Any idea what could I try to find a solution to this issue? See the attached screenshot: I had to blur the IPs, anyway the longer string is my PC's local IP address, the shorter one is the customer's public IP. I tried checking the network traffic with Wireshark: I see the packages going through and answers coming back, thought the packets I see passing are far less than they are if I successfully connect to another HTTPS website. RDESKTOP AUTOSELECTED KEYBOARD MAP EN US ERROR UNABLE TO CONNECT PCStill, from any browser of any PC in my LAN I can't open that URL. I also tried telnet 443 and that works as well: I get a blank page with the cursor blinking (I've tried using another random port and that gives me an error message, as it should). The tracert is successful, as the final hop shown in the output is the host I want to reach. So I asked for help to our Internet provider's customer service, and they asked me to do a tracert to our customer's IP. I thought it may be an issue with our firewall (though I checked its rules and it allows outbound TCP port 443 to anywhere), so I just connected a PC directly to the network connection of our provider, bypassing out firewall completely, and still it didn't work (everything else worked). Well, it works from any network I've tried (even from my smartphone), just not from my company's LAN. I should put in my browser and get a web page. To help me troubleshoot this issue, the network guy on the customer's site has configured their firewall so that a HTTPS connection to their public IP address is open to any IP. One of my customers of the company I work for has made a change to their Internet connection, and now we can't connect to them any more from our LAN.
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