我在我的服务器上运行 zabbix 代理，但遇到了这个问题：当服务器尝试连接到它时，我在 /var/log/zabbix/zabbix_agent2.log 中收到以下错误消息：
2022/06/30 18:35:38.627607 cannot accept incoming connection for peer: 172.16.238.2
2022/06/30 18:35:52.433324 [101] In refreshActiveChecks() from [172.16.239.40:10051]
2022/06/30 18:35:52.433379 connecting to [172.16.239.40:10051] [timeout:3s, connection timeout:3s]
2022/06/30 18:35:52.433616 sending [{"request":"active checks","host":"Zabbix server","version":"6.0"}] to [172.16.239.40:10051]
2022/06/30 18:35:52.433971 receiving data from [172.16.239.40:10051]
2022/06/30 18:35:52.451945 received [{"response":"success","data":[]}] from [172.16.239.40:10051]
2022/06/30 18:35:52.452089 [101] End of refreshActiveChecks() from [172.16.239.40:10051]
2022/06/30 18:35:52.452104 [101] processing update request (0 requests)
2022/06/30 18:35:52.452109 [101] skipping empty update for unregistered client
2022/06/30 18:36:38.672626 cannot accept incoming connection for peer: 172.16.238.2
您注意到这是前端（172.16.238.2）的问题，但后端没问题（172.16.239.40）。
我该如何解决这个问题？我尝试设置 DebugLevel=5 以获取更多详细信息，但结果是一样的。
代理和服务器位于同一主机上。
这是我的conf文件（除了服务器ip之外几乎是默认的）
############ GENERAL PARAMETERS #################
### Option: PidFile
# Name of PID file.
#
# Mandatory: no
# Default:
# PidFile=/tmp/zabbix_agent2.pid
PidFile=/var/run/zabbix/zabbix_agent2.pid
DebugLevel=5
### Option: LogType
# Specifies where log messages are written to:
# system - syslog
# file - file specified with LogFile parameter
# console - standard output
#
# Mandatory: no
# Default:
# LogType=file
### Option: LogFile
# Log file name for LogType 'file' parameter.
#
# Mandatory: yes, if LogType is set to file, otherwise no
# Default:
# LogFile=/tmp/zabbix_agent2.log
LogFile=/var/log/zabbix/zabbix_agent2.log
### Option: LogFileSize
# Maximum size of log file in MB.
# 0 - disable automatic log rotation.
#
# Mandatory: no
# Range: 0-1024
# Default:
# LogFileSize=1
LogFileSize=0
### Option: DebugLevel
# Specifies debug level:
# 0 - basic information about starting and stopping of Zabbix processes
# 1 - critical information
# 2 - error information
# 3 - warnings
# 4 - for debugging (produces lots of information)
# 5 - extended debugging (produces even more information)
#
# Mandatory: no
# Range: 0-5
# Default:
# DebugLevel=3
### Option: SourceIP
# Source IP address for outgoing connections.
#
# Mandatory: no
# Default:
# SourceIP=
##### Passive checks related
### Option: Server
# List of comma delimited IP addresses, optionally in CIDR notation, or DNS names of Zabbix servers and Zabbix proxies.
# Incoming connections will be accepted only from the hosts listed here.
# If IPv6 support is enabled then '127.0.0.1', '::127.0.0.1', '::ffff:127.0.0.1' are treated equally
# and '::/0' will allow any IPv4 or IPv6 address.
# '0.0.0.0/0' can be used to allow any IPv4 address.
# Example: Server=172.16.239.40,192.168.1.0/24,::1,2001:db8::/32,zabbix.example.com
#
# Mandatory: yes, if StartAgents is not explicitly set to 0
# Default:
# Server=
Server=172.16.239.40
### Option: ListenPort
# Agent will listen on this port for connections from the server.
#
# Mandatory: no
# Range: 1024-32767
# Default:
# ListenPort=10050
### Option: ListenIP
# List of comma delimited IP addresses that the agent should listen on.
# First IP address is sent to Zabbix server if connecting to it to retrieve list of active checks.
#
# Mandatory: no
# Default:
# ListenIP=0.0.0.0
### Option: StatusPort
# Agent will listen on this port for HTTP status requests.
#
# Mandatory: no
# Range: 1024-32767
# Default:
# StatusPort=
##### Active checks related
### Option: ServerActive
# List of comma delimited IP addresses or DNS names (address:port) pairs or clusters (address:port;address2:port) of Zabbix servers and Zabbix proxies for active checks.
