如何使用 Open SSH 限制与 SFTP 服务器的同时连接数

Question

我使用 Open SSH 在 AWS 的 Windows 实例上设置了一个 SFTP 服务器，该服务器将由 A 和 B 两方使用，B 会将一些文件放入 SFTP 服务器，而 A 会检索这些文件，我需要将 SFTP 中的同时连接数限制为 1，这样 A 就不会在 B 将文件放入 SFTP 的同时检索文件（存在检索不完整文件的风险）。因此，将 SFTP 服务器的同时连接数限制为 1，这样当每一方尝试连接到服务器并收到最大连接错误时，它都会等待一段时间再重新连接（每一方本质上都是一个计算机程序）。

问题是，当我将MaxSessionsandMaxStartups改为sshd_config1 时，它仍然允许我同时运行 2 个或更多连接。

这是服务器的 sshd_config：

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

#HostKey __PROGRAMDATA__/ssh/ssh_host_rsa_key
#HostKey __PROGRAMDATA__/ssh/ssh_host_dsa_key
#HostKey __PROGRAMDATA__/ssh/ssh_host_ecdsa_key
#HostKey __PROGRAMDATA__/ssh/ssh_host_ed25519_key

# Ciphers and keying
#RekeyLimit default none

# Logging
SyslogFacility LOCAL0
LogLevel VERBOSE

# Authentication:

#LoginGraceTime 2m
#PermitRootLogin prohibit-password
#StrictModes yes
#MaxAuthTries 6
MaxSessions 1

#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

# For this to work you will also need host keys in %programData%/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 no

#AllowAgentForwarding yes
#AllowTcpForwarding yes
#GatewayPorts no
#PermitTTY yes
#PrintMotd yes
#PrintLastLog yes
#TCPKeepAlive yes
#UseLogin no
#PermitUserEnvironment no
#ClientAliveInterval 0
#ClientAliveCountMax 3
#UseDNS no
#PidFile /var/run/sshd.pid
MaxStartups 1
#PermitTunnel no
#ChrootDirectory none
#VersionAddendum none

# no default banner path
#Banner none

# override default of no subsystems
Subsystem   sftp    sftp-server.exe

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