connect to host localhost port 22: Connection refused

Question

While installing hadoop in my local machine , i got following error

ssh -vvv localhost 
OpenSSH_5.5p1, OpenSSL 1.0.0e-fips 6 Sep 2011 
debug1: Reading configuration data /etc/ssh/ssh_config    
debug1: Applying options for * 
debug2: ssh_connect: needpriv 0 
debug1: Connecting to localhost [127.0.0.1] port 22. 
debug1: connect to address 127.0.0.1 port 22: Connection refused 
ssh: connect to host localhost port 22: Connection refused

can some one help me to resolve this error , than changing port number

score 155 · Answer 1 · answered Mar 07 '14 at 16:15

155

If install Hadoop on Mac OSX, make sure turn on Remote Login under System Preferences then File Sharing. This worked on my machine.

Remote Login

answered Mar 07 '14 at 16:15

vladof81

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FYI, this worked for me to solve this error in genral (for future users) seemingly has nothing to do specifically with Hadoop. Thanks! – joedragons Aug 04 '15 at 17:42
Should be accepted as answer – Anonymous Duck Jul 02 '23 at 12:10

score 118 · Answer 2 · edited Mar 11 '18 at 00:25

118

Remove SSH with the following command:

sudo apt-get remove openssh-client openssh-server

Install SSH again with:

sudo apt-get install openssh-client openssh-server

It will solve your problem.

edited Mar 11 '18 at 00:25

Ronan Boiteau

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answered Aug 09 '14 at 16:58

Divyang Shah

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Even though the answer sounds weird it works perfect even on port 22. – user1613360 Oct 17 '14 at 11:25
Why would it be necessary to remove it? If it was there the problem wouldn't exist. – user207421 May 30 '16 at 03:31
2

I think the reason is its not properly installed before – Divyang Shah May 30 '16 at 05:47
Note that @Michael Z s answer below solves the problem by taking the second step only (i.e. install w/out uninstalling the whole thing; this adds features) – patrick Aug 18 '17 at 20:34
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@patrick the remove process is needed in case it's partially added or not in a consistent stage. – Divyang Shah Sep 06 '17 at 04:55
when I execute the first line, it show that openssh-server has not been installed. Maybe this is the reason of the problem. – Jason Zhou Feb 26 '18 at 04:05
yes @JasonZhou in that case you need to just install openssh-server. no, need to follow whole process – Divyang Shah Feb 28 '18 at 09:00
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Just wanted to say that on WSL this messes up your ssh and you can't install it anymore – Mike Oct 23 '20 at 18:49
@Mike what do you mean by WSL? – Divyang Shah Nov 13 '20 at 13:18
@DivyangShah Windows Subsystem for Linux – Mike Nov 13 '20 at 19:24
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This is ridiculous - after 4 hours, just needed reinstalled. I'll be writing up an article. – Leafyshark Dec 22 '20 at 12:05
@Leafyshark yes, you should write. it will be helpful for others – Divyang Shah Dec 23 '20 at 18:01

score 40 · Answer 3 · edited Mar 11 '18 at 00:24

40

Do you have sshd installed? You can verify that with:

which ssh
which sshd

For detailed information you can visit this link.

edited Mar 11 '18 at 00:24

Ronan Boiteau

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answered Jun 27 '13 at 06:27

Tariq

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i tried giving sudo apt-get install openssh-server command , it started to ask password for hduser , where i didnt create any password for the user, how i can know the default password – Surya Jun 27 '13 at 06:48
i tired which ssh , which sshd , this gives me the internal path '/usr/bin/ssh' , they are already installed in my machine – Surya Jun 27 '13 at 07:00
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ssh is the client and sshd is the server. To install `sshd` use `sudo apt-get install openssh-server`. When you created the user account for `hduser`, you must have created a password. Do not confuse that with the empty passphrase you might have set for passwordless ssh from the `hduser` account to itself on localhost. – arun Jan 18 '15 at 23:36

score 29 · Answer 4 · edited Mar 11 '18 at 00:23

29

Try installing whole SSH package pack:

sudo apt-get install ssh

I had ssh command on my Ubuntu but got the error as you have. After full installation all was resolved.

