Support » Fixing WordPress » Updates Failing with Curl “Invalid Algorithm” Error

  • I received a report tonight that our customers are no longer able to update their sites. This has been a stable CENTOS 7.3 server for the past year. Over the weekend there were significant package updates to 7.4

    WordPress sites are working perfectly with the following notable exception.

    The following error message is typical and is not specific to any single plugin or even to a single site installed on our server. This site was running WP 4.5.9

    `
    Updating Plugin Easy WP SMTP (1/1)
    Downloading update from http://downloads.wordpress.org/plugin/easy-wp-smtp.zip…
    An error occurred while updating Easy WP SMTP: Download failed. security library: invalid algorithm.
    `

    Sites running WP 4.8.1 show a variant of the error as follows.

    “An error occured while updating Akismet Ani-Spam: Download failed. cURL error 35: security library: invalid algorithm.”

    The sites each run in a chroot environment, but SSH to the jail environment confirms that cURL is working correctly from the command line. We can manually download the plugins using either wget or curl. phpinfo() shows the same version of cURL as what the command line reports.

    There are no errors showing up in the php-fpm or apache logs.

    Is anyone else seeing similar behaviour?

    Any suggestions for paths to troubleshoot this would be greatly appreciated.

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