong> The remote server has improper SSL settings<\/li>\n<\/ul>\n<h2 style=\"color: #e74c3c;\"><strong>How to Fix cURL Error 35: Step-by-Step Solutions<\/strong><\/h2>\n<h3 style=\"color: #3498db;\"><strong>Method 1: Update cURL and OpenSSL<\/strong><\/h3>\n<p>Outdated libraries are the most common cause of Error 35. Update them:<\/p>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0; box-shadow: 0 2px 15px rgba(0,0,0,0.1);\">\n<thead>\n<tr style=\"background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white;\">\n<th style=\"padding: 15px; text-align: left; border: 1px solid #ddd;\">Operating System<\/th>\n<th style=\"padding: 15px; text-align: left; border: 1px solid #ddd;\">Update Command<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color: #f8f9fa;\">\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>Ubuntu\/Debian<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><code>sudo apt-get update &amp;&amp; sudo apt-get install curl openssl libssl-dev<\/code><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>CentOS\/RHEL<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><code>sudo yum update curl openssl openssl-devel<\/code><\/td>\n<\/tr>\n<tr style=\"background-color: #f8f9fa;\">\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>macOS (Homebrew)<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><code>brew upgrade curl openssl<\/code><\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>Windows<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">Download latest cURL from <a href=\"https:\/\/curl.se\/windows\/\" target=\"_blank\" rel=\"noopener noreferrer\">curl.se<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3 style=\"color: #3498db;\"><strong>Method 2: Force TLS 1.2 or Higher<\/strong><\/h3>\n<p>Many servers now require TLS 1.2 minimum. Force the correct version:<\/p>\n<ul style=\"list-style-type: disc; padding-left: 20px;\">\n<li><strong>Command Line:<\/strong> <code>curl --tlsv1.2 https:\/\/1000sciencefairprojects.com\/tech\/<\/code><\/li>\n<li><strong>PHP cURL:<\/strong> <code>curl_setopt($ch, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2);<\/code><\/li>\n<li><strong>Python requests:<\/strong> Use <code>requests.get(url, ssl_version=ssl.PROTOCOL_TLSv1_2)<\/code><\/li>\n<\/ul>\n<div style=\"text-align: center; margin: 20px 0;\"><a style=\"background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white; padding: 15px 30px; text-decoration: none; border-radius: 25px; font-weight: bold; display: inline-block; box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);\" href=\"https:\/\/curl.se\/docs\/sslcerts.html\" target=\"_blank\" rel=\"noopener noreferrer\">View SSL Certificate Guide<\/a><\/div>\n<h3 style=\"color: #3498db;\"><strong>Method 3: Update CA Certificate Bundle<\/strong><\/h3>\n<p>Missing or outdated CA certificates cause verification failures:<\/p>\n<ul style=\"list-style-type: disc; padding-left: 20px;\">\n<li><strong>Download latest CA bundle:<\/strong> From <a href=\"https:\/\/curl.se\/ca\/cacert.pem\" target=\"_blank\" rel=\"noopener noreferrer\">curl.se\/ca\/cacert.pem<\/a><\/li>\n<li><strong>PHP:<\/strong> Update <code>curl.cainfo<\/code> and <code>openssl.cafile<\/code> in php.ini<\/li>\n<li><strong>cURL command line:<\/strong> Use <code>--cacert \/path\/to\/cacert.pem<\/code><\/li>\n<li><strong>Verify path:<\/strong> Check <code>php -i | grep cafile<\/code> for correct location<\/li>\n<\/ul>\n<h3 style=\"color: #3498db;\"><strong>Method 4: Check SSL Certificate Validity<\/strong><\/h3>\n<p>Verify the remote server&#8217;s certificate is not expired:<\/p>\n<ul style=\"list-style-type: disc; padding-left: 20px;\">\n<li><strong>Test with OpenSSL:<\/strong> <code>openssl s_client -connect 1000sciencefairprojects.com\/tech\/ -servername 1000sciencefairprojects.com\/tech\/<\/code><\/li>\n<li><strong>Check expiration:<\/strong> Look for &#8220;Verify return code: 0 (ok)&#8221;<\/li>\n<li><strong>Use SSL Labs:<\/strong> Test at <a href=\"https:\/\/www.ssllabs.com\/ssltest\/\" target=\"_blank\" rel=\"noopener