SSL Error – Certificate Not Trusted

When you access a website through a secure connection, it is a common issue to get a warning (SSL error) that the certificate is not issued by a trusted authority.

The exact warning message you will get depending on your browser is:

  • Firefox 3 - "The certificate is not trusted because the issuer certificate is unknown. (Error code: sec_error_unknown_issuer)"
  • Internet Explorer 7 - "The security certificate presented by this website was not issued by a trusted certificate authority."
  • Google Chrome - "The site's security certificate is not trusted!"
  • Safari - "Authentication failed because the server certificate is not trusted."

If you get one of the above warnings, this means that your browser does not trust the SSL certificate because it is not signed by a company that the browser recognizes as trusted.

The two most common reasons for this warning are:

* The website is using a self-signed/free SSL certificate.
* The website is using a private SSL certificate but it is missing a CA (Certificate Authority) certificate.

The solution in the first case is to purchase a private SSL certificate which is issued for the specific domain by a trusted authority.

The solution in the second case is to have the SSL certificate reinstalled with the correct CA bundle. The CA bundle is provided by the SSL vendor and should be included in the private SSL package.

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  1. Reply August 21, 2015 / 13:23 Roderick KennedySiteGround Team

    Siteground's certificate is invalid. Chrome error on login:

    Your connection is not private

    Attackers might be trying to steal your information from (for example, passwords, messages or credit cards). NET::ERR_CERT_DATE_INVALID

    • Reply August 24, 2015 / 07:31 Ivan StefanovSiteGround Team

      There was a slight issue with the WildCard SSL certificate for *, which we managed to resolve in Saturday. If you however still experiencing any kind of issues with the SSL of your server, please open a ticket in your Help Desk and my colleagues from the support team will help you further.

      • Reply March 10, 2017 / 10:13 Nigel ThompsonSiteGround Team

        I have a message 'Cannot Verify Server Identity', for my email address ''.
        It says something about sgcpanel not being trusted.
        I've been trying to resolve this for two days!
        Can you help please
        Nigel Thompson

        • Reply March 10, 2017 / 12:47 Ivan AtanasovSiteGround Team

          There are no issues with the sgcpanel certificate at the moment. I believe that you are attempting an SSL connection using your domain as a hostname.

          To see the correct settings, please go to your cPanel -> Email Accounts -> More (next to the email account in question) -> Configure Email Client.

    • Reply February 10, 2016 / 16:20 KimberlySiteGround Team

      I'm having that same error! Ugh!

      • Reply February 11, 2016 / 15:58 Ivan YordanovSiteGround Team

        We would be happy to assist you with that - please open a support ticket describing the issue and our support team will fix it as soon as possible.

  2. Reply August 25, 2015 / 16:01 ABRSiteGround Team

    I get the invalid cert error when I try to connect to an Exchange Server, apparently hosted by you, from my iOS device. For now, my solution is to not connect...

    • Reply August 26, 2015 / 15:25 Ivan StefanovSiteGround Team

      You should verify the exact Secure SSL settings for your mail account from your cPanel -> Email Accounts -> More -> choose Configure Email Client from the drop down menu. If you experience any further issues with the connection to an Exchange Server, please submit a support ticket from your User area and we will be glad to assist you!

  3. Reply September 30, 2015 / 18:34 bobSiteGround Team

    some of my clients are getting this error when they visit the site Same as Roderick:

    Siteground's certificate is invalid. Chrome error on login:
    Your connection is not private
    Attackers might be trying to steal your information from (for example, passwords, messages or credit cards). NET::ERR_CERT_DATE_INVALID

    I put in a support ticket and was told everything is okay. this needs to be addressed. I can't have clients not believing in my ability because the site warns them that I cannot be trusted

    • Reply October 2, 2015 / 07:37 Ivan StefanovSiteGround Team

      Bob, I carefully checked the SSL certificate of your server and your ticket (1403217), which was submitted more than a month ago, and confirmed that the issue has already been fully resolved.

      You could verify that the certificate is fully trusted by visiting this link.

  4. Reply March 25, 2016 / 23:20 SteveSiteGround Team

    When I try to login to the SiteGround cPanel X via Firefox I get the following message.

    "The owner of has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website."

