cURL error 60: SSL certificate: unable to get local issuer certificate

How to solve this problem:

download and extract cacert.pem following the instructions at https://curl.se/docs/caextract.html

save it on your filesystem somewhere (for example, XAMPP users might use C:\xampp\php\extras\ssl\cacert.pem)

in your php.ini, put this file location in the [curl] section (putting it in the [openssl] section is also a good idea):

[curl]
curl.cainfo = "C:\xampp\php\extras\ssl\cacert.pem"

[openssl]
openssl.cafile = "C:\xampp\php\extras\ssl\cacert.pem"

restart your webserver (e.g. Apache) and PHP FPM server if applicable

(Reference: https://laracasts.com/discuss/channels/general-discussion/curl-error-60-ssl-certificate-problem-unable-to-get-local-issuer-certificate)

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Attention Wamp/Wordpress/windows users. I had this issue for hours and not even the correct answer was doing it for me, because i was editing the wrong php.ini file because the question was answered to XAMPP and not for WAMP users, even though the question was for WAMP.

here's what i did

Download the certificate bundle.

Put it inside of C:\wamp64\bin\php\your php version\extras\ssl

Make sure the file mod_ssl.so is inside of C:\wamp64\bin\apache\apache(version)\modules

Enable mod_ssl in httpd.conf inside of Apache directory C:\wamp64\bin\apache\apache2.4.27\conf

Enable php_openssl.dll in php.ini. Be aware my problem was that I had two php.ini files and I need to do this in both of them. First one can be located inside of your WAMP taskbar icon here.

https://i.stack.imgur.com/GjJfG.png

and the other one is located in C:\wamp64\bin\php\php(Version)

find the location for both of the php.ini files and find the line curl.cainfo = and give it a path like this

curl.cainfo = "C:\wamp64\bin\php\php(Version)\extras\ssl\cacert.pem"

Now save the files and restart your server and you should be good to go

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If you are using PHP 5.6 with Guzzle, Guzzle has switched to using the PHP libraries autodetect for certificates rather than it's process (ref). PHP outlines the changes here.

Finding out Where PHP/Guzzle is Looking for Certificates

You can dump where PHP is looking using the following PHP command:

 var_dump(openssl_get_cert_locations());

Getting a Certificate Bundle

For OS X testing, you can use homebrew to install openssl brew install openssl and then use openssl.cafile=/usr/local/etc/openssl/cert.pem in your php.ini or Zend Server settings (under OpenSSL).

A certificate bundle is also available from curl/Mozilla on the curl website: https://curl.haxx.se/docs/caextract.html

Telling PHP Where the Certificates Are

Once you have a bundle, either place it where PHP is already looking (which you found out above) or update openssl.cafile in php.ini. (Generally, /etc/php.ini or /etc/php/7.0/cli/php.ini or /etc/php/php.ini on Unix.)

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Guzzle, which is used by cartalyst/stripe, will do the following to find a proper certificate archive to check a server certificate against:

Check if openssl.cafile is set in your php.ini file. Check if curl.cainfo is set in your php.ini file. Check if /etc/pki/tls/certs/ca-bundle.crt exists (Red Hat, CentOS, Fedora; provided by the ca-certificates package) Check if /etc/ssl/certs/ca-certificates.crt exists (Ubuntu, Debian; provided by the ca-certificates package) Check if /usr/local/share/certs/ca-root-nss.crt exists (FreeBSD; provided by the ca_root_nss package) Check if /usr/local/etc/openssl/cert.pem (OS X; provided by homebrew) Check if C:\windows\system32\curl-ca-bundle.crt exists (Windows) Check if C:\windows\curl-ca-bundle.crt exists (Windows)

You will want to make sure that the values for the first two settings are properly defined by doing a simple test:

echo "openssl.cafile: ", ini_get('openssl.cafile'), "\n";
echo "curl.cainfo: ", ini_get('curl.cainfo'), "\n";

Alternatively, try to write the file into the locations indicated by #7 or #8.