edited Mar 11 '18 at 00:23

Ronan Boiteau

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answered Apr 25 '15 at 17:17

Michael Z

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This solved it for me, was exactly my situation (I also already had sshd installed and running, out of the box). On Ubuntu 19.04. – Jonathan Hartley Jun 06 '19 at 19:52
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Worked in Ubuntu 20.04. Same situation. – arthropod Nov 04 '21 at 14:57
Thumbs up. Previously I installed `sudo apt-get install openssh-client` on Ubuntu 22.04 and it returned the error. Now with the full SSH package pack install, error gone. – bim Nov 07 '22 at 16:05

score 21 · Answer 5 · answered May 04 '20 at 09:07

21

I use a Mac, this worked for me:

Open System Preferences, then search for 'sharing'.

Choose Remote Login, make sure it is on and remember to add required users.

Got it from here

answered May 04 '20 at 09:07

Dami

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I was having the problem while starting the hadoop, I fixed using this solution. – Arjun Gautam Oct 20 '21 at 10:40

score 20 · Answer 6 · edited Aug 25 '22 at 01:54

20

I did all the suggestion above and it did not work. Then I restart the ssh service and it works. This is what I do:

service sshd restart

Then I redo

ssh localhost

Now I can connect to my localhost. Hope it helps

edited Aug 25 '22 at 01:54

rokejulianlockhart

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answered Jun 08 '16 at 22:24

Arwan Khoiruddin

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`ssh: connect to host localhost port 22: Connection refused` – bim Nov 07 '22 at 15:59

score 13 · Answer 7 · edited Mar 11 '18 at 00:24

13

Check if this port is open. Maybe your SSH demon is not running. See if sshd is running. If not, then start it.

edited Mar 11 '18 at 00:24

Ronan Boiteau

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answered Jun 27 '13 at 06:25

abhinav

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i tried giving sudo apt-get install openssh-server command , it started to ask password for hduser , where i didnt create any password for the user, how i can know the default password for hduser – Surya Jun 27 '13 at 06:48
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No it is asking the password for root/ sudo user of linux system where you are installing. – abhinav Jun 27 '13 at 06:58
[root@localhost .ssh]# which ssh /usr/bin/ssh [root@localhost .ssh]# which sshd /usr/sbin/sshd , ssh is already installed in my machine – Surya Jun 27 '13 at 07:01
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then run the sshd demon /bin/etc/init.d sshd start – abhinav Jun 27 '13 at 07:03
sshd re-exec requires execution with an absolute path , this is message from the path – Surya Jun 27 '13 at 07:11
any support how to make this up – Surya Jun 27 '13 at 09:25

score 13 · Answer 8 · answered Apr 01 '18 at 12:00

13

I used:

sudo service ssh start

Then:

ssh localhost

answered Apr 01 '18 at 12:00

Linh

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score 8 · Answer 9 · edited May 25 '19 at 10:44

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If you restart service then it will work

$ service sshd restart

then check

$ ssh localhost

It will work

edited May 25 '19 at 10:44

Boiethios

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answered Oct 19 '16 at 10:49

Rushikesh

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score 7 · Answer 10 · edited Jan 19 '14 at 19:53

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Make sure that /etc/hosts.allow contains:

ssh:ALL:allow
sshd:ALL:allow

OR

ssh:localhost:allow
sshd:localhost:allow

OR - some other variant

ssh:{host1,host2,host3...}:allow
sshd{host1,host2,host3...}:allow

INSURE that the first line in the file DOES NOT begin with ALL:ALL:DENY

NOTHING will be able to communicate with the host... on any port.

