解决 Arch Linux X11 转发不启用的问题

mobaXterm X11 连接失败

     ┌────────────────────────────────────────────────────────────────────┐
     │                        • MobaXterm 20.2 •                          │
     │            (SSH client, X-server and networking tools)             │
     │                                                                    │
     │ ➤ SSH session to xxx@xxx                       │
     │   • SSH compression : ✔                                            │
     │   • SSH-browser     : ✔                                            │
     │   • X11-forwarding  : ✘  (disabled or not supported by server)     │
     │   • DISPLAY         : xxx.xxx.xxx.xxx:0.0                           │
     │                                                                    │
     │ ➤ For more info, ctrl+click on help or visit our website           │
     └────────────────────────────────────────────────────────────────────┘

查看 Arch Linux 版本信息

➜  ~ uname -a
Linux archlinux 5.4.43-1-lts #1 SMP Wed, 27 May 2020 23:42:34 +0000 x86_64 GNU/Linux

安装 xorg-xauth

yay -S xorg-xauth

创建 .Xauthority 文件

➜  ~ touch ~/.Xauthority && chmod 600 ~/.Xauthority

修改 sshd_config

sudo vim /etc/ssh/sshd_config

AddressFamily any -> AddressFamily inet

#       $OpenBSD: sshd_config,v 1.103 2018/04/09 20:41:22 tj Exp $

# This is the sshd server system-wide configuration file.  See
# sshd_config(5) for more information.

# This sshd was compiled with PATH=/usr/local/sbin:/usr/local/bin:/usr/bin

# The strategy used for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented.  Uncommented options override the
# default value.

Port 22
#AddressFamily any
AddressFamily inet
#ListenAddress 0.0.0.0
#ListenAddress ::

#HostKey /etc/ssh/ssh_host_rsa_key
#HostKey /etc/ssh/ssh_host_ecdsa_key
#HostKey /etc/ssh/ssh_host_ed25519_key

# Ciphers and keying
#RekeyLimit default none

# Logging
#SyslogFacility AUTH
#LogLevel INFO

# Authentication:

#LoginGraceTime 2m
PermitRootLogin prohibit-password
StrictModes yes
MaxAuthTries 6
MaxSessions 10

PubkeyAuthentication yes

# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
AuthorizedKeysFile      .ssh/authorized_keys

#AuthorizedPrincipalsFile none

#AuthorizedKeysCommand none
#AuthorizedKeysCommandUser nobody

# For this to work you will also need host keys in /etc/ssh/ssh_known_hosts
#HostbasedAuthentication no
# Change to yes if you don't trust ~/.ssh/known_hosts for
# HostbasedAuthentication
#IgnoreUserKnownHosts no
# Don't read the user's ~/.rhosts and ~/.shosts files
#IgnoreRhosts yes

# To disable tunneled clear text passwords, change to no here!
PasswordAuthentication yes
PermitEmptyPasswords yes

# Change to no to disable s/key passwords
ChallengeResponseAuthentication no

# Kerberos options
#KerberosAuthentication no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
#KerberosGetAFSToken no

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication.  Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes

AllowAgentForwarding yes
AllowTcpForwarding yes
#GatewayPorts no
X11Forwarding yes
#ForwardX11Trusted yes
X11DisplayOffset 10
X11UseLocalhost yes
#PermitTTY yes
#PrintMotd no # pam does that
#PrintLastLog yes
TCPKeepAlive yes
#PermitUserEnvironment no
#Compression delayed
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /run/sshd.pid
#MaxStartups 10:30:100
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none

# no default banner path
#Banner none

# override default of no subsystems
Subsystem       sftp    /usr/lib/ssh/sftp-server

# Example of overriding settings on a per-user basis
#Match User anoncvs
#       X11Forwarding yes
#       AllowTcpForwarding yes
#       PermitTTY no
#       ForceCommand cvs server

重启 sshd 服务

sudo systemctl reload sshd.service
sudo systemctl restart sshd.service

mobaXterm X11 连接成功

     ┌────────────────────────────────────────────────────────────────────┐
     │                        • MobaXterm 20.2 •                          │
     │            (SSH client, X-server and networking tools)             │
     │                                                                    │
     │ ➤ SSH session to xxx@xxx                      │
     │   • SSH compression : ✔                                            │
     │   • SSH-browser     : ✔                                            │
     │   • X11-forwarding  : ✔  (remote display is forwarded through SSH) │
     │   • DISPLAY         : ✔  (automatically set on remote server)      │
     │                                                                    │
     │ ➤ For more info, ctrl+click on help or visit our website           │
     └────────────────────────────────────────────────────────────────────┘