When I try to have a ssh connection to a remote machine, its freezes if I don't use ForwardX11 variable as -Y. The terminal get freezes and I cannot cancel the operation, I have to close the terminal to exit.
What may be the main reason for this kind of problem?
Can ssh automatically try another approach to make new connection attempt or force connnection without using a ForwardX11 variable?
My debug outputs:
Attemp that freeze during ssh connection:
$ ssh -v user@IP OpenSSH_8.1p1, LibreSSL 2.7.3 debug1: Reading configuration data /Users/alper/.ssh/config debug1: /Users/alper/.ssh/config line 9: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 47: Applying options for * debug1: /etc/ssh/ssh_config line 51: Applying options for * debug1: Connecting to 192.168.1.8 [192.168.1.8] port 22. debug1: Connection established. debug1: identity file /Users/alper/.ssh/id_rsa type 0 debug1: identity file /Users/alper/.ssh/id_rsa-cert type -1 debug1: identity file /Users/alper/.ssh/id_dsa type -1 debug1: identity file /Users/alper/.ssh/id_dsa-cert type -1 debug1: identity file /Users/alper/.ssh/id_ecdsa type -1 debug1: identity file /Users/alper/.ssh/id_ecdsa-cert type -1 debug1: identity file /Users/alper/.ssh/id_ed25519 type -1 debug1: identity file /Users/alper/.ssh/id_ed25519-cert type -1 debug1: identity file /Users/alper/.ssh/id_xmss type -1 debug1: identity file /Users/alper/.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_8.2p1 Ubuntu-4ubuntu0.2 debug1: match: OpenSSH_8.2p1 Ubuntu-4ubuntu0.2 pat OpenSSH* compat 0x04000000 debug1: Authenticating to 192.168.1.8:22 as 'alper' 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:ukLpqw3yNMx9D29UnmY5rSJRc6Y0ENlAK2R2DNjyljY debug1: Host '192.168.1.8' is known and matches the ECDSA host key. debug1: Found key in /Users/alper/.ssh/known_hosts:51 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: /Users/alper/.ssh/id_rsa RSA SHA256:5HDbKAE8ePtTuGB48GSxWzeykOSUKKO5fxG2ub7YTvc debug1: Will attempt key: /Users/alper/.ssh/id_dsa debug1: Will attempt key: /Users/alper/.ssh/id_ecdsa debug1: Will attempt key: /Users/alper/.ssh/id_ed25519 debug1: Will attempt key: /Users/alper/.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,password debug1: Next authentication method: publickey debug1: Offering public key: /Users/alper/.ssh/id_rsa RSA SHA256:5HDbKAE8ePtTuGB48GSxWzeykOSUKKO5fxG2ub7YTvc debug1: Server accepts key: /Users/alper/.ssh/id_rsa RSA SHA256:5HDbKAE8ePtTuGB48GSxWzeykOSUKKO5fxG2ub7YTvc debug1: Authentication succeeded (publickey). Authenticated to 192.168.1.8 ([192.168.1.8]:22). debug1: channel 0: new [client-session] debug1: Requesting no-more-sessions@openssh.com debug1: Entering interactive session. debug1: pledge: exec debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0 debug1: Remote: /home/alper/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding debug1: Remote: /home/alper/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding Working connection:
$ ssh -Yv user@IP OpenSSH_8.1p1, LibreSSL 2.7.3 debug1: Reading configuration data /Users/alper/.ssh/config debug1: /Users/alper/.ssh/config line 9: Applying options for * debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 47: Applying options for * debug1: /etc/ssh/ssh_config line 51: Applying options for * debug1: Connecting to 192.168.1.8 [192.168.1.8] port 22. debug1: Connection established. debug1: identity file /Users/alper/.ssh/id_rsa type 0 debug1: identity file /Users/alper/.ssh/id_rsa-cert type -1 debug1: identity file /Users/alper/.ssh/id_dsa type -1 debug1: identity file /Users/alper/.ssh/id_dsa-cert type -1 debug1: identity file /Users/alper/.ssh/id_ecdsa type -1 debug1: identity file /Users/alper/.ssh/id_ecdsa-cert type -1 debug1: identity file /Users/alper/.ssh/id_ed25519 type -1 debug1: identity file /Users/alper/.ssh/id_ed25519-cert type -1 debug1: identity file /Users/alper/.ssh/id_xmss type -1 debug1: identity file /Users/alper/.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_8.2p1 Ubuntu-4ubuntu0.2 debug1: match: OpenSSH_8.2p1 Ubuntu-4ubuntu0.2 pat OpenSSH* compat 0x04000000 debug1: Authenticating to 192.168.1.8:22 as 'alper' 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:ukLpqw3yNMx9D29UnmY5rSJRc6Y0ENlAK2R2DNjyljY debug1: Host '192.168.1.8' is known and matches the ECDSA host key. debug1: Found key in /Users/alper/.ssh/known_hosts:51 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: /Users/alper/.ssh/id_rsa RSA SHA256:5HDbKAE8ePtTuGB48GSxWzeykOSUKKO5fxG2ub7YTvc debug1: Will attempt key: /Users/alper/.ssh/id_dsa debug1: Will attempt key: /Users/alper/.ssh/id_ecdsa debug1: Will attempt key: /Users/alper/.ssh/id_ed25519 debug1: Will attempt key: /Users/alper/.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,password debug1: Next authentication method: publickey debug1: Offering public key: /Users/alper/.ssh/id_rsa RSA SHA256:5HDbKAE8ePtTuGB48GSxWzeykOSUKKO5fxG2ub7YTvc debug1: Server accepts key: /Users/alper/.ssh/id_rsa RSA SHA256:5HDbKAE8ePtTuGB48GSxWzeykOSUKKO5fxG2ub7YTvc debug1: Authentication succeeded (publickey). Authenticated to 192.168.1.8 ([192.168.1.8]:22). debug1: channel 0: new [client-session] debug1: Requesting no-more-sessions@openssh.com debug1: Entering interactive session. debug1: pledge: exec debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0 debug1: Remote: /home/alper/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding debug1: Remote: /home/alper/.ssh/authorized_keys:1: key options: agent-forwarding port-forwarding pty user-rc x11-forwarding debug1: Requesting X11 forwarding with authentication spoofing. debug1: Requesting authentication agent forwarding. debug1: Sending environment. debug1: Sending env LC_TERMINAL_VERSION = 3.4.20210315-nightly debug1: Sending env LC_CTYPE = en_US.UTF-8 debug1: Sending env LC_TERMINAL = iTerm2 debug1: Sending env LC_ALL = en_US.UTF-8 debug1: Sending env LANG = en_US.UTF-8 
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