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I'm trying to connect to a Docker Playground instance from a SSH session initiated in CMD from my Windows 10 computer with the following command:

ssh -v ip172-18-0-18-cbepm33cukq00090gvu0@direct.labs.play-with-docker.com

Here is the SSH output:

OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
debug1: Connecting to direct.labs.play-with-docker.com [40.76.55.146] port 22.
debug1: Connection established.
debug1: identity file C:\\Users\\Marciano/.ssh/id_rsa type 0
debug1: identity file C:\\Users\\Marciano/.ssh/id_rsa-cert type -1
debug1: identity file C:\\Users\\Marciano/.ssh/id_dsa type -1
debug1: identity file C:\\Users\\Marciano/.ssh/id_dsa-cert type -1
debug1: identity file C:\\Users\\Marciano/.ssh/id_ecdsa type -1
debug1: identity file C:\\Users\\Marciano/.ssh/id_ecdsa-cert type -1
debug1: identity file C:\\Users\\Marciano/.ssh/id_ed25519 type 3
debug1: identity file C:\\Users\\Marciano/.ssh/id_ed25519-cert type -1
debug1: identity file C:\\Users\\Marciano/.ssh/id_xmss type -1
debug1: identity file C:\\Users\\Marciano/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_for_Windows_8.1
debug1: Remote protocol version 2.0, remote software version Go
debug1: no match: Go
debug1: Authenticating to direct.labs.play-with-docker.com:22 as 'ip172-18-0-18-cbepm33cukq00090gvu0'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: [email protected]
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: aes128-ctr MAC: [email protected] compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: [email protected] compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ssh-rsa SHA256:UyqFRi42lglohSOPKn6Hh9M83Y5Ic9IQn1PTHYqOjEA
debug1: Host 'direct.labs.play-with-docker.com' is known and matches the RSA host key.
debug1: Found key in C:\\Users\\Marciano/.ssh/known_hosts:19
debug1: rekey out after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey in after 4294967296 blocks
debug1: Will attempt key: C:\\Users\\Marciano/.ssh/id_ed25519 ED25519 SHA256:/p+cVcQBROp4X3eq1wi10tfgBSVUmKDaV2/hpxNTzM0 agent
debug1: Will attempt key: C:\\Users\\Marciano/.ssh/id_rsa RSA SHA256:BZFw2ybMWiH6PSOug+zBT90LhgwoxDMR0Ci7wAeJs/I
debug1: Will attempt key: C:\\Users\\Marciano/.ssh/id_dsa
debug1: Will attempt key: C:\\Users\\Marciano/.ssh/id_ecdsa
debug1: Will attempt key: C:\\Users\\Marciano/.ssh/id_xmss
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering public key: C:\\Users\\Marciano/.ssh/id_ed25519 ED25519 SHA256:/p+cVcQBROp4X3eq1wi10tfgBSVUmKDaV2/hpxNTzM0 agent
debug1: Server accepts key: C:\\Users\\Marciano/.ssh/id_ed25519 ED25519 SHA256:/p+cVcQBROp4X3eq1wi10tfgBSVUmKDaV2/hpxNTzM0 agent
debug1: Authentication succeeded (publickey).
Authenticated to direct.labs.play-with-docker.com ([40.76.55.146]:22).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: pledge: network
debug1: ENABLE_VIRTUAL_TERMINAL_INPUT is supported. Reading the VTSequence from console
debug1: ENABLE_VIRTUAL_TERMINAL_PROCESSING is supported. Console supports the ansi parsing
Connecting to 52.188.151.184:8022
debug1: channel 0: free: client-session, nchannels 1
Connection to direct.labs.play-with-docker.com closed.
Transferred: sent 2212, received 1436 bytes, in 1.1 seconds
Bytes per second: sent 1985.7, received 1289.1
debug1: Exit status -1

The logs show that after successful authentication the connection is immediately closed and the process exits with -1 status.

I also tried connecting with a PUTTY client and a custom .pkk file created by me with puttygen.exe as suggested in connect to a play-with-docker instance via putty however the SSH connection failed with Server refused to allocate pty status.

