We are using a hosted webserver (by all-inkl) with wordpress, now one of our cusomers sent a screenshot of this error message, but on all our PCs it works perfectly fine, with the same browsers, he was using IE 11 and Google Chrome V 74.0.3729.169
My domain is: https://www.contakt-edv.com
My hosting provider, if applicable, is: all-inkl
I can login to a root shell on my machine (yes or no, or I don’t know): no
I’m using a control panel to manage my site (no, or provide the name and version of the control panel): no
I don't see a problem ( https://check-your-website.server-daten.de/?q=contakt-edv.com ):
The domain has a very good Grade B, so both connections (non-www + www) are secure, there are correct redirects, no http result.
The certificate is ok:
expires in 31 days contakt-edv.com, www.contakt-edv.com - 2 entries
and the chain is correct:
2 CN=Let's Encrypt Authority X3, O=Let's Encrypt, C=US
And there are no mixed content errors ( https://check-your-website.server-daten.de/?q=contakt-edv.com#html-content ). There are some Subresource Integrity definitions possible, but that's not a problem that would create a client message.
Looks like this customer uses a firewall or Anti-virus software with a SSL inspection. So that software creates an own certificate and is a Man in the middle.
But that's a problem of that customer, not of your website.
Can you share the screenshot? With the certificate informations?
There it should be visible if it is a Anti-Virus-Software certificate.
Thank you for the reply, i will ask our customer to send us a screenshot.
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