@Allend,
Thanks for your attention.
The port 22222 is filtered and from
HERE, I understand that --
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Filtered means that a firewall, filter, or other network obstacle is blocking the port so that Nmap cannot tell whether it is open or closed.
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Note that the port 22222 would be on the Public IP (my dynamic dns would always resolve my hostname to current public IP,which I verified with a vpn connection). Since The Public IP is dished by the ISP, it's a dynamic ip. I have no control over whichever port they choose to open,close or put in stealth/filtered.
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Perhaps silly question, but is sshd running on the target PC?
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Yes, like I said before, within the intranet (LAN), I can ssh to my computers just fine.
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Perhaps try setting the router to pass port 22222 to the target PC and set sshd to listen on that port.
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Yes, this is also done, many times each on two different routers, using different non-standard ports. (check the screenshots on my earlier posts)
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Check that any firewall on the target PC is allowing the incoming connection. (Check 'dmesg' for records of blocked connections.)
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Target PC does not have any entry for a blocked connection, which makes me believe that it is getting blocked at the ISP. Also, as I understand, the error message should have said "connection refused", instead of "Network Unreachable" if it were blocked at my side. [Do correct me if I am wrong].
Right now, I am waiting for a static IP to be assigned from my ISP, after which I would request them to open a non-standard port for me. (Thanks to @michaelk for the suggestion)
Finally !!
.