edited Jan 19 '14 at 19:53

j0k

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answered Oct 04 '13 at 18:30

Larry Helms

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Perfect answer! – Kanuj Bhatnagar Sep 20 '16 at 03:16

score 4 · Answer 11 · answered May 30 '16 at 02:52

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For my case(ubuntu 14.04, fresh installed), I just run the following command and it works!

sudo apt-get install ssh

answered May 30 '16 at 02:52

Shiqing Fan

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score 4 · Answer 12 · answered May 31 '17 at 10:23

For what its worth I got the following error trying to ssh into my local machine, running Ubuntu 16.04 Xenial, from a vm.

 ssh: connect to host 192.168.144.18 port 22: Connection refused

It got immediately fixed with:

sudo apt-get install ssh

Take note, Before fix: 'which sshd' returned nothing and 'which ssh' returned

/usr/bin/ssh

And After the fix: 'which sshd' returned

/usr/sbin/sshd

score 3 · Answer 13 · answered Jun 23 '16 at 10:19

3

It might be caused by some of the following:

SSH Server is not installed (only SSH Client), try: apt-get install ssh openssh-client openssh-server
Connection is blocked by iptables (Firewall), try: ufw allow ssh

answered Jun 23 '16 at 10:19

damian1baran

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by default ssh is blocked on the firewall, even when installing with openssh enabled – DoctorPangloss Jul 02 '20 at 23:58

score 3 · Answer 14 · answered Mar 03 '17 at 16:16

3

On mac go to system settings->network->sharing and allow remote login.

try ssh localhost

You should be good.

answered Mar 03 '17 at 16:16

user2498105

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score 3 · Answer 15 · answered Feb 21 '19 at 17:48

What worked for me is:

sudo mkdir /var/run/sshd
sudo apt-get install --reinstall openssh-server

I tried all the above mentioned solutions but somehow this directory /var/run/sshd was still missing for me. I have Ubuntu 16.04.4 LTS. Hope my answer helps if someone has the same issue. ubuntu ssh xenial

score 3 · Answer 16 · answered Jul 30 '20 at 01:04

3

Before installing/reinstalling anything check the status of sshd . . .

sudo systemctl status sshd

You should see something like . . .

● sshd.service - OpenSSH server daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; disabled; vendor prese>
   Active: inactive (dead)
     Docs: man:sshd(8)
           man:sshd_config(5)

Just enable and start sshd

sudo systemctl enable sshd
sudo systemctl start sshd

answered Jul 30 '20 at 01:04

0p3r4t0r

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in ubuntu: this will work: systemctl enable ssh.service – Krishna Kumar Singh Dec 22 '20 at 08:11

score 2 · Answer 17 · answered Sep 25 '16 at 17:04

2

Actually i solved this, I just installed shh daemon.

in terminal :

sudo apt-get install openssh-server

answered Sep 25 '16 at 17:04

User Learning

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Kwaku Sarpong Manu · Answer 18 · 2018-03-07T21:39:31.073

If you're certain that you have installed ssh, then it's possible that ssh and/or sshd has been terminated or the server service hasn't been started. To check whether these processes are running use:

//this tells you whether your ssh instance is active/inactive
sudo service ssh status

OR

//this list all running processes whose names contain the string "ssh"
sudo ps -A | grep ssh

It's likely that ssh would be active and running but sshd would not. To enable them:

sudo service ssh start

NB; - some systems have a restart option but mine didn't

score 2 · Answer 19 · answered Jun 02 '20 at 09:33

try sudo vi /etc/ssh/sshd_config

in first few lies you'll find

Package generated configuration file

See the sshd_config(5) manpage for details

What ports, IPs and protocols we listen for

Port xxxxx

change Port xxxxx to "Port 22" and exit vi by saving changes.

