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CO-piBOT: return = 21

This code indicates the certificate found on the server has not been recognized by our test tool.
  • If this certificate has been delivered by TBS INTERNET, it has been wrongly installed. In most cases it comes from the certification chain that is not or wrongly displayed.
    See our installation instructions (in the delivery e-mail) and make sure the chain has been properly installed (voir Install a server certificate, file B for an Apache installation or for Microsoft Install intermediate certificates or root certificates manually).
  • This message can also be sparked off if you bought a certificate issued by a certification authority we do not trust and with we chose not to work.

Error messages that client browsers might display

It can produce the following error message:
  • Microsoft Internet Explorer

    There is a problem with this website's security certificate.

    The security certificate presented by this website was issued for a different website's address.

    Security certificate's problems may indicate an attempt to fool you or intercept any data you send to the server.

    We recommend that you close this webpage and do not continue to this website.

    Click here to close this webpage
    Continue to this website (not recommended)
    More informations

  • Google Chrome

    This is probably not the site you are looking for!

    You attempted to reach, but instead you actually reached a server identifying itself as * . This may be caused by a misconfiguration on the server or by something more serious. An attacker on your network could be trying to get you to visit a fake (and potentially harmful) version of You should not proceed, especially if you have never seen this warning before for this site.

  • Apple Safari, Apple Mail, Iphone, IPad, ...

    Safari can't verify the identity of the website <<>>

    The certificate for this website is invalid. You might be connecting to a website that is pretending to be <<>>, which could put your confidential information at risk. Would you like to connect to the website anyway?

  • Mozilla Firefox, Tunderbird, ...

    This Connection is Untrusted

    You have asked Firefox to connect securely to, but we can't confirm that your connection is secure.

    Normally, when you try to connect securely, sites will present trusted identification to prove that you are going to the right place. However, this site's identity can't be verified.
    What Should I Do?
    If you usually connect to this site without problems, this error could mean that someone is trying to impersonate the site, and you shouldn't continue.
    Get me out of here!

    Technical Details uses an invalid security certificate.
    The certificate is only valid for
    (Error code: ssl_error_bad_cert_domain)

    I Understand the Risks