SSL certificate

SSL working on desktop, but not on mobile (android) devices

If the SSL certificate on your site works fine on desktop but gives an error on mobile devices (specifically Android):  this certificate isn’t from a trusted authority, there is probably an issue with your SSL certificate chain.

To check this, run an SSL check here:

If one of the results is This server’s certificate chain is incomplete. Grade capped to B, this might be the issue. Contact your hosting provider to fix your certificate chain.


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  • Alex

    Hm, got this problem, too.

    The scan shows Grade A but the mobile says : no https. What can I do? What could it be?

    • Rogier Lankhorst

      Did you check for chain errors in the scan results?

  • Simple_User

    Hello, I have a similar problem. Real Simple SSL worked great in general. The only problem is when you visit the website through a mobile device without using WIFI, then you get the error “Webpage not available… ERR_SSL_PROTOCOL_ERROR”
    it only happens when you are NOT using the WIFI and are just using the mobile network internet connection. IT seems that is not redirecting in this case.
    Please help!!!

    • Mark Wolters


      often this is caused by a server configuration issue, did you do a scan of your certificate over at That might point to possible issues with the certificate which can lead to your issue.


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