restart ssh sudo service ssh restart

score 1 · Accepted Answer · edited Jan 19 '14 at 19:54

1

My port number is different. i tried using

ssh localhost -p 8088

this worked for me

edited Jan 19 '14 at 19:54

j0k

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answered Jun 27 '13 at 09:51

Surya

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score 1 · Answer 21 · edited Jul 14 '15 at 18:16

1

If you still face problems, try the following:

sudo ufw enable    
sudo apt-get install openssh-server

This might work too.

edited Jul 14 '15 at 18:16

OhBeWise

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answered Jul 14 '15 at 17:52

Dinesh

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Sanyog Tiwari · Answer 22 · 2017-01-14T05:00:36.697

1

A way to do is to go to terminal

$ sudo gedit /etc/hosts

***enter your ip address ipaddress of your pc  localhost 
    ipaddress of your pc  localhost(Edit your pc name with localhost) **

and again restart your ssh service using:

$ service ssh restart

Problem will be resolve. Thanks

edited Jan 14 '17 at 05:00

answered Jan 11 '17 at 14:01

Sanyog Tiwari

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score 1 · Answer 23 · answered Nov 09 '17 at 18:33

1

if you are using centOS or Red Hat, you should first update SElinux. Execute the following statement

ausearch -c 'sshd' --raw | audit2allow -M my-sshd

then you need to execute

semodule -i my-sshd.pp

good luck

answered Nov 09 '17 at 18:33

Berk CELEBI

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score 0 · Answer 24 · answered Apr 28 '16 at 09:43

You may should edit your /etc/hosts. For example if my hostname is ub0, but the hostname in /etc/hosts is localhost, it may occur

connect to host ub0 port 22: Connection refused

Because the hostname in /etc/hosts is localhost not ub0.

So, you should be careful the hostname when building up distributed clusters.

score 0 · Answer 25 · edited Dec 16 '18 at 23:47

0

For Linux:

Remove SSH with the following command:

sudo apt-get remove openssh-client openssh-server

Install SSH again with:

sudo apt-get install openssh-client openssh-server

edited Dec 16 '18 at 23:47

finefoot

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answered Dec 16 '18 at 22:11

Nehal Pawar

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score 0 · Answer 26 · answered Jan 16 '19 at 16:49

0

you need to check the configuration in sshd_config ListenAddress 0.0.0.0 update this and restart the sshd service that will resolve the issue.

answered Jan 16 '19 at 16:49

Rupeshrams

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score 0 · Answer 27 · answered Feb 27 '19 at 05:51

if you are able to ping and not able to ssh, then it is a firewall. The firewall on 18.4 (not sure about other versions) in on by default and only allow port 8080.

Here how you fix it

https://linuxconfig.org/how-to-enable-disable-firewall-on-ubuntu-18-04-bionic-beaver-linux

score 0 · Answer 28 · answered May 13 '20 at 11:15

0

Check file /etc/ssh/sshd_config for Port number. Make sure it is 22.

answered May 13 '20 at 11:15

hiruna72

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score 0 · Answer 29 · answered Jan 13 '23 at 11:59

0

What worked for me was modifying the ssh config file to the following:

Host * AddKeysToAgent yes UseKeychain yes IdentityFile ~/.ssh/id_rsa

answered Jan 13 '23 at 11:59

Mariusz Szymoniak

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score 0 · Answer 30 · answered Aug 22 '23 at 21:43

0

On WSL supported ubuntu I ran

service ssh start

Then

ssh localhost

It worked

answered Aug 22 '23 at 21:43

Eric Atinga

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score -1 · Answer 31 · answered Nov 26 '21 at 10:21

-1

if youre apache server is not running your local host wont run check that out there are some articles if you dont get it i will leave a link here ;)

check this

I had same error got it done rn

answered Nov 26 '21 at 10:21

peqhv2

1

While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - [From Review](/review/late-answers/30439479) – Emi OB Nov 29 '21 at 13:08

connect to host localhost port 22: Connection refused

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