X11 forwarding request failed on channel 0

x11 포워딩시 X11 forwarding request failed on channel 0 메시지 나오고 포워딩 안됨

[root@testpc ~]$ ssh -X root@192.168.7.x
root@192.168.7.x's password:
X11 forwarding request failed on channel 0

위와 같이 포워딩 실패 메시지 떨어짐

 

디버그 진행

 

[root@testpc ~]$ ssh -X root@192.168.7.x -v
OpenSSH_8.3p1, OpenSSL 1.1.1g  21 Apr 2020
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Connecting to 192.168.7.x [192.168.7.x] port 22.
debug1: Connection established.
debug1: identity file /home/root/.ssh/id_rsa type 0
debug1: identity file /home/root/.ssh/id_rsa-cert type -1
debug1: identity file /home/root/.ssh/id_dsa type -1
debug1: identity file /home/root/.ssh/id_dsa-cert type -1
debug1: identity file /home/root/.ssh/id_ecdsa type -1
debug1: identity file /home/root/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/root/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/root/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/root/.ssh/id_ed25519 type -1
debug1: identity file /home/root/.ssh/id_ed25519-cert type -1
debug1: identity file /home/root/.ssh/id_ed25519_sk type -1
debug1: identity file /home/root/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/root/.ssh/id_xmss type -1
debug1: identity file /home/root/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.3
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 192.168.7.x:22 as 'root'
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 SHA256:3I4Bo9LcxDzfrqX5pV1eMQ4K0dWf/31112ZzMIIeOEA
debug1: Host '192.168.7.x' is known and matches the ECDSA host key.
debug1: Found key in /home/root/.ssh/known_hosts:31
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/root/.ssh/id_rsa RSA SHA256:I8Ize5vPim2Q0WNnKr57G49uBrfRUu4PjePPfTyytzo
debug1: Will attempt key: /home/root/.ssh/id_dsa
debug1: Will attempt key: /home/root/.ssh/id_ecdsa
debug1: Will attempt key: /home/root/.ssh/id_ecdsa_sk
debug1: Will attempt key: /home/root/.ssh/id_ed25519
debug1: Will attempt key: /home/root/.ssh/id_ed25519_sk
debug1: Will attempt key: /home/root/.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
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Next authentication method: publickey
debug1: Offering public key: /home/root/.ssh/id_rsa RSA SHA256:I8Ize5vPim2Q0WNnKr57G49uBrfRUu4PjePPfTyytzo
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Trying private key: /home/root/.ssh/id_dsa
debug1: Trying private key: /home/root/.ssh/id_ecdsa
debug1: Trying private key: /home/root/.ssh/id_ecdsa_sk
debug1: Trying private key: /home/root/.ssh/id_ed25519
debug1: Trying private key: /home/root/.ssh/id_ed25519_sk
debug1: Trying private key: /home/root/.ssh/id_xmss
debug1: Next authentication method: password
root@192.168.7.x's password:
debug1: Authentication succeeded (password).
Authenticated to 192.168.7.x ([192.168.7.x]: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: Requesting X11 forwarding with authentication spoofing.
debug1: Remote: No xauth program; cannot forward with spoofing.
X11 forwarding request failed on channel 0
Last login: Tue Jun  2 16:18:51 2020 from 192.168.0.x

debug1: Requesting X11 forwarding with authentication spoofing.

debug1: Remote: No xauth program; cannot forward with spoofing.

 

xauth 프로그램이 없어서 발생 한 문제

 

#yum install -y xorg-x11-xauth

 

이후 접속하면 debug1: Requesting X11 forwarding with authentication spoofing.

 

메시지 뜨며 잘 된다