无法使用 SSH 登录到本地树莓派

Question

I've just set up Raspberry Pi and I am trying to login using SSH, but it fails with Connection timed out .

$ ssh -v pi@192.168.1.20
OpenSSH_6.7p1, OpenSSL 1.0.1j 15 Oct 2014
debug1: Reading configuration data /cygdrive/c/Users/ironsand/.ssh/config
debug1: Connecting to 192.168.1.20 [192.168.1.20] port 22.
debug1: connect to address 192.168.1.20 port 22: Connection timed out
ssh: connect to host 192.168.1.20 port 22: Connection timed out 

Even $ ping 192.168.1.20 also fails with Destination Host Unreachable and ping from Raspberry Pi to Windows also fails.

From Raspberry I can connect internet.

Bad thing is that I don't have the right to access WiFi router configuration. I'll ask share house manager, but probably I can't get the information of it.

Is there something I can do to fix the problem except for Router configuration?

This is ifconfig result.

Answer 1

My windows-computer had (without me noticing) changed the network-settings thinking it wasn't in a safe/private network. Going to networks and changing this followed by the following on the raspberry pi did it for me:

sudo rm /etc/ssh/ssh_host_* && sudo dpkg-reconfigure openssh-server

Answer 2

Few steps which might help narrowing the issue down:
1. try ssh 127.0.0.1 from raspberry pi itself - if it does not work it is probably some SSH issue on rpi (maybe it is disabled in raspi config - in the past it was disabled by default?)
2. try ssh 192.168.1.20 from the rpi itself
3. try connecting the RPI via the ethernet cable (not wifi)
4. try changing the IP of RPI - sometimes it helps
5. sometimes the power managment turns the wifi off - try running sudo /sbin/ifup --force wlan0 periodically

Answer 3

If you can't ping in either direction, even on the same subnet, then it sounds like your router is interfering, eg the "guest network" mode of many routers that isolate each computer on the LAN from one another. There may be nothing you can do short of installing another router downstream from the main one, and connecting both the Pi and the peer computer to that.

Answer 4

我遇到了同样的问题，结果我在路由器上启用了 AP 隔离，我禁用了它并且工作正常