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If you're unable to change php.ini you could also point to the cacert.pem file from code like this:

$http = new GuzzleHttp\Client(['verify' => '/path/to/cacert.pem']);
$client = new Google_Client();
$client->setHttpClient($http);

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What i did was use var_dump(openssl_get_cert_locations()); die; in any php script, which gave me the information about defaults that my local php was using:

array (size=8)
  'default_cert_file' => string 'c:/openssl-1.0.1c/ssl/cert.pem' (length=30)
  'default_cert_file_env' => string 'SSL_CERT_FILE' (length=13)
  'default_cert_dir' => string 'c:/openssl-1.0.1c/ssl/certs' (length=27)
  'default_cert_dir_env' => string 'SSL_CERT_DIR' (length=12)
  'default_private_dir' => string 'c:/openssl-1.0.1c/ssl/private' (length=29)
  'default_default_cert_area' => string 'c:/openssl-1.0.1c/ssl' (length=21)
  'ini_cafile' => string 'E:\xampp\php\extras\ssl\cacert.pem' (length=34)
  'ini_capath' => string '' (length=0)

As you can notice, i have set the ini_cafile or the ini option curl.cainfo. But in my case, curl would try to use the "default_cert_file" which did not exist.

I copied the file from https://curl.haxx.se/ca/cacert.pem into the location for "default_cert_file" (c:/openssl-1.0.1c/ssl/cert.pem) and i was able to get it to work.

This was the only solution for me.

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I had this problem appear out-of-the-blue one day, when a Guzzle(5) script was attempting to connect to a host over SSL. Sure, I could disable the VERIFY option in Guzzle/Curl, but that's clearly not the correct way to go.

I tried everything listed here and in similar threads, then eventually went to terminal with openssl to test against the domain with which I was trying to connect:

openssl s_client -connect example.com:443 

... and received first few lines indicating:

CONNECTED(00000003)
depth=0 CN = example.com
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 CN = example.com
verify error:num=21:unable to verify the first certificate
verify return:1 

... while everything worked fine when trying other destinations (ie: google.com, etc)

This prompted me to contact the domain I had been trying to connect to, and indeed, they had a problem on THEIR END that had crept up. It was resolved and my script went back to working.

So... if you're pulling your hair out, give openssl a shot and see if there's anything up with the response from the location you are attempting to connect. Maybe the issue isn't so 'local' after all sometimes.

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Be sure that you open the php.ini file directly by your Window Explorer. (in my case: C:\DevPrograms\wamp64\bin\php\php5.6.25).

Don't use the shortcut to php.ini in the Wamp/Xamp icon's menu in the System Tray. This shortcut doesn't work in this case.

Then edit that php.ini :

curl.cainfo ="C:/DevPrograms/wamp64/bin/php/cacert.pem" 

and

openssl.cafile="C:/DevPrograms/wamp64/bin/php/cacert.pem"

After saving php.ini you don't need to "Restart All Services" in Wamp icon or close/re-open CMD.

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Have you tried..

curl_setopt($process, CURLOPT_SSL_VERIFYPEER, false);

If you would like to risk being hit by a man-in-the-middle attack, you can skip the verify.

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I found a solution that worked for me. I downgraded from the latest guzzle to version ~4.0 and it worked.

In composer.json add "guzzlehttp/guzzle": "~4.0"

Hope it helps someone

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For WAMP, this is what finally worked for me.
While it is similar to others, the solutions mentioned on this page, and other locations on the web did not work. Some "minor" detail differed.
Either the location to save the PEM file mattered, but was not specified clearly enough.
Or WHICH php.ini file to be edited was incorrect. Or both.
I'm running a 2020 installation of WAMP 3.2.0 on a Windows 10 machine.

Link to get the pem file:

http://curl.haxx.se/ca/cacert.pem
Copy the entire page and save it as: cacert.pem, in the location mentioned below.