=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2022.07.24 17:13:47 =~=~=~=~=~=~=~=~=~=~=~=
Using username "ip172-18-0-18-cbepm33cukq00090gvu0".
Authenticating with public key "rsa-key-20220724"
Connecting to 52.188.151.184:8022
Server refused to allocate pty

Below is the more detailed output generated with -vvv ssh -vvv ip172-18-0-18-cbepm33cukq00090gvu0@direct.labs.play-with-docker.com

OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
debug3: Failed to open file:C:/Users/Marciano/.ssh/config error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_config error:2
debug2: resolving "direct.labs.play-with-docker.com" port 22
debug2: ssh_connect_direct
debug1: Connecting to direct.labs.play-with-docker.com [40.76.55.146] port 22.
debug1: Connection established.
debug1: identity file C:\\Users\\Marciano/.ssh/id_rsa type 0
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_rsa-cert error:2
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_rsa-cert.pub error:2
debug1: identity file C:\\Users\\Marciano/.ssh/id_rsa-cert type -1
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_dsa error:2
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_dsa.pub error:2
debug1: identity file C:\\Users\\Marciano/.ssh/id_dsa type -1
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_dsa-cert error:2
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_dsa-cert.pub error:2
debug1: identity file C:\\Users\\Marciano/.ssh/id_dsa-cert type -1
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_ecdsa error:2
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_ecdsa.pub error:2
debug1: identity file C:\\Users\\Marciano/.ssh/id_ecdsa type -1
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_ecdsa-cert error:2
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_ecdsa-cert.pub error:2
debug1: identity file C:\\Users\\Marciano/.ssh/id_ecdsa-cert type -1
debug1: identity file C:\\Users\\Marciano/.ssh/id_ed25519 type 3
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_ed25519-cert error:2
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_ed25519-cert.pub error:2
debug1: identity file C:\\Users\\Marciano/.ssh/id_ed25519-cert type -1
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_xmss error:2
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_xmss.pub error:2
debug1: identity file C:\\Users\\Marciano/.ssh/id_xmss type -1
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_xmss-cert error:2
debug3: Failed to open file:C:/Users/Marciano/.ssh/id_xmss-cert.pub error:2
debug1: identity file C:\\Users\\Marciano/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_for_Windows_8.1
debug1: Remote protocol version 2.0, remote software version Go
debug1: no match: Go
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to direct.labs.play-with-docker.com:22 as 'ip172-18-0-18-cbepm33cukq00090gvu0'
debug3: hostkeys_foreach: reading file "C:\\Users\\Marciano/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file C:\\Users\\Marciano/.ssh/known_hosts:19
debug3: load_hostkeys: loaded 1 keys from direct.labs.play-with-docker.com
debug3: Failed to open file:C:/Users/Marciano/.ssh/known_hosts2 error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],rsa-sha2-512,rsa-sha2-256,ssh-rsa,[email protected],[email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected]
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: [email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms: ssh-rsa
debug2: ciphers ctos: aes128-ctr,aes192-ctr,aes256-ctr,[email protected],arcfour256,arcfour128
debug2: ciphers stoc: aes128-ctr,aes192-ctr,aes256-ctr,[email protected],arcfour256,arcfour128
debug2: MACs ctos: [email protected],hmac-sha2-256,hmac-sha1,hmac-sha1-96
debug2: MACs stoc: [email protected],hmac-sha2-256,hmac-sha1,hmac-sha1-96
debug2: compression ctos: none
debug2: compression stoc: none