noreferrer\">SSL Labs<\/a><\/li>\n<li><strong>Verify certificate chain:<\/strong> Ensure all intermediate certificates are present<\/li>\n<\/ul>\n<h3 style=\"color: #3498db;\"><strong>Method 5: Disable SSL Verification (Temporary Debug Only)<\/strong><\/h3>\n<p><strong>Warning:<\/strong> Only use this for testing, never in production:<\/p>\n<ul style=\"list-style-type: disc; padding-left: 20px;\">\n<li><strong>Command Line:<\/strong> <code>curl -k https:\/\/1000sciencefairprojects.com\/tech\/<\/code> or <code>curl --insecure<\/code><\/li>\n<li><strong>PHP:<\/strong> <code>curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);<\/code><\/li>\n<li><strong>Always re-enable<\/strong> verification after identifying the issue<\/li>\n<\/ul>\n<h3 style=\"color: #3498db;\"><strong>Method 6: Check Firewall and Proxy Settings<\/strong><\/h3>\n<p>Network security tools can interfere with SSL handshakes:<\/p>\n<ul style=\"list-style-type: disc; padding-left: 20px;\">\n<li><strong>Temporarily disable firewall<\/strong> to test if it is the cause<\/li>\n<li><strong>Configure proxy settings:<\/strong> <code>curl -x proxy:port https:\/\/1000sciencefairprojects.com\/tech\/<\/code><\/li>\n<li><strong>Check corporate proxies:<\/strong> Some intercept and re-encrypt SSL traffic<\/li>\n<li><strong>Whitelist the domain<\/strong> in your security software<\/li>\n<\/ul>\n<h3 style=\"color: #3498db;\"><strong>Method 7: Verify Server-Side SSL Configuration<\/strong><\/h3>\n<p>If you control the server, check these settings:<\/p>\n<ul style=\"list-style-type: disc; padding-left: 20px;\">\n<li><strong>Enable TLS 1.2 and 1.3:<\/strong> Disable SSLv3 and TLS 1.0\/1.1<\/li>\n<li><strong>Update server certificate:<\/strong> Renew if expired<\/li>\n<li><strong>Install intermediate certificates:<\/strong> Complete the certificate chain<\/li>\n<li><strong>Check cipher suites:<\/strong> Ensure compatibility with client libraries<\/li>\n<\/ul>\n<h2 style=\"color: #e74c3c;\"><strong>cURL Error 35: Platform-Specific Fixes<\/strong><\/h2>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0; box-shadow: 0 2px 15px rgba(0,0,0,0.1);\">\n<thead>\n<tr style=\"background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%); color: white;\">\n<th style=\"padding: 15px; text-align: left; border: 1px solid #ddd;\">Platform<\/th>\n<th style=\"padding: 15px; text-align: left; border: 1px solid #ddd;\">Specific Solution<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color: #f8f9fa;\">\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>WordPress<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">Update WordPress core, plugins, and themes. Check SSL plugin settings. Verify hosting provider supports TLS 1.2+<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>PHP Applications<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">Update PHP to 7.4+ or 8.x. Set curl.cainfo in php.ini. Use stream_context_set_default for SSL options<\/td>\n<\/tr>\n<tr style=\"background-color: #f8f9fa;\">\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>Linux Servers<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">Update OpenSSL with package manager. Rebuild cURL against new OpenSSL. Check \/etc\/ssl\/certs\/ directory<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>Windows WAMP\/XAMPP<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">Download cacert.pem and place in php\/extras\/ssl\/. Update php.ini to point to this file<\/td>\n<\/tr>\n<tr style=\"background-color: #f8f9fa;\">\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><strong>Docker Containers<\/strong><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">Update base image. Install ca-certificates package. Mount host CA bundle if needed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2 style=\"color: #e74c3c;\"><strong>How to Prevent cURL Error 35<\/strong><\/h2>\n<ul style=\"list-style-type: disc; padding-left: 20px;\">\n<li><strong>Keep cURL and OpenSSL updated<\/strong> to latest stable