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Editorial Team
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Asked: 2026-06-03T18:16:10+00:00

Fatal error : Uncaught CurlException: 60: Peer certificate cannot be authenticated with known CA

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Fatal error: Uncaught CurlException: 60: Peer certificate cannot be authenticated with known CA certificates thrown in /home/ldr/public_html/src/base_facebook.php on line 886

See: http://ldr.x10.bz/examples/with_js_sdk.php

I’ve been getting this error for 2 days now and can’t find any information on where it has come from? Why is the certificate known and is there a way for it to be unknown again?

It had been working for months previously, so not sure if the API has just updated but I’ve deleted everything and just uploaded the PHP SDK 3.1.1 but still no luck 🙁

I’ve read about disabling the peer verification but sounds like a bad idea (plus I know it works with it enabled). Probably accidentally unchecked a box somewhere- any ideas on how to restore it back to normal would be very appreciated 🙂

Thanks!

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1 Answer

  1. Editorial Team

    Certificates are verified against a truststore somewhere on your system. This truststore should be updated once in a while; e.g. Firefox and Windows do this when updating the software. The error is a bit unclear; it actually means your curl client gets a certificate for which it does not have a trusted (root) certificate.

    You may want to visit that site with your favorite up to date browser and save the root certificate somewhere, then create a CA store with that single certificate in it. Of course it will fail if that one gets replaced or if the server chooses another certificate authority.

    Possibly updating curl or the OpenSSL library may do the trick, try that first :).

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