Git Bash issue when 'Entering interactive session'. (Windows 10) - ssh

SSH used to work nicely with Git Bash before. Don't know what happened recently.
SSH version on CMD:
C:\Users\ my-user>ssh -V
OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
Debug/errors On CMD:
C:\Users\ my-user>ssh -V
OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
C:\Users\ my-user>ssh -v my-user1#server-url
OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
debug1: Connecting to server-url [public-ip] port 22.
debug1: Connection established.
debug1: identity file C:\\Users\\ my-user/.ssh/id_rsa type 0
debug1: identity file C:\\Users\\ my-user/.ssh/id_rsa-cert type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_dsa type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_dsa-cert type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_ecdsa type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_ecdsa-cert type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_ed25519 type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_ed25519-cert type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_xmss type -1
debug1: identity file C:\\Users\\ my-user/.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 OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7* compat 0x04000002
debug1: Authenticating to server-url:22 as 'my-user1'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ssh-ed25519
debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ssh-ed25519 SHA256:Mw4Mlvqk2MgCynA+8nTUrxDy8wxXONlTAVk2K/FgbcQ
debug1: Host 'server-url' is known and matches the ED25519 host key.
debug1: Found key in C:\\Users\\ my-user/.ssh/known_hosts:167
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: pubkey_prepare: ssh_get_authentication_socket: No such file or directory
debug1: Will attempt key: C:\\Users\\ my-user/.ssh/id_rsa RSA SHA256:OyvnNnesOb+dn3j9NWl9dkDu/Fi52CKlN9Vq8h9LzoA
debug1: Will attempt key: C:\\Users\\ my-user/.ssh/id_dsa
debug1: Will attempt key: C:\\Users\\ my-user/.ssh/id_ecdsa
debug1: Will attempt key: C:\\Users\\ my-user/.ssh/id_ed25519
debug1: Will attempt key: C:\\Users\\ my-user/.ssh/id_xmss
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug1: SSH2_MSG_SERVICE_ACCEPT received
Authorized uses only. All activity may be monitored and reported.
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic
debug1: Next authentication method: publickey
debug1: Offering public key: C:\\Users\\ my-user/.ssh/id_rsa RSA SHA256:OyvnNnesOb+dn3j9NWl9dkDu/Fi52CKlN9Vq8h9LzoA
debug1: Server accepts key: C:\\Users\\ my-user/.ssh/id_rsa RSA SHA256:OyvnNnesOb+dn3j9NWl9dkDu/Fi52CKlN9Vq8h9LzoA
debug1: Authentication succeeded (publickey).
Authenticated to server-url ([public-ip]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions#openssh.com
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
debug1: client_input_global_request: rtype hostkeys-00#openssh.com want_reply 0
Last login: Tue Jun 28 09:20:50 2022 from org-ip
Same SSH version on Git Bash:
my-user#my-server MINGW64 /
$ ssh -V
OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
Debug/errors On Git Bash:
my-user#my-server MINGW64 /
$ ssh -v my-user1#server-url
OpenSSH_for_Windows_8.1p1, LibreSSL 3.0.2
Pseudo-terminal will not be allocated because stdin is not a terminal.
debug1: Connecting to server-url [public-ip] port 22.
debug1: Connection established.
debug1: identity file C:\\Users\\ my-user/.ssh/id_rsa type 0
debug1: identity file C:\\Users\\ my-user/.ssh/id_rsa-cert type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_dsa type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_dsa-cert type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_ecdsa type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_ecdsa-cert type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_ed25519 type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_ed25519-cert type -1
debug1: identity file C:\\Users\\ my-user/.ssh/id_xmss type -1
debug1: identity file C:\\Users\\ my-user/.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 OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7* compat 0x04000002
debug1: Authenticating to server-url:22 as 'my-user1'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ssh-ed25519
debug1: kex: server->client cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: hmac-sha2-256 compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ssh-ed25519 SHA256:Mw4Mlvqk2MgCynA+8nTUrxDy8wxXONlTAVk2K/FgbcQ
debug1: Host 'server-url' is known and matches the ED25519 host key.
debug1: Found key in C:\\Users\\ my-user/.ssh/known_hosts:167
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: pubkey_prepare: ssh_get_authentication_socket: No such file or directory
debug1: Will attempt key: C:\\Users\\ my-user/.ssh/id_rsa RSA SHA256:OyvnNnesOb+dn3j9NWl9dkDu/Fi52CKlN9Vq8h9LzoA
debug1: Will attempt key: C:\\Users\\ my-user/.ssh/id_dsa
debug1: Will attempt key: C:\\Users\\ my-user/.ssh/id_ecdsa
debug1: Will attempt key: C:\\Users\\ my-user/.ssh/id_ed25519
debug1: Will attempt key: C:\\Users\\ my-user/.ssh/id_xmss
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug1: SSH2_MSG_SERVICE_ACCEPT received
Authorized uses only. All activity may be monitored and reported.
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic
debug1: Next authentication method: publickey
debug1: Offering public key: C:\\Users\\ my-user/.ssh/id_rsa RSA SHA256:OyvnNnesOb+dn3j9NWl9dkDu/Fi52CKlN9Vq8h9LzoA
debug1: Server accepts key: C:\\Users\\ my-user/.ssh/id_rsa RSA SHA256:OyvnNnesOb+dn3j9NWl9dkDu/Fi52CKlN9Vq8h9LzoA
debug1: Authentication succeeded (publickey).
Authenticated to server-url ([public-ip]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions#openssh.com
<gets stuck here>
Any help/leads is welcome
Note: Git Bash uses mintty terminal