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: [email protected]
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: aes128-ctr MAC: [email protected] compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: [email protected] compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ssh-rsa SHA256:UyqFRi42lglohSOPKn6Hh9M83Y5Ic9IQn1PTHYqOjEA
debug3: hostkeys_foreach: reading file "C:\\Users\\Marciano/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file C:\\Users\\Marciano/.ssh/known_hosts:19
debug3: load_hostkeys: loaded 1 keys from direct.labs.play-with-docker.com
debug3: Failed to open file:C:/Users/Marciano/.ssh/known_hosts2 error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2
debug3: hostkeys_foreach: reading file "C:\\Users\\Marciano/.ssh/known_hosts"
debug3: record_hostkey: found key type RSA in file C:\\Users\\Marciano/.ssh/known_hosts:19
debug3: load_hostkeys: loaded 1 keys from 40.76.55.146
debug3: Failed to open file:C:/Users/Marciano/.ssh/known_hosts2 error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts error:2
debug3: Failed to open file:C:/ProgramData/ssh/ssh_known_hosts2 error:2
debug1: Host 'direct.labs.play-with-docker.com' is known and matches the RSA host key.
debug1: Found key in C:\\Users\\Marciano/.ssh/known_hosts:19
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 4294967296 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 4294967296 blocks
debug1: Will attempt key: C:\\Users\\Marciano/.ssh/id_ed25519 ED25519 SHA256:/p+cVcQBROp4X3eq1wi10tfgBSVUmKDaV2/hpxNTzM0 agent
debug1: Will attempt key: C:\\Users\\Marciano/.ssh/id_rsa RSA SHA256:BZFw2ybMWiH6PSOug+zBT90LhgwoxDMR0Ci7wAeJs/I
debug1: Will attempt key: C:\\Users\\Marciano/.ssh/id_dsa
debug1: Will attempt key: C:\\Users\\Marciano/.ssh/id_ecdsa
debug1: Will attempt key: C:\\Users\\Marciano/.ssh/id_xmss
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: C:\\Users\\Marciano/.ssh/id_ed25519 ED25519 SHA256:/p+cVcQBROp4X3eq1wi10tfgBSVUmKDaV2/hpxNTzM0 agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: C:\\Users\\Marciano/.ssh/id_ed25519 ED25519 SHA256:/p+cVcQBROp4X3eq1wi10tfgBSVUmKDaV2/hpxNTzM0 agent
debug3: sign_and_send_pubkey: ED25519 SHA256:/p+cVcQBROp4X3eq1wi10tfgBSVUmKDaV2/hpxNTzM0
debug3: sign_and_send_pubkey: signing using ssh-ed25519
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to direct.labs.play-with-docker.com ([40.76.55.146]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Entering interactive session.
debug1: pledge: network
debug1: ENABLE_VIRTUAL_TERMINAL_INPUT is supported. Reading the VTSequence from console
debug3: This windows OS supports conpty
debug1: ENABLE_VIRTUAL_TERMINAL_PROCESSING is supported. Console supports the ansi parsing
debug3: Successfully set console output code page from:65001 to 65001
debug3: Successfully set console input code page from:850 to 65001
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 3 setting TCP_NODELAY
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 2097152 rmax 32768
debug2: channel 0: rcvd ext data 35
Connecting to 52.188.151.184:8022
debug2: channel 0: written 35 to efd 6
debug3: receive packet: type 97
debug2: channel 0: rcvd close
debug2: channel 0: output open -> drain
debug2: channel 0: chan_shutdown_read (i0 o1 sock -1 wfd 4 efd 6 [write])
debug2: channel 0: input open -> closed
debug3: channel 0: will not send data after close
debug2: channel 0: obuf empty
debug2: channel 0: chan_shutdown_write (i3 o1 sock -1 wfd 5 efd 6 [write])
debug2: channel 0: output drain -> closed
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug3: Successfully set console output code page from 65001 to 65001
debug3: Successfully set console input code page from 65001 to 850
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug3: send packet: type 97
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
  #0 client-session (t4 r0 i3/0 o3/0 e[write]/0 fd -1/-1/6 sock -1 cc -1)