Save the PEM file in this location

<wamp install directory>\bin\php\php<version>\extras\ssl
eg saved file and path: "T:\wamp64\bin\php\php7.3.12\extras\ssl\cacert.pem"

*(I had originally saved it elsewhere (and indicated the saved location in the php.ini file, but that did not work). There might, or might not be, other locations also work. This was the recommended location - I do not know why.)

WHERE
<wamp install directory> = path to your WAMP installation.
eg: T:\wamp64\

<php version> of php that WAMP is running: (to find out, goto: WAMP icon tray -> PHP <version number>
if the version number shown is 7.3.12, then the directory would be: php7.3.12)
eg: php7.3.12

Which php.ini file to edit

To open the proper php.ini file for editing, goto: WAMP icon tray -> PHP -> php.ini.
eg: T:\wamp64\bin\apache\apache2.4.41\bin\php.ini
NOTE: it is NOT the file in the php directory!

Update:
While it looked like I was editing the file: T:\wamp64\bin\apache\apache2.4.41\bin\php.ini,
it was actually editing that file's symlink target: T:/wamp64/bin/php/php7.3.12/phpForApache.ini.

Note that if you follow the above directions, you are NOT editing a php.ini file directly. You are actually editing a phpForApache.ini file. (a post with info about symlinks)

If you read the comments at the top of some of the php.ini files in various WAMP directories, it specifically states to NOT EDIT that particular file.
Make sure that the file you do open for editing does not include this warning.

Installing the extension Link Shell Extension allowed me to see the target of the symlink in the file Properites window, via an added tab. here is an SO answer of mine with more info about this extension.

If you run various versions of php at various times, you may need to save the PEM file in each relevant php directory.

The edits to make in your php.ini file:

Paste the path to your PEM file in the following locations.

uncomment ;curl.cainfo = and paste in the path to your PEM file. eg: curl.cainfo = "T:\wamp64\bin\php\php7.3.12\extras\ssl\cacert.pem"

uncomment ;openssl.cafile= and paste in the path to your PEM file. eg: openssl.cafile="T:\wamp64\bin\php\php7.3.12\extras\ssl\cacert.pem"

Credits:

While not an official resource, here is a link back to the YouTube video that got the last of the details straightened out for me: https://www.youtube.com/watch?v=Fn1V4yQNgLs.

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All of the answers are correct ; but the most important thing is You have to find the right php.ini file. check this command in cmd " php --ini " is not the right answer for finding the right php.ini file.

if you edit

curl.cainfo ="PATH/cacert.pem"

and check

var_dump(openssl_get_cert_locations()); 

then curl.cainfo should have a value. if not then that's not right php.ini file;

*I recommend you to search *.ini in wamp/bin or xxamp/bin or any server you use and change them one by one and check it. *

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I spent too much time to figure out this problem for me.

I had PHP version 5.5 and I needed to upgrade to 5.6.

In versions < 5.6 Guzzle will use it's own cacert.pem file, but in higher versions of PHP it will use system's cacert.pem file.

I also downloaded file from here https://curl.haxx.se/docs/caextract.html and set it in php.ini.

Answer found in Guzzles StreamHandler.php file https://github.com/guzzle/guzzle/blob/0773d442aa96baf19d7195f14ba6e9c2da11f8ed/src/Handler/StreamHandler.php#L437

// PHP 5.6 or greater will find the system cert by default. When // < 5.6, use the Guzzle bundled cacert.

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For those of you who are trying to use Wordpress's application password functionality on your local machine. You need to update the wp-includes\certificates\ca-bundle.crt

Open this file in a text editor and append your server's certificate.

Open your self-signed certificate(.crt) file and Copy all between and including

----BEGIN CERTIFICATE-----

-----END CERTIFICATE-----

Paste at the end of the wp-includes\certificates\ca-bundle.crt

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I just experienced this same problem with the Laravel 4 php framework which uses the guzzlehttp/guzzle composer package. For some reason, the SSL certificate for mailgun stopped validating suddenly and I got that same "error 60" message.