found a workaround solution: SSH works if I select "Windows cmd" as terminal instead of "mintty" which is the default while installation

Related

ssh authentication failed bitbucket server

I am trying to connect to bitbucket server via ssh. And i get Host key verification failed.
I sued this guide https://support.atlassian.com/bitbucket-cloud/docs/set-up-an-ssh-key/ and added my public key to the server and every thing seems to be setup correctley.
I ran ssh -v git#bitbucket.corp.jyskebank.net and get this. Is there a way to fix it?
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to bitbucket.corp.jyskebank.net [10.16.207.13] port 22.
debug1: Connection established.
debug1: identity file /home/JB4555/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/JB4555/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/JB4555/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/JB4555/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/JB4555/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/JB4555/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/JB4555/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/JB4555/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH* compat 0x04000000
debug1: Authenticating to bitbucket.corp.jyskebank.net:22 as 'git'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305#openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305#openssh.com MAC: <implicit> compression: none
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:/pe/xQGds7FWBp5Oj1710EfF8g9EL+Uo+kVfqy3IEQA
debug1: Host 'bitbucket.corp.jyskebank.net' is known and matches the ECDSA host key.
debug1: Found key in /home/JB4555/.ssh/known_hosts:1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug1: Next authentication method: gssapi-with-mic
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/JB4555/.ssh/id_rsa
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Offering RSA public key: /home/JB4555/.ssh/id_rsa
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Trying private key: /home/JB4555/.ssh/id_dsa
debug1: Trying private key: /home/JB4555/.ssh/id_ecdsa
debug1: Trying private key: /home/JB4555/.ssh/id_ed25519
debug1: Next authentication method: password
Turned out there was no error. But the problem was that vscode cannot connect via ssh, when the key contains a passprahase