debug3: send packet: type 1
debug3: Successfully set console output code page from 65001 to 65001
debug3: Successfully set console input code page from 65001 to 850
Connection to direct.labs.play-with-docker.com closed.
Transferred: sent 2212, received 1436 bytes, in 1.1 seconds
Bytes per second: sent 1964.8, received 1275.5
debug1: Exit status -1

Thanks in advance for your help.

2 Answers 2

3

In my case, I was not able to connect.

  • The log indicates there is a mismatch in the public key algorithim
debug1: Offering public key: /c/Users/thiru/.ssh/id_rsa RSA SHA256:okCget2rl5sGoR024BKQkKZrv/7lwc/CZ98bDmECvF8
debug1: send_pubkey_test: no mutual signature algorithm
  • check the PWD (play with docker) instance algorithm, navigate to the Docker playground and check the .ssh algorithm type in my case it was ed25519 not rsa.

enter image description here

To fix this from Git bash terminal, I had to create a new ssh key with ed25519

$ ssh-keygen -t ed25519 -P "" -f ~/.ssh/id_ed25519

Generating public/private ed25519 key pair.
Your identification has been saved in /c/Users/thiru/.ssh/id_ed25519
Your public key has been saved in /c/Users/thiru/.ssh/id_ed25519.pub
  • Then I was able to connect to the PWD instance

enter image description here

  • complete Ssh client log
 ssh -v ip17212-***********@direct.labs.play-with-docker.com
OpenSSH_8.8p1, OpenSSL 1.1.1l  24 Aug 2021
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to direct.labs.play-with-docker.com [40.*.*.146] port 22.
debug1: Connection established.
...
debug1: Local version string SSH-2.0-OpenSSH_8.8
debug1: Remote protocol version 2.0, remote software version Go
debug1: compat_banner: no match: Go
debug1: Authenticating to direct.labs.play-with-docker.com:22 as 'ip172-****-*********'
debug1: load_hostkeys: fopen /c/Users/thiru/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: rsa-sha2-512
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: SSH2_MSG_KEX_ECDH_REPLY received
debug1: Server host key: ssh-rsa SHA256:vCb*******************
debug1: load_hostkeys: fopen /c/Users/thiru/.ssh/known_hosts2: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: Host 'direct.labs.play-with-docker.com' is known and matches the RSA host key.
debug1: Found key in /c/Users/thiru/.ssh/known_hosts:8
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey in after 134217728 blocks
debug1: Will attempt key: /c/Users/thiru/.ssh/id_rsa RSA SHA256:okCget2rl5sGoR024BKQkKZrv/7lwc/CZ98bDmECvF8
debug1: Will attempt key: /c/Users/thiru/.ssh/id_dsa
debug1: Will attempt key: /c/Users/thiru/.ssh/id_ecdsa
debug1: Will attempt key: /c/Users/thiru/.ssh/id_ecdsa_sk
debug1: Will attempt key: /c/Users/thiru/.ssh/id_ed25519
debug1: Will attempt key: /c/Users/thiru/.ssh/id_ed25519_sk
debug1: Will attempt key: /c/Users/thiru/.ssh/id_xmss
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /c/Users/thiru/.ssh/id_rsa RSA SHA256:okCget2rl5sGoR024BKQkKZrv/7lwc/CZ98bDmECvF8
debug1: send_pubkey_test: no mutual signature algorithm
debug1: Trying private key: /c/Users/thiru/.ssh/id_dsa
debug1: Trying private key: /c/Users/thiru/.ssh/id_ecdsa
debug1: Trying private key: /c/Users/thiru/.ssh/id_ecdsa_sk
debug1: Trying private key: /c/Users/thiru/.ssh/id_ed25519
debug1: Trying private key: /c/Users/thiru/.ssh/id_ed25519_sk
debug1: Trying private key: /c/Users/thiru/.ssh/id_xmss
debug1: No more authentication methods to try.
ip172-1*****2-cd5d********[email protected]: Permission denied (publickey).
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1 Comment

I don't quite understand how SSH works in this case. Why does locally generated key work, without copying the newly generated public key into the docker playground?
1

1.Firstly on the terminal on the docker playground run the following command:

cat ~/.ssh/id_rsa.pub

the result will be something like :

ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIB029t4sF6xjc8O9xV2 root@builsandbox

2.on your local linux open terminal / on windows open git bash from where you want to ssh.

3.Run the following command:

ssh-keygen -t ed25519 -P "" -f ~/.ssh/id_ed25519

in the result of first command if ed25519 is different then replace ed25519 with that name.

4.Run the following command with the ssh ip found on the docker playground webpage:

ssh -v ip172-18-0-98-***@direct.labs.play-with-docker.com

1 Comment

Wow, this worked. Thanks! I was able to connect to multiple instances too with this approach.

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