cannot connect to [[127.0.0.1]:10051

[me2017]

I'm using Zabbix 3.2.6 on CentOS 7.3.1611. I see this every time I give 'systemctl restart zabbix-agent' Strangely, the host is reporting in the server's host configuration and everything seems to be functioning just fine.

3816:20170523:111111.975 active check configuration update from [127.0.0.1:10051] started to fail (cannot connect to [[127.0.0.1]:10051]: [111] Connection refused)

If I ask for more detail, DebugLevel=4

  3973:20170523:111638.312 __zbx_zbx_setproctitle() title:'listener #1 [waiting for connection]'
  3976:