cant connect from VM1 to VM2

I have 2 virtual machines on my computer created with Vagrant.
on VM1 I create SSH key with ssh-keygen. Then copied id_rsa.pub into authorized_keys on VM2.
When I try to connect to VM2 using ssh 172.28.128.18, the connection is failed with following error
The authenticity of host '172.28.128.18 (172.28.128.18)' can't be established.
ECDSA key fingerprint is SHA256:YJ0CDFr9UcEBZkY1ajZRFg3Zx9uksZcv/i3fpC8gqdY.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '172.28.128.18' (ECDSA) to the list of known hosts.
vagrant#172.28.128.18: Permission denied (publickey).
With ssh -v vagrant#172.28.128.18 I have an other error:
OpenSSH_8.2p1 Ubuntu-4ubuntu0.3, OpenSSL 1.1.1f 31 Mar 2020
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to 172.28.128.18 [172.28.128.18] port 22.
debug1: Connection established.
debug1: identity file /home/vagrant/.ssh/id_rsa type 0
debug1: identity file /home/vagrant/.ssh/id_rsa-cert type -1
debug1: identity file /home/vagrant/.ssh/id_dsa type -1
debug1: identity file /home/vagrant/.ssh/id_dsa-cert type -1
debug1: identity file /home/vagrant/.ssh/id_ecdsa type -1
debug1: identity file /home/vagrant/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/vagrant/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/vagrant/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/vagrant/.ssh/id_ed25519 type -1
debug1: identity file /home/vagrant/.ssh/id_ed25519-cert type -1
debug1: identity file /home/vagrant/.ssh/id_ed25519_sk type -1
debug1: identity file /home/vagrant/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/vagrant/.ssh/id_xmss type -1
debug1: identity file /home/vagrant/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.3
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.2p1 Ubuntu-4ubuntu0.3
debug1: match: OpenSSH_8.2p1 Ubuntu-4ubuntu0.3 pat OpenSSH* compat 0x04000000
debug1: Authenticating to 172.28.128.18:22 as 'vagrant'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305#openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305#openssh.com MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:YJ0CDFr9UcEBZkY1ajZRFg3Zx9uksZcv/i3fpC8gqdY
debug1: Host '172.28.128.18' is known and matches the ECDSA host key.
debug1: Found key in /home/vagrant/.ssh/known_hosts:1
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: /home/vagrant/.ssh/id_rsa RSA SHA256:1cq8iCIBMZrwP6BVucSZx4Luk3LfTAf/XOfovgHiW/Y
debug1: Will attempt key: /home/vagrant/.ssh/id_dsa
debug1: Will attempt key: /home/vagrant/.ssh/id_ecdsa
debug1: Will attempt key: /home/vagrant/.ssh/id_ecdsa_sk
debug1: Will attempt key: /home/vagrant/.ssh/id_ed25519
debug1: Will attempt key: /home/vagrant/.ssh/id_ed25519_sk
debug1: Will attempt key: /home/vagrant/.ssh/id_xmss
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,sk-ssh-ed25519#openssh.com,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256
#openssh.com>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /home/vagrant/.ssh/id_rsa RSA SHA256:1cq8iCIBMZrwP6BVucSZx4Luk3LfTAf/XOfovgHiW/Y
debug1: Authentications that can continue: publickey
debug1: Trying private key: /home/vagrant/.ssh/id_dsa
debug1: Trying private key: /home/vagrant/.ssh/id_ecdsa
debug1: Trying private key: /home/vagrant/.ssh/id_ecdsa_sk
debug1: Trying private key: /home/vagrant/.ssh/id_ed25519
debug1: Trying private key: /home/vagrant/.ssh/id_ed25519_sk
debug1: Trying private key: /home/vagrant/.ssh/id_xmss
debug1: No more authentication methods to try.
vagrant#172.28.128.18: Permission denied (publickey).
What is the reason of failing connecting to VM2?
on VM2
sudo tail -f /var/log/auth.log
server sshd[2509]: Connection closed by authenticating user vagrant 172.28.128.12 port 56446 [preauth]
Same problem is, when I try to connect from VM2 to VM1.

SSH Key prompts password for "ssh -Tv git#gitlab.tubit.tu-berlin.de"

