Fatal error: Uncaught GuzzleHttp\Exception\ConnectException: cURL error 35: Unknown SSL

[LrntL]

Hi,

Since this early morning:

Fatal error: Uncaught GuzzleHttp\Exception\ConnectException: cURL error 35: Unknown SSL protocol error in connection to api.mailjet.com:443 (see https://curl.haxx.se/libcurl/c/libcurl-errors.html) for https://api.mailjet.com/v3.1/send in /var/www/vhosts/my-domain.com/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php:210 Stack trace: #0 /var/www/vhosts/my-domain.com/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php(158): GuzzleHttp\Handler\CurlFactory::createRejection() #1 /var/www/vhosts/my-domain.com/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php(110): GuzzleHttp\Handler\CurlFactory::finishError() #2 /var/www/vhosts/my-domain.com/vendor/guzzlehttp/guzzle/src/Handler/CurlHandler.php(47): GuzzleHttp\Handler\CurlFactory::finish() #3 /var/www/vhosts/my-domain.com/vendor/guzzlehttp/guzzle/src/Handler/Proxy.php(28): GuzzleHttp\Handler\CurlHandler->__invoke() #4 /var/www/vhosts/my-domain.com/vendor/guzzlehttp/guzzle/src/Handler/Proxy.php(48): GuzzleHttp\Handler\Proxy::GuzzleHttp\Handler\{closure}() #5 /var/www/vhosts/mus in /var/www/vhosts/my-domain.com/vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php on line 210

None of the message are sent! Please help !

[Pavlico]

HI @LrntL Im on it :) What version of module are you using? :)

[LrntL]

Thanks and sorry for that. Our IP was blacklisted in Mailjet due to a wrong secret key causing unauthenticated requests.

Solved by a kind assistant (Boris) by support ticket.

However, the error message is very scaring and give no clue about the cause...