versions<\/li>\n<li><strong>Monitor certificate expiration dates<\/strong> and set renewal reminders<\/li>\n<li><strong>Use TLS 1.2 or higher<\/strong> for all connections<\/li>\n<li><strong>Regularly update CA certificate bundles<\/strong><\/li>\n<li><strong>Test SSL configuration<\/strong> with <a href=\"https:\/\/www.ssllabs.com\/ssltest\/\" target=\"_blank\" rel=\"noopener noreferrer\">SSL Labs<\/a> monthly<\/li>\n<li><strong>Document proxy and firewall rules<\/strong> for your network<\/li>\n<\/ul>\n<h2 style=\"color: #e74c3c;\"><strong>Common cURL Error 35 Variations<\/strong><\/h2>\n<table style=\"width: 100%; border-collapse: collapse; margin: 20px 0; box-shadow: 0 2px 15px rgba(0,0,0,0.1);\">\n<thead>\n<tr style=\"background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); color: white;\">\n<th style=\"padding: 15px; text-align: left; border: 1px solid #ddd;\">Error Message<\/th>\n<th style=\"padding: 15px; text-align: left; border: 1px solid #ddd;\">Meaning<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"background-color: #f8f9fa;\">\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><code>SSL connect error<\/code><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">General SSL handshake failure<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><code>tlsv1 alert protocol version<\/code><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">TLS version mismatch &#8211; server requires newer TLS<\/td>\n<\/tr>\n<tr style=\"background-color: #f8f9fa;\">\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><code>certificate verify failed<\/code><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">CA certificate missing or invalid<\/td>\n<\/tr>\n<tr>\n<td style=\"padding: 12px; border: 1px solid #ddd;\"><code>sslv3 alert handshake failure<\/code><\/td>\n<td style=\"padding: 12px; border: 1px solid #ddd;\">Cipher suite mismatch between client and server<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<div style=\"background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%); color: white; padding: 20px; border-radius: 10px; margin: 20px 0;\">\n<h3 style=\"color: #ffffff; margin-top: 0;\"><strong>TL;DR &#8211; Quick Fix Summary<\/strong><\/h3>\n<p><strong>cURL Error 35 is an SSL\/TLS connection error fixed by:<\/strong><\/p>\n<ul style=\"list-style-type: disc; padding-left: 20px; color: white;\">\n<li>Updating cURL and OpenSSL to latest versions<\/li>\n<li>Forcing TLS 1.2 or higher in your requests<\/li>\n<li>Updating CA certificate bundle<\/li>\n<li>Checking SSL certificate validity on the remote server<\/li>\n<li>Verifying firewall\/proxy is not blocking SSL handshakes<\/li>\n<\/ul>\n<p><strong>Start with Method 1 (update libraries) and Method 2 (force TLS 1.2) for fastest resolution.<\/strong><\/p>\n<\/div>\n<p><em>Related: <a href=\"https:\/\/curl.se\/docs\/sslcerts.html\" target=\"_blank\" rel=\"noopener noreferrer\">cURL SSL Certificates Documentation<\/a> | <a href=\"https:\/\/www.openssl.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">OpenSSL Project<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Fix cURL Error 35 (SSL connect error) with 7 proven solutions. Troubleshoot SSL\/TLS handshake failures, certificate issues and connection errors. Updated 2026.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[334,337,338,335,336,339],"class_list":["post-9574","post","type-post","status-publish","format-standard","hentry","category-error-fix","tag-curl","tag-openssl","tag-php","tag-ssl","tag-tls","tag-wordpress"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>cURL Error 35: SSL\/TLS Connection Fix Guide (2026) | 7 Working Solutions<\/title>\n<meta name=\"description\" content=\"Fix cURL Error 35 (SSL connect error) with 7 proven solutions. Troubleshoot SSL\/TLS handshake failures, certificate issues and connection errors. 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Troubleshoot SSL\/TLS handshake failures, certificate issues and connection errors. 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