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Maybe it's a dumb question but I don't know how to solve this: we've got a web server with an SSL certificate for its domain. I can view this site, correctly from anywhere but when we are at the office, inside the intranet. When I connect a PC to their WiFi or wired network I get an invalid certificate error, but when I'm connected from outside world I see it perfectly. What do I need to configure/add to the network to make it use Internet and not the intranet to get to the domain? I would appreciate your suggestions. Thank you in advance.

Edit: I'm running an ownCloud instance on a webserver, and it has Let's Encrypt SSL certificate. When I point a browser from outside the intranet I see the https working perfecly. When I do it from a device inside the network, even though I use the domain name (just the same address I use from outside) I get a self-signed certificate notice. It doesn't matter what OS I'd use, but anyway I test it using my Linux laptop and another running Windows.

Damon Hill
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2 Answers2

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Your internal DNS will need to be able to resolve the URL as per the certificate. If your internal DNS is different or resolving to a host name internally, the certificate will come up as invalid.

If you can control your internal DNS for external resolution, set the IP address for the URL internally as the external IP address.

Hope this makes sense.

Tim Haintz
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If your External and Internal URLs are same, then there might be Firewall or Proxy is creating this "invalid certificate error".

Try to install your SSL Certificate in Firewall or Proxy if its required.

Jake Adley
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