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I am using ubuntu 20.04. ssh was working until I rebooted my computer. Since then I am not able to connect using ssh anymore.

"ssh exemple.com" surprisingly works. but "ssh 8.8.8.8", or "ssh google.com" outputs "Network is unreachable" and telnet google.com 22 gives "Network is unreachable" although I can navigate on my browser.

/etc/ssh/ssh_config contains "Port 22"

I already tried all approaches I could found on the internet. My guess is that ssh request is blocked before reaching the network, but I don't know how to address this problem.

Thanks

Edit : ssh [email protected] -vvv would ask for password, but now shows:

OpenSSH_8.2p1 Ubuntu-4ubuntu0.2, OpenSSL 1.1.1f  31 Mar 2020
debug1: Reading configuration data /home/antoine/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug3: /etc/ssh/ssh_config line 19: Including file /etc/ssh/ssh_config.d/ssh_ant.conf depth 0
debug1: Reading configuration data /etc/ssh/ssh_config.d/ssh_ant.conf
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug2: resolve_canonicalize: hostname 18.198.187.192 is address
debug2: ssh_connect_direct
debug1: Connecting to 18.198.187.192 [18.198.187.192] port 22.
debug1: connect to address 18.198.187.192 port 22: Connection timed out
ssh: connect to host 18.198.187.192 port 22: Connection timed out
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    I don't think Google is running a public facing SSH server on either of those addresses - so "network unreachable" should be expected as you're being dropped by a firewall. You have to test it with a machine you can actually login to.
    – Panki
    Jun 23, 2021 at 14:38
  • @Panki, utter silence or "connection refused" would make sense, "network unreachable" does not and is not to be expected. Just test it. Jun 23, 2021 at 14:53
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    @EduardoTrápani I just did with ssh google.com and I got network unreachable. I think it is difficult for a program to distinguish the exact reason why a connection attempt failed
    – Panki
    Jun 23, 2021 at 15:01
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    18.198.187.192 looks to be an AWS instance, I have to ask but is this your instance; are you able to verify your instance's IP address hasn't changed?
    – Thegs
    Jun 23, 2021 at 15:17
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    I’m voting to close this question because in the comments it is stated that the host is actually NOT reachable, and that was a fact about it. Leaving it open will only waste everybody's time. Jun 23, 2021 at 15:36

1 Answer 1

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@EduardoTrápani Figured out that this was likely a network issue and not an ssh issue as "ping" can not access requested ip addresses either

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    @roaima an answer according to EduardoTrápani 's suggestion Jun 23, 2021 at 15:39
  • Same for me, I was in a guest network and apparently some ports where blocked
    – CoderPi
    Nov 13, 2021 at 13:57

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