On Arch Linux I can login to my server with an ssh-key with no passphrase.
I copied the ssh-key into my WSL1 .ssh Folder and added the server/key configuration to .ssh/config. Now when I want to login into my server from within WSL I am asked to enter a passphrase, which, obviously, I am not able to do and the login fails.
Why am I supposed to enter a passphrase for a key that has no passphrase and works well on Linux?
ssh -vvv melusinapress.lu
OpenSSH_8.2p1 Ubuntu-4ubuntu0.1, OpenSSL 1.1.1f 31 Mar 2020
debug1: Reading configuration data /home/niels/.ssh/config
debug1: /home/niels/.ssh/config line 6: Applying options for melusinapress.lu
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 *
debug2: resolving "melusinapress.lu" port 22
debug2: ssh_connect_direct
debug1: Connecting to melusinapress.lu [104.248.135.159] port 22.
debug1: Connection established.
debug1: identity file /home/niels/.ssh/id_rsa_do_mp type 0
debug1: identity file /home/niels/.ssh/id_rsa_do_mp-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_7.6p1 Ubuntu-4ubuntu0.3
debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 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
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to melusinapress.lu:22 as 'XXXXXXXXXXXX'
debug3: hostkeys_foreach: reading file "/home/niels/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/niels/.ssh/known_hosts:10
debug3: load_hostkeys: loaded 1 keys from melusinapress.lu
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
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,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],ssh-ed25519,[email protected],rsa-sha2-512,rsa-sha2-256,ssh-rsa
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: 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
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,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]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:6tsDRZFslPDOZRjFw84fSoqHQMpX5i9Ewkn70DVtFVk
debug3: hostkeys_foreach: reading file "/home/niels/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/niels/.ssh/known_hosts:10
debug3: load_hostkeys: loaded 1 keys from melusinapress.lu
debug3: hostkeys_foreach: reading file "/home/niels/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/niels/.ssh/known_hosts:8
debug3: load_hostkeys: loaded 1 keys from 104.248.135.159
debug1: Host 'melusinapress.lu' is known and matches the ECDSA host key.
debug1: Found key in /home/niels/.ssh/known_hosts:10
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 134217728 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 134217728 blocks
debug1: Will attempt key: /home/niels/.ssh/id_rsa_do_mp RSA SHA256:yAL0xd2pAuyso0lk4rHd1IKkAtOVtoLV366NdPwfj/U explicit
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
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>
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 gssapi-with-mic,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: /home/niels/.ssh/id_rsa_do_mp RSA SHA256:yAL0xd2pAuyso0lk4rHd1IKkAtOVtoLV366NdPwfj/U explicit
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: /home/niels/.ssh/id_rsa_do_mp RSA SHA256:yAL0xd2pAuyso0lk4rHd1IKkAtOVtoLV366NdPwfj/U explicit
debug3: sign_and_send_pubkey: RSA SHA256:yAL0xd2pAuyso0lk4rHd1IKkAtOVtoLV366NdPwfj/U
debug3: sign_and_send_pubkey: signing using rsa-sha2-512 SHA256:yAL0xd2pAuyso0lk4rHd1IKkAtOVtoLV366NdPwfj/U
Enter passphrase for key '/home/niels/.ssh/id_rsa_do_mp':
(Disclaimer: the key once had a passphrase but I eliminated the passphrase for that key. There were never any problems on Arch Linux with it. Of cause, I tried out the old passphrase, just to see what happens, but the login fails anyway; likewise just hitting return fails.)