this post was submitted on 08 Jul 2023
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Deep packet inspection is unlikely the culprit in my experience. SSH and SFTP use port 22 by default which is probably blocked. I log in to my work VPN through common ports 80 and 443 on public WiFi.
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.