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I can login to a root shell on my machine (yes or no, or I don’t know):Yes
One of our user is having an issue access this website using Google Chrome - https://www.psasltd.co.uk/
Above website only allow work on Chrome or Firefox. Our end users only have Chrome wb browser but when we trying to access it, this website is Secure but it’s asking for certificate invalid message.
Can someone help to see how to resolve this issue ?
This is the certificate i can see outside on Citrix environment but not within the Citrix environment so i am guessing i have to install it but dont know where to get this cert.
The website only works on Chrome (and Firefox). And your users have Chrome. I fail to see the problem?
Could you make a screenshot of the problem? I'm also failing to understand this. It's giving an error, but also says the website is secure? A secure website with an error?
From your first post I deduce Napthens is your employer. It seems your companies proxy does a "Man in the Middle", so it can screen all outgoing connections, for example, for virusses or other bad stuff. It could be there's an issue with the acceptance of the companies own certificate, but that's not something related to Let's Encrypt.
The user you've mentioned, is that an employee too?
Also, you haven't addressed my trouble understanding your request.