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I've setup an SSH server on my Ubuntu desktop at home using a dynamic DNS service (NOIP). I have a wi-fi-only Android tablet running Android version 4.4.2. On my tablet I can connect to other SSH servers, such as my college's server. However, I cannot directly connect from my tablet to my desktop; every attempt times out. But I am able to connect to my college's server and then SSH into my desktop from there. Is there something I've not set up correctly in my sshd_config file possibly? I'm able to ping the public IP. But I'm at a loss to explain this behavior. I've used both JuiceSSH and ConnectBot to no avail. Thanks!

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  • As per this -- On my tablet I can connect to other SSH servers, such as my college's server. However, I cannot directly connect from my tablet to my desktop; -- IMO, it should be migrated to Super User since I see no issue with Android itself.
    – Firelord ♦
    Commented May 11, 2015 at 5:19
  • You're right, Firelord. I figured out my issue and it wasn't Android related.
    – Robert
    Commented May 11, 2015 at 13:42
  • Can you post your solution and mark the question as answered? Just so others can see the question is resolved and also what the solution to the problem was :)
    – D. Gibbs
    Commented May 11, 2015 at 14:09
  • Yeah absolutely. The problem was that my router does not support connecting to forwarded ports on the WAN IP from inside the LAN. This explains why I was able to connect to my WAN IP from my college's server but was unable to connect when using the WAN IP on my local network. Answers came from this AskUbuntu post and this AskUbuntu post.
    – Robert
    Commented May 11, 2015 at 14:28

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Do you have port forwarding or access list set on your router/firewall allowing only SSH from particular IP's?

This could explain why it works from a known location.

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  • No, nothing is discriminating based on IPs.
    – Robert
    Commented May 11, 2015 at 1:06
  • I have a 7" tablet running 4.4.2 and installed JuiceSSH and connected to my Ubuntu 12.04lts successfully on the inside. Can you post your sshd_config file?
    – onthelake
    Commented May 11, 2015 at 2:51
  • Were you able to connect using a domain name, or using your Ubuntu machine's local IP address? I was just told that it may not be possible to connect using the domain name while I'm on the same local network as my Ubuntu machine, so I may have to run out and find another wifi network to test that theory
    – Robert
    Commented May 11, 2015 at 2:53
  • Also, iptables I/F/O Chain Accept
    – onthelake
    Commented May 11, 2015 at 3:00
  • I used inside IP address.
    – onthelake
    Commented May 11, 2015 at 3:03
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Figured it out. The problem was that my router does not support connecting to forwarded ports on the WAN IP from inside the LAN. This explains why I was able to connect to my WAN IP from my college's server but was unable to connect when using the WAN IP on my local network.

Answers came from this AskUbuntu post and this AskUbuntu post.

edit: Unable to accept answer "until tomorrow."

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  • Have you tried settings your noIP hostname as the router's hostname in your network settings?
    – m-p-3
    Commented May 14, 2015 at 16:14

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