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this post was submitted on 08 Jul 2023
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Actually, you're mistaken because I've set SSH and SFTP to use the port for IMAPS which is 993. I know that Dunkin Donuts, for example, offers guest WiFi. They have port 993 open because I can send and receive email from my phone. My email provider is Hostinger for reference. However, when I try to SSH into my server over the 993 port it fails when it should not. I have verified that 993 is not firewalled and that the SSH daemon is listening for connections on port 993. What else could it be other than a firewall analyzing the TCP handshake and seeing that it is not email, http, or https traffic? If I am wrong please educate me.
DD might be using something like that. I have heard they block TOR as well. I have used a VPN with ports 80 and 443 on their WiFi years ago.
Just in case I am wrong, the next time I go to Dunkin', I am going to see if I can use OpenVPN on port 80.