# If port is not specified, default port is used.
# Cluster nodes need be separated by semicolon.
# IPv6 addresses must be enclosed in square brackets if port for that host is specified.
# If port is not specified, square brackets for IPv6 addresses are optional.
# If this parameter is not specified, active checks are disabled.
# Example for multiple servers:
# ServerActive=172.16.239.40:20051,zabbix.domain,[::1]:30051,::1,[12fc::1]
# Example for HA:
# ServerActive=zabbix.cluster.node1;zabbix.cluster.node2:20051;zabbix.cluster.node3
# Example for HA with two clusters and one server:
# ServerActive=zabbix.cluster.node1;zabbix.cluster.node2:20051,zabbix.cluster2.node1;zabbix.cluster2.node2,zabbix.domain
#
# Mandatory: no
# Default:
# ServerActive=
ServerActive=172.16.239.40
### Option: Hostname
# List of comma delimited unique, case sensitive hostnames.
# Required for active checks and must match hostnames as configured on the server.
# Value is acquired from HostnameItem if undefined.
#
# Mandatory: no
# Default:
# Hostname=
Hostname=Zabbix server
### Option: HostnameItem
# Item used for generating Hostname if it is undefined. Ignored if Hostname is defined.
# Does not support UserParameters or aliases.
#
# Mandatory: no
# Default:
# HostnameItem=system.hostname
### Option: HostMetadata
# Optional parameter that defines host metadata.
# Host metadata is used at host auto-registration process.
# An agent will issue an error and not start if the value is over limit of 255 characters.
# If not defined, value will be acquired from HostMetadataItem.
#
# Mandatory: no
# Range: 0-255 characters
# Default:
# HostMetadata=
### Option: HostMetadataItem
# Optional parameter that defines an item used for getting host metadata.
# Host metadata is used at host auto-registration process.
# During an auto-registration request an agent will log a warning message if
# the value returned by specified item is over limit of 255 characters.
# This option is only used when HostMetadata is not defined.
#
# Mandatory: no
# Default:
# HostMetadataItem=
### Option: HostInterface
# Optional parameter that defines host interface.
# Host interface is used at host auto-registration process.
# An agent will issue an error and not start if the value is over limit of 255 characters.
# If not defined, value will be acquired from HostInterfaceItem.
#
# Mandatory: no
# Range: 0-255 characters
# Default:
# HostInterface=
### Option: HostInterfaceItem
# Optional parameter that defines an item used for getting host interface.
# Host interface is used at host auto-registration process.
# During an auto-registration request an agent will log a warning message if
# the value returned by specified item is over limit of 255 characters.
# This option is only used when HostInterface is not defined.
#
# Mandatory: no
# Default:
# HostInterfaceItem=
### Option: RefreshActiveChecks
# How often list of active checks is refreshed, in seconds.
#
# Mandatory: no
# Range: 60-3600
# Default:
# RefreshActiveChecks=120
### Option: BufferSend
# Do not keep data longer than N seconds in buffer.
#
# Mandatory: no
# Range: 1-3600
# Default:
# BufferSend=5
### Option: BufferSize
# Maximum number of values in a memory buffer. The agent will send
# all collected data to Zabbix Server or Proxy if the buffer is full.
# Option is not valid if EnablePersistentBuffer=1
#
# Mandatory: no
# Range: 2-65535
# Default:
# BufferSize=100
### Option: EnablePersistentBuffer
# Enable usage of local persistent storage for active items.
# 0 - disabled, in-memory buffer is used (default); 1 - use persistent buffer
# Mandatory: no
# Range: 0-1
# Default:
# EnablePersistentBuffer=0
### Option: PersistentBufferPeriod
# Zabbix Agent2 will keep data for this time period in case of no
# connectivity with Zabbix server or proxy. Older data will be lost. Log data will be preserved.
# Option is valid if EnablePersistentBuffer=1
#
# Mandatory: no
# Range: 1m-365d
# Default:
# PersistentBufferPeriod=1h
### Option: PersistentBufferFile
# Full filename. Zabbix Agent2 will keep SQLite database in this file.
# Option is valid if EnablePersistentBuffer=1
#
# Mandatory: no
# Default:
# PersistentBufferFile=
############ ADVANCED PARAMETERS #################