    • Reply March 28, 2016 / 07:04 Ivan StefanovSiteGround Team

      Steve, the issue is most probably caused by the hostname that you are opening through HTTPS. On our shared servers we're using a wildcard SSL certificate for * and that is why when you open you are redirected to The SSL certificate for your server is configured properly and you may verify it from here.

      However, if the hostname that you are accessing through HTTPS is, and not - the self-singed certificate warning will show up as is explained in this article.

  5. Reply June 24, 2016 / 20:59 Kate, author, poetSiteGround Team

    What is the point of using the free "Let's Encrypt" SSL (TSL) certificate if the different browsers don't recognize it as being issued by a trusted authority? If the nonprofit group Internet Security Research Group is behind the widespread use of this new certificate by making it free, I would want it to work seamlessly with my website, regardless of which browser someone might be using. I am having issues with some of my content being blocked by the browsers Chrome and Avast SafeZone after tech support added the code for Let's Encrypt to my .htaccess file. I haven't tested it yet on other browsers. What do I need to do to get the blocked content unblocked?

    • Reply June 29, 2016 / 13:14 Ivan StefanovSiteGround Team

      Kate, Let's Encrypt doesn't require anything to be included in your .htaccess and we've verified that Chrome browser consider let's encrypt as fully trusted authority. I'm positive that the issue you're experiencing is related to different component than "Let's Encrypt" SSL, but the best way to investigate the case further would be to submit a new support ticket.

      Thank you!

  6. Reply July 14, 2016 / 23:25 TonySiteGround Team

    There could be a change if something went wrong with the computer or device and led to this error. Nothing goes wrong with the server or SSL installation at all.

    Sometimes, incorrect set up date & time on your computer also cause this issue.

  7. Reply November 1, 2016 / 17:49 AmolSiteGround Team

    Using Chrome Beta on Windows 10. Yesterday started noticing the url icon switched to a solid green lock icon for https instead of white lock on green background as well as an 'i' in a circle for all non-https sites. I also noticed the bookmarks toolbar has my saved file folders as blacked out instead of manila colored and the spacing of all icons is slightly greater for bookmark bar and url. Possible reasons? Did the typical browser cleaning, anti-virus/malware check, and firewall investigation to no avail. Any suggestions?

    • Reply November 4, 2016 / 08:48 Ivan StefanovSiteGround Team

      Amol, most probably the reason is the Beta browser version and that's why the best course of action is to confirm with a different one that everything is working and is displayed as expected.

  8. Reply December 12, 2016 / 06:49 Margaret FSiteGround Team

    I am having the same issue as Roderick and none of the people I've chatted with had been able to help. I just signed on and this has happened countless times in the past two days. I will be submitting a ticket tomorrow morning but this change over to Siteground has given me way too many headaches...

    • Reply December 20, 2016 / 15:54 Ivan StefanovSiteGround Team

      Margaret, the best course of action is to submit a support ticket and we will do anything within our reach in our to assist you with this case.

  9. Reply January 20, 2017 / 16:28 Bruce BidwellSiteGround Team

    I am have the same not trusted issues . I get the 404 page telling me to go back to trusted area. I am trying to go to the admin area of wordpress, but it won't load.

    • Reply February 1, 2017 / 15:32 Ivan StefanovSiteGround Team

      Bruce, the best course of action would be to post a support ticket and my colleagues will be glad to review your website and fix the issue.

  10. Reply February 18, 2017 / 23:58 GeorgeSiteGround Team

    I am having the same not trusted issues .

    • Reply February 20, 2017 / 16:13 Ivan AtanasovSiteGround Team

      If none of the mentioned solutions is applicable in your case, you can consider creating a Support Ticket from your User Area -> Support explaining this issue in more details so that we investigate it for you.

  11. Reply March 6, 2017 / 16:55 ScottSiteGround Team

    Today we were suddenly unable to check email from our iPhone due to the SSL certificate becoming "not trusted". We haven't changed anything - it just stopped working. I also changed the iPhone settings to turn off "use SSL" and it still says the certificate is not trusted. Please advise what is going on. We didn't change anything and it just stopped working.

    • Reply March 7, 2017 / 14:26 Ivan AtanasovSiteGround Team

      It is likely that the outgoing/incoming servername used for the connection on your iPhone is not covered by the certificate. To investigate this issue, we will need a more detailed look at the situation.

      Please create a ticket from your SiteGround User Area -> Support.

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