I am trying to connect to GitLab over SSH with ED25519 and followed this source: https://docs.gitlab.com/ee/ssh/ . When I test the connection and expect the welcome message, instead it does not work and still prompts for a password. I tried my user password, but it doesn't work and I am not sure which password is required at this point. Here's the output.
ssh -Tv git#gitlab.tubit.tu-berlin.de
OpenSSH_8.2p1 Ubuntu-4ubuntu0.1, OpenSSL 1.1.1f 31 Mar 2020
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to gitlab.tubit.tu-berlin.de [130.149.7.193] port 22.
debug1: Connection established.
debug1: identity file /home/christian/.ssh/id_rsa type -1
debug1: identity file /home/christian/.ssh/id_rsa-cert type -1
debug1: identity file /home/christian/.ssh/id_dsa type -1
debug1: identity file /home/christian/.ssh/id_dsa-cert type -1
debug1: identity file /home/christian/.ssh/id_ecdsa type -1
debug1: identity file /home/christian/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/christian/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/christian/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/christian/.ssh/id_ed25519 type 3
debug1: identity file /home/christian/.ssh/id_ed25519-cert type -1
debug1: identity file /home/christian/.ssh/id_ed25519_sk type -1
debug1: identity file /home/christian/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/christian/.ssh/id_xmss type -1
debug1: identity file /home/christian/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3
debug1: match: OpenSSH_5.3 pat OpenSSH_5* compat 0x0c000002
debug1: Authenticating to gitlab.tubit.tu-berlin.de:22 as 'git'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: diffie-hellman-group-exchange-sha256
debug1: kex: host key algorithm: ssh-rsa
debug1: kex: server->client cipher: aes128-ctr MAC: umac-64#openssh.com compression: none
debug1: kex: client->server cipher: aes128-ctr MAC: umac-64#openssh.com compression: none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(2048<3072<8192) sent
debug1: got SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: got SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: ssh-rsa SHA256:aA86J3auCo20sHneGIvwxk/uay4ynBNkWIgiio/qUUw
debug1: Host 'gitlab.tubit.tu-berlin.de' is known and matches the RSA host key.
debug1: Found key in /home/christian/.ssh/known_hosts:3
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: /home/christian/.ssh/id_ed25519 ED25519 SHA256:rFB2QOkPTiiqlMAN1V9RS9QVV2vrgxgRAa9wXm0RdJI agent
debug1: Will attempt key: /home/christian/.ssh/id_rsa
debug1: Will attempt key: /home/christian/.ssh/id_dsa
debug1: Will attempt key: /home/christian/.ssh/id_ecdsa
debug1: Will attempt key: /home/christian/.ssh/id_ecdsa_sk
debug1: Will attempt key: /home/christian/.ssh/id_ed25519_sk
debug1: Will attempt key: /home/christian/.ssh/id_xmss
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Offering public key: /home/christian/.ssh/id_ed25519 ED25519 SHA256:rFB2QOkPTiiqlMAN1V9RS9QVV2vrgxgRAa9wXm0RdJI agent
debug1: Authentications that can continue: publickey,keyboard-interactive
debug1: Trying private key: /home/christian/.ssh/id_rsa
debug1: Trying private key: /home/christian/.ssh/id_dsa
debug1: Trying private key: /home/christian/.ssh/id_ecdsa
debug1: Trying private key: /home/christian/.ssh/id_ecdsa_sk
debug1: Trying private key: /home/christian/.ssh/id_ed25519_sk
debug1: Trying private key: /home/christian/.ssh/id_xmss
debug1: Next authentication method: keyboard-interactive
Password:
debug1: Authentications that can continue: publickey,keyboard-interactive
Password:
debug1: Authentications that can continue: publickey,keyboard-interactive
Password:
debug1: Authentications that can continue: publickey,keyboard-interactive
debug1: No more authentication methods to try.
git#gitlab.tubit.tu-berlin.de: Permission denied (publickey,keyboard-interactive).
From the guide you mention, you need to double-check:
you have an OpenSSH 6.5 or newer
you have copied the public key to your GitLab User account Settings/SSH Keys
I would test it first with a private SSH key without any passsphrase.

Problem: Permission denied (publickey,gssapi-keyex,gssapi-with-mic)

I cannot connect to the server I get the following error message:
OpenSSH_7.6p1 Ubuntu-4ubuntu0.3, OpenSSL 1.0.2n 7 Dec 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to login-thinking.hpc.kuleuven.be [134.58.8.41] port 22.
debug1: Connection established.
debug1: identity file /home/emiellanckriet/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/emiellanckriet/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/emiellanckriet/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/emiellanckriet/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/emiellanckriet/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/emiellanckriet/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/emiellanckriet/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/emiellanckriet/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.3
debug1: Remote protocol version 2.0, remote software version sshr
debug1: no match: sshr
debug1: Authenticating to login-thinking.hpc.kuleuven.be:22 as 'vsc32452'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256#libssh.org
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305#openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305#openssh.com MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:CWFbFs7K9n0JM83sRWimMYY7Ie+f1QJmmvBUS1gVHig
debug1: Host 'login-thinking.hpc.kuleuven.be' is known and matches the ECDSA host key.
debug1: Found key in /home/emiellanckriet/.ssh/known_hosts:1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure. Minor code may provide more information
No Kerberos credentials available (default cache: FILE:/tmp/krb5cc_1000)
debug1: Unspecified GSS failure. Minor code may provide more information
No Kerberos credentials available (default cache: FILE:/tmp/krb5cc_1000)
debug1: Next authentication method: publickey
debug1: Offering public key: RSA SHA256:ebUgOZfhmGQlWbnTz1/IVgyPTlLBSSPN0lqyLpPxSSc /home/emiellanckriet/.ssh/id_rsa
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic
debug1: Trying private key: /home/emiellanckriet/.ssh/id_dsa
debug1: Trying private key: /home/emiellanckriet/.ssh/id_ecdsa
debug1: Trying private key: /home/emiellanckriet/.ssh/id_ed25519
debug1: No more authentication methods to try.
vsc32452#login-thinking.hpc.kuleuven.be: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
The public key needed is stored in ~/.ssh/id_rsa.pub, however the first debug message say that there is no such file or directory.
I am working on the Windows Subsystem for Linux.
Does someone know what the problem is?
Turns out there was not really a problem, I had uploaded my public key and apparently this still had to be processed on the server. Trying exactly the same the next morning worked for me.