### Option: Alias
# Sets an alias for an item key. It can be used to substitute long and complex item key with a smaller and simpler one.
# Multiple Alias parameters may be present. Multiple parameters with the same Alias key are not allowed.
# Different Alias keys may reference the same item key.
# For example, to retrieve the ID of user 'zabbix':
# Alias=zabbix.userid:vfs.file.regexp[/etc/passwd,^zabbix:.:([0-9]+),,,,\1]
# Now shorthand key zabbix.userid may be used to retrieve data.
# Aliases can be used in HostMetadataItem but not in HostnameItem parameters.
#
# Mandatory: no
# Range:
# Default:
### Option: Timeout
# Spend no more than Timeout seconds on processing
#
# Mandatory: no
# Range: 1-30
# Default:
# Timeout=3
### Option: Include
# You may include individual files or all files in a directory in the configuration file.
# Installing Zabbix will create include directory in /usr/local/etc, unless modified during the compile time.
#
# Mandatory: no
# Default:
# Include=
Include=/etc/zabbix/zabbix_agent2.d/*.conf
# Include=/usr/local/etc/zabbix_agent2.userparams.conf
# Include=/usr/local/etc/zabbix_agent2.conf.d/
# Include=/usr/local/etc/zabbix_agent2.conf.d/*.conf
### Option:PluginTimeout
# Timeout for connections with external plugins.
#
# Mandatory: no
# Range: 1-30
# Default: <Global timeout>
# PluginTimeout=
### Option:PluginSocket
# Path to unix socket for external plugin communications.
#
# Mandatory: no
# Default:/tmp/agent.plugin.sock
# PluginSocket=
####### USER-DEFINED MONITORED PARAMETERS #######
### Option: UnsafeUserParameters
# Allow all characters to be passed in arguments to user-defined parameters.
# The following characters are not allowed:
# \ ' " ` * ? [ ] { } ~ $ ! & ; ( ) < > | # @
# Additionally, newline characters are not allowed.
# 0 - do not allow
# 1 - allow
#
# Mandatory: no
# Range: 0-1
# Default:
# UnsafeUserParameters=0
### Option: UserParameter
# User-defined parameter to monitor. There can be several user-defined parameters.
# Format: UserParameter=<key>,<shell command>
# See 'zabbix_agentd' directory for examples.
#
# Mandatory: no
# Default:
# UserParameter=
### Option: UserParameterDir
# Directory to execute UserParameter commands from. Only one entry is allowed.
# When executing UserParameter commands the agent will change the working directory to the one
# specified in the UserParameterDir option.
# This way UserParameter commands can be specified using the relative ./ prefix.
#
# Mandatory: no
# Default:
# UserParameterDir=
### Option: ControlSocket
# The control socket, used to send runtime commands with '-R' option.
#
# Mandatory: no
# Default:
# ControlSocket=
ControlSocket=/tmp/agent.sock
####### TLS-RELATED PARAMETERS #######
### Option: TLSConnect
# How the agent should connect to server or proxy. Used for active checks.
# Only one value can be specified:
# unencrypted - connect without encryption
# psk - connect using TLS and a pre-shared key
# cert - connect using TLS and a certificate
#
# Mandatory: yes, if TLS certificate or PSK parameters are defined (even for 'unencrypted' connection)
# Default:
# TLSConnect=unencrypted
### Option: TLSAccept
# What incoming connections to accept.
