I tried to use set up git and use it for github, then when I followed the help doc, but when I got to step 5 of the set up ssh keys section :Test everything out , When I used this command: ssh -T [email protected]
I got an error:
ssh: connect to host github.com port 22: No route to host
Then I used this command:
ssh -vT [email protected]
Here is what I got:
OpenSSH_5.8p1 Debian-7ubuntu1, OpenSSL 1.0.0e 6 Sep 2011
debug1: Reading configuration data /home/jacos/.ssh/config
debug1: Applying options for github.com
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to github.com [207.97.227.239] port 22.
debug1: connect to address 207.97.227.239 port 22: No route to host
ssh: connect to host github.com port 22: No route to host
I googled for a while and found I have to check if the iptables blocked the port.
So here is the result:
~$ sudo /sbin/iptables -L -n
[sudo] password for jacos:
Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:67
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:67
ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:53
ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:53
Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT all -- 0.0.0.0/0 10.42.43.0/24 state RELATED,ESTABLISHED
ACCEPT all -- 10.42.43.0/24 0.0.0.0/0
ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-port-unreachable
Chain OUTPUT (policy ACCEPT)
target prot opt source destination
And I tried the command suggested by Gilles:
tcptraceroute github.com 22
Here is what I got:
Selected device eth0, address 222.20.58.XX(sorry...I masked part of my ip), port 33281 for outgoing packets
Tracing the path to github.com (207.97.227.239) on TCP port 22 (ssh), 30 hops max
1 222.20.58.254 0.891 ms 0.850 ms 0.693 ms
2 zxq-xs-h3c7510e.hust.edu.cn (115.156.255.137) 1.253 ms 1.569 ms 2.837 ms
3 zxq-xs-rjs8606.hust.edu.cn (115.156.255.130) 0.729 ms 0.678 ms 0.629 ms
4 115.156.255.174 0.794 ms 6.279 ms 16.569 ms
5 * * *
6 * * *
7 * * *
8 * * *
9 * * *
10 * * *
11 * * *
12 * * *
13 * * *
14 * * *
15 * * *
16 * * *
17 * * *
18 * * *
19 * * *
20 * * *
21 * * *
22 * * *
23 * * *
24 * * *
25 * * *
26 * * *
27 * * *
28 * * *
29 * * *
30 * * *
Destination not reached
It seems that the route is stopped at 115.156.255.174, which I don't know where it is.
I can't figure out what it means. Does it block port 22?
By the way, I can access the Internet and visit github.com. And I am using Ubuntu 11.10.
Can anyone help with this? Thanks!