Support » Plugin: Really Simple SSL » Let’s Encrypt – intermediate certificates has expired (21 days ago)

  • Resolved surgeatduk92


    NOTE: The Really Simple SSL plugin is currently deactivated on this website.

    I installed the plugin yesterday on a new website that has never had a SSL Cert. I generated a Let’s Encrypt cert and uploaded the cert and key files to the hosting, everything installed correctly.

    After switching over to HTTPS I encountered problems which did not resolve so I followed the deactivation process to get the site working again as HTTP.

    I think the problem is due to the R3 intermediate certificates has expired (21 days ago) error.

    It seems the intermediate cert was Valid from October 7, 2020 to September 29, 2021. After searching I have found this is a current issue with Let’s Encrypt.

    Can you tell me the best way to get round this so I can reactivate the certificate?

    The page I need help with: [log in to see the link]

Viewing 5 replies - 1 through 5 (of 5 total)
  • Plugin Contributor Mark


    Hi @surgeatduk92,

    this issue can be fixed by replacing the intermediate certificate bundle with an updated version. This bundle is included when generating a certificate using Really Simple SSL and is called the CABUNDLE. It is available once the Let’s Encrypt wizard has been completed. The CABUNDLE can usually be updated in the same place where you have added the CRT and KEY files in your hosting control panel.

    Thread Starter surgeatduk92


    Thank you for your quick reply. It doesn’t look like there is a facility to upload the CABUNDLE file in the hosting for this site so I will have to contact the hosting company.

    Is it possible to download the CABUNDLE as I didn’t do that when I downloaded the others, do I have to delete the cert from the hosting and start again?

    Plugin Contributor Mark


    Hi @surgeatduk92,

    you can get the intermediate certificate bundle from this page: The active Let’s Encrypt R3 should be the one. Your hosting provider can add this for you.

    I have a similar problem and I don’t know how to fix it.
    Since September 30, some devices cannot see correctly with https. When we try to access, the site says it is not secure. The server provider has uploaded ISRG Root X1, valid until Monday June 4, 2035, but on my computer (updated macbook air 2018) and some other devices the site is not secure.
    I don’t know if this is a good explanation. Sorry, my knowledge of english and ssl are terrible.

    Plugin Author Rogier Lankhorst


    This may happen if you generated your certificate with another plugin than Really Simple SSL. Is that the case?

    If so, you can switch to our certificate by using this link:


    (The normal button won’t show as the certificate will be detected as valid)

    If your certificate is provided by the hosting company they can fix it for you.

Viewing 5 replies - 1 through 5 (of 5 total)
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