# Multiple values can be specified, separated by comma:
# unencrypted - accept connections without encryption
# psk - accept connections secured with TLS and a pre-shared key
# cert - accept connections secured with TLS and a certificate
#
# Mandatory: yes, if TLS certificate or PSK parameters are defined (even for 'unencrypted' connection)
# Default:
# TLSAccept=unencrypted
### Option: TLSCAFile
# Full pathname of a file containing the top-level CA(s) certificates for
# peer certificate verification.
#
# Mandatory: no
# Default:
# TLSCAFile=
### Option: TLSCRLFile
# Full pathname of a file containing revoked certificates.
#
# Mandatory: no
# Default:
# TLSCRLFile=
### Option: TLSServerCertIssuer
# Allowed server certificate issuer.
#
# Mandatory: no
# Default:
# TLSServerCertIssuer=
### Option: TLSServerCertSubject
# Allowed server certificate subject.
#
# Mandatory: no
# Default:
# TLSServerCertSubject=
### Option: TLSCertFile
# Full pathname of a file containing the agent certificate or certificate chain.
#
# Mandatory: no
# Default:
# TLSCertFile=
### Option: TLSKeyFile
# Full pathname of a file containing the agent private key.
#
# Mandatory: no
# Default:
# TLSKeyFile=
### Option: TLSPSKIdentity
# Unique, case sensitive string used to identify the pre-shared key.
#
# Mandatory: no
# Default:
# TLSPSKIdentity=
### Option: TLSPSKFile
# Full pathname of a file containing the pre-shared key.
#
# Mandatory: no
# Default:
# TLSPSKFile=
####### PLUGIN-SPECIFIC PARAMETERS #######
### Option: Plugins
# A plugin can have one or more plugin specific configuration parameters in format:
# Plugins.<PluginName>.<Parameter1>=<value1>
# Plugins.<PluginName>.<Parameter2>=<value2>
#
# Mandatory: no
# Range:
# Default:
### Option: Plugins.Log.MaxLinesPerSecond
# Maximum number of new lines the agent will send per second to Zabbix Server
# or Proxy processing 'log' and 'logrt' active checks.
# The provided value will be overridden by the parameter 'maxlines',
# provided in 'log' or 'logrt' item keys.
#
# Mandatory: no
# Range: 1-1000
# Default:
# Plugins.Log.MaxLinesPerSecond=20
### Option: AllowKey
# Allow execution of item keys matching pattern.
# Multiple keys matching rules may be defined in combination with DenyKey.
# Key pattern is wildcard expression, which support "*" character to match any number of any characters in certain position. It might be used in both key name and key arguments.
# Parameters are processed one by one according their appearance order.
# If no AllowKey or DenyKey rules defined, all keys are allowed.
#
# Mandatory: no
### Option: DenyKey
# Deny execution of items keys matching pattern.
# Multiple keys matching rules may be defined in combination with AllowKey.
# Key pattern is wildcard expression, which support "*" character to match any number of any characters in certain position. It might be used in both key name and key arguments.
# Parameters are processed one by one according their appearance order.
# If no AllowKey or DenyKey rules defined, all keys are allowed.
# Unless another system.run[*] rule is specified DenyKey=system.run[*] is added by default.
#
# Mandatory: no
# Default:
# DenyKey=system.run[*]
### Option: Plugins.SystemRun.LogRemoteCommands
# Enable logging of executed shell commands as warnings.
# 0 - disabled
# 1 - enabled
#
# Mandatory: no
# Default:
# Plugins.SystemRun.LogRemoteCommands=0
### Option: ForceActiveChecksOnStart
# Perform active checks immediately after restart for first received configuration.
# Also available as per plugin configuration, example: Plugins.Uptime.System.ForceActiveChecksOnStart=1
#
# Mandatory: no
# Range: 0-1
# Default:
# ForceActiveChecksOnStart=0
# Include configuration files for plugins
Include=./zabbix_agent2.d/plugins.d/*.conf
答案是将后端和前端IP地址都放在conf文件中的
server=serveractive=Server=172.16.239.40, 172.16.238.2
ServerActive=172.16.239.40, 172.16.238.2