install arch gitlab and can not git clone using ssh method

I followed, https://wiki.archlinux.org/index.php/GitLab#Configuration, and finally brought gitlab it up. But, I could not use ssh to clone the project.
$ ssh -T gitlab#192.168.48.3
Failed to get username: who='' is invalid
What is this message who='' and how to debug???
Using ssh -Tv, I got
$ ssh -T gitlab#192.168.48.3
Failed to get username: who='' is invalid
[alexlai#N2eMMc128G ~]$ ssh -Tv gitlab#192.168.48.3
OpenSSH_8.1p1, OpenSSL 1.1.1d 10 Sep 2019
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to 192.168.48.3 [192.168.48.3] port 22.
debug1: Connection established.
debug1: identity file /home/alexlai/.ssh/id_rsa type 0
debug1: identity file /home/alexlai/.ssh/id_rsa-cert type -1
debug1: identity file /home/alexlai/.ssh/id_dsa type -1
debug1: identity file /home/alexlai/.ssh/id_dsa-cert type -1
debug1: identity file /home/alexlai/.ssh/id_ecdsa type -1
debug1: identity file /home/alexlai/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/alexlai/.ssh/id_ed25519 type -1
debug1: identity file /home/alexlai/.ssh/id_ed25519-cert type -1
debug1: identity file /home/alexlai/.ssh/id_xmss type -1
debug1: identity file /home/alexlai/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_8.1
debug1: match: OpenSSH_8.1 pat OpenSSH* compat 0x04000000
debug1: Authenticating to 192.168.48.3:22 as 'gitlab'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305#openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305#openssh.com MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:TbXi96Gynm1xqcTglDvS4ajP7hPHMHf2hnOiJ3w5e74
debug1: Host '192.168.48.3' is known and matches the ECDSA host key.
debug1: Found key in /home/alexlai/.ssh/known_hosts:5
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: /home/alexlai/.ssh/id_rsa RSA SHA256:tdOYKwO8CDOzJeJo/6WYbtStpsMg8kuSGLCie5JOY1g
debug1: Will attempt key: /home/alexlai/.ssh/id_dsa
debug1: Will attempt key: /home/alexlai/.ssh/id_ecdsa
debug1: Will attempt key: /home/alexlai/.ssh/id_ed25519
debug1: Will attempt key: /home/alexlai/.ssh/id_xmss
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering public key: /home/alexlai/.ssh/id_rsa RSA SHA256:tdOYKwO8CDOzJeJo/6WYbtStpsMg8kuSGLCie5JOY1g
debug1: Server accepts key: /home/alexlai/.ssh/id_rsa RSA SHA256:tdOYKwO8CDOzJeJo/6WYbtStpsMg8kuSGLCie5JOY1g
debug1: Authentication succeeded (publickey).
Authenticated to 192.168.48.3 ([192.168.48.3]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions#openssh.com
debug1: Entering interactive session.
debug1: pledge: network
debug1: client_input_global_request: rtype hostkeys-00#openssh.com want_reply 0
debug1: Remote: /var/lib/gitlab/.ssh/authorized_keys:2: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
debug1: Remote: /var/lib/gitlab/.ssh/authorized_keys:2: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding
Failed to get username: who='' is invalid
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eow#openssh.com reply 0
debug1: channel 0: free: client-session, nchannels 1
Transferred: sent 3468, received 3288 bytes, in 0.1 seconds
Bytes per second: sent 39481.4, received 37432.2
debug1: Exit status 1