If, like me, you are on a shared hosting without access to php.ini, the other solutions are not possible. In any case, Guzzle has this client initializing code that would most likely nullify the php.ini effects:

// vendor/guzzlehttp/guzzle/src/Client.php
    $settings = [
        'allow_redirects' => true,
        'exceptions'      => true,
        'decode_content'  => true,
        'verify'          => __DIR__ . '/cacert.pem'
    ];

Here Guzzle forces usage of its own internal cacert.pem file, which is probably now out of date, instead of using the one provided by cURL's environment. Changing this line (on Linux at least) configures Guzzle to use cURL's default SSL verification logic and fixed my problem:

Since the files in vendor are not meant to be tampered with, a better solution would be to configure the Guzzle client on usage, but this was just too difficult to do in Laravel 4.

Hope this saves someone else a couple hours of debugging...

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This might be an edge case, but in my case the problem was not the client conf (I already had curl.cainfo configured in php.ini), but rather the remote server not being configured properly:

It did not send any intermediate certs in the chain. There was no error browsing the site using Chrome, but with PHP I got following error.

cURL error 60

After including the Intermediate Certs in the remote webserver configuration it worked.

You can use this site to check the SSL configuration of your server:

https://whatsmychaincert.com/

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when I run 'var_dump(php_ini_loaded_file());' I get this output on my page 'C:\Development\bin\apache\apache2.4.33\bin\php.ini' (length=50)'

and to get php to load my cert file I had to edit the php.ini in this path 'C:\Development\bin\apache\apache2.4.33\bin\php.ini' and add openssl.cafile="C:/Development/bin/php/php7.2.4/extras/ssl/cacert.pem" where I had downloaded and place my cert file from https://curl.haxx.se/docs/caextract.html

am on windows 10, using drupal 8, wamp and php7.2.4

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I'm using Centos 7 with the free version of virtualmin. With Virtualmin you can create a wordpress website. There is functionality that will automatically update your ssl certificate for you. I noticed that /etc/httpd/conf/httpd.conf did not contain an entry for SSLCertificateChainFile. Which should be set to something like /home/websitename/ssl.combined. Updating that file accordingly and restarting apache fix this problem for me. I discovered my issue trying to install a jetpack plugin for wordpress. A search on the internet led me to realize that I didn't have SSL Configured. I followed Redhat's instructions on how to install a certificate. I hope this was useful to someone.

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I have a proper solution of this problem, lets try and understand the root cause of this issue. This issue comes when remote servers ssl cannot be verified using root certificates in your system's certificate store or remote ssl is not installed along with chain certificates. If you have a linux system with root ssh access, then in this case you can try updating your certificate store with below command:

update-ca-certificates

If still, it doesn't work then you need to add root and interim certificate of remote server in your cert store. You can download root and intermediate certs and add them in /usr/local/share/ca-certificates directory and then run command update-ca-certificates. This should do the trick. Similarly for windows you can search how to add root and intermediate cert.

The other way you can solve this problem is by asking remote server team to add ssl certificate as a bundle of domain root cert, intermediate cert and root cert.

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Guzzle Version 5

This default config is working good for mine. It will disable https required.

  $options = [
    'defaults' => ['verify' => false],
  ];
  new GuzzleClient($options);

In other case, you want to set path of ca, change to:

['verify' => '/path/to/cacert.pem']

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As you are using Windows, I think your path separator is '\' (and '/' on Linux). Try using the constant DIRECTORY_SEPARATOR. Your code will be more portable.

Try:

curl_setopt($process, CURLOPT_CAINFO, dirname(__FILE__) . DIRECTORY_SEPARATOR . 'cacert.pem');

EDIT: and write the full path. I had some issues with relative paths (perhaps curl is executed from another base directory?)

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if you use WAMP you should also add the certificate line in php.ini for Apache (besides the default php.ini file):

[curl]
curl.cainfo = C:\your_location\cacert.pem

works for php5.3+

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