Insecure connection warnings while domain validates

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1

For our websites we use Let’s Encrypt to generate the SSL certs. One of our clients however has issues when he visits websites secured with a Let’s Encrypt SSL certificate. We cannot reproduce the issue, and when we validate the installation of the certificate using NoPadlock, all seems fine (Report here https://www.whynopadlock.com/results/45c5ece0-33a4-4514-825d-7a6df5739a50).

Our guess is that the client is using a Citrix(-like) environment in his office and it could be an internal firewall issue. Has anyone experienced a similar issue? We want to help the client and his system admin to figure out the source of the issue, but I haven’t been able to find anything related sofar.

My domain is:


The client sees an Insecure connection warning in Chrome

My web server is (include version):

The operating system my web server runs on is (include version): CentOs 7 with Plesk Onyx

My hosting provider, if applicable, is:

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): Yes

2

Hi @sanderdewijs,

Can the client provide a screenshot of the error they are seeing?

Usually when there is a middlebox/internal firewall meddling with the HTTPS connection you can examine the certificate details in the browser and this will often show a non-LE certificate that doesn't match the server certificate.

3

Hi @sanderdewijs

additional:

The client should use CTRL + Shift + I to open his Chrome console.

There should be some mixed content warnings with links reported.

And the Security Tab shows the details of the certificate.

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