Communication problem zabbix_proxy vs zabbix_agent

[Davvvid]

Hello everyone !
I encountered a communication problem with a zabbix_proxy and the agents behind.

While doing this command (from zabbix_proxy) :
/usr/local/bin/zabbix_get -s127.0.0.1 -p10050 -kagent.version
I received a correct output with the agent version.

If i do the following command on an host :
/usr/local/bin/zabbix_get -s192.9.201.205 -p10050 -kagent.version
Get value error: ZBX_TCP_READ() failed: [104] Connection reset by peer

If i telnet the host :
root@CENTRALP-PROXY:/home/pi# telnet 192.9.201.205 10050
Trying 192.9.201.205...
Connected to 192.9.201.205.
Escape character is '^]'.
Connection closed by foreign host.

root@CENTRALP-PROXY:/home/pi# zabbix_proxy -V
Zabbix proxy v2.4.0 (revision 48953) (11 September 2014)
Compilation time: Aug 11 2015 00:03:56

One the host :
1420:20150806:141839.310 Starting Zabbix Agent [JANUS]. Zabbix 2.4.0 (revision 48940).
Windows 2003 R2 SP2

Any idea ?
The proxy can ping all the hosts, there are all in the same subnet, there is no firewall actived on the hosts.

[Davvvid]

Here is the configuration on the host :

# This is a config file for the Zabbix agent daemon (Windows)
# To get more information about Zabbix, go to http://www.zabbix.com

############ GENERAL PARAMETERS #################

### Option: LogFile
# Name of log file.
# If not set, Windows Event Log is used.
#
# Mandatory: no
# Default:
# LogFile=

LogFile=c:\Program Files\Zabbix\zabbix_agentd.log

### Option: LogFileSize
# Maximum size of log file in MB.
# 0 - disable automatic log rotation.
#
# Mandatory: no
# Range: 0-1024
# Default:
# LogFileSize=1
LogFileSize=10

### 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)
#
# Mandatory: no
# Range: 0-4
# Default:
# DebugLevel=3
# DebugLevel=4

### Option: SourceIP
# Source IP address for outgoing connections.
#
# Mandatory: no
# Default:
# SourceIP=

### Option: EnableRemoteCommands
# Whether remote commands from Zabbix server are allowed.
# 0 - not allowed
# 1 - allowed
#
# Mandatory: no
# Default:
EnableRemoteCommands=1

### Option: LogRemoteCommands
# Enable logging of executed shell commands as warnings.
# 0 - disabled
# 1 - enabled
#
# Mandatory: no
# Default:
# LogRemoteCommands=0

##### Passive checks related

### Option: Server
# List of comma delimited IP addresses (or hostnames) of Zabbix servers.
# 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.
#
# Mandatory: no
# Default:
# Server=

Server=192.9.201.100

### 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
# ListenIP=192.9.201.205

### Option: StartAgents
# Number of pre-forked instances of zabbix_agentd that process passive checks.
# If set to 0, disables passive checks and the agent will not listen on any TCP port.
#
# Mandatory: no
# Range: 0-100
# Default:
# StartAgents=3

##### Active checks related

### Option: ServerActive
# List of comma delimited IPort (or hostnameort) pairs of Zabbix servers for active checks.
# If port is not specified, default port is used.
# 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: # ServerActive=127.0.0.1:20051,zabbix.domain,[::1]:30051,::1,[12fc::1]
#
# Mandatory: no
# Default:
# ServerActive=

# ServerActive=192.9.201.100:10051

### Option: Hostname
# Unique, case sensitive hostname.
# Required for active checks and must match hostname as configured on the server.
# Value is acquired from HostnameItem if undefined.
#
# Mandatory: no
# Default:
# Hostname=
# Hostname=JANUS

### 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: 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.
#
# Mandatory: no
# Range: 2-65535
# Default:
# BufferSize=100

### Option: MaxLinesPerSecond
# Maximum number of new lines the agent will send per second to Zabbix Server
# or Proxy processing 'log', 'logrt' and 'eventlog' active checks.
# The provided value will be overridden by the parameter 'maxlines',
# provided in 'log', 'logrt' or 'eventlog' item keys.
#
# Mandatory: no
# Range: 1-1000
# Default:
# MaxLinesPerSecond=100

############ 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 paging file usage in percents from the server:
# Alias=pg_usageerf_counter[\Paging File(_Total)\% Usage]
# Now shorthand key pg_usage may be used to retrieve data.
# Aliases can be used in HostMetadataItem but not in HostnameItem or PerfCounter parameters.
#
# Mandatory: no
# Range:
# Default:

### Option: Timeout
# Spend no more than Timeout seconds on processing
#
# Mandatory: no
# Range: 1-30
# Default:
# Timeout=3

### Option: PerfCounter
# Syntax: <parameter_name>,"<perf_counter_path>",<period>
# Defines new parameter <parameter_name> which is an average value for system performance counter <perf_counter_path> for the specified time period <period> (in seconds).
# For example, if you wish to receive average number of processor interrupts per second for last minute, you can define new parameter "interrupts" as following:
# PerfCounter = interrupts,"\Processor(0)\Interrupts/sec",60
# Please note double quotes around performance counter path.
# Samples for calculating average value will be taken every second.
# You may run "typeperf -qx" to get list of all performance counters available in Windows.
#
# Mandatory: no
# Range:
# Default:

### Option: Include
# You may include individual files in the configuration file.
#
# Mandatory: no
# Default:
# Include=

# Include=c:\zabbix\zabbix_agentd.userparams.conf
# Include=c:\zabbix\zabbix_agentd.conf.d\
# Include=c:\zabbix\zabbix_agentd.conf.d\*.conf

####### USER-DEFINED MONITORED PARAMETERS #######

### Option: UnsafeUserParameters
# Allow all characters to be passed in arguments to user-defined parameters.
# 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>
#
# Mandatory: no
# Default:
# UserParameter=

Thanks for your dear help.
D.

[Davvvid]

Hello team,

Any ideas ? is there some things to check ?
The zabbix server get data from the proxy. But the proxy cannot query the differents agents behind.

Thanks for your help.
D.

[Davvvid]

Hello team,
Nobody can help ?

One more thing :
When i perform the following command on the proxy server (which queries a zabbix agent), i don't get any value (empty prompt)

root@CENTRALP-PROXY:/home/pi# /usr/local/bin/zabbix_get -s192.9.201.205 -p10050 -kagent.version
root@CENTRALP-PROXY:/home/pi#

D.

[Davvvid]

Hello ?
Little update. Nobodies encountered this problem?
Regards.
D.

[mushero]

Looks like agent is disconnecting as only allows a connection from:

Server=192.9.201.100

So any localhost or others will fail and get reset, if I'm understanding your problem.

[aib]

At first, zabbix_agent listen and answer port 10050. But zabbix_server and zabbix_proxy listen port 10051.
So, when you use command zabbix_get to Agent - you are using the correct number.
But I'm not sure that you can get any data from server/proxy by requesting through zabbix_get. Sorry.

At second, in the configuration of zabbix_agent you have to include all servers/proxies which allowed to ask any data from agent. Your configuration string

Server=192.9.201.100

means that only one server, which has that IP, can request any data from agent.
To include any additional IP's, just extend the list of addresses, using comma between IP addresses.

Server=192.9.201.100,192.9.201.205

Please, don't ever use any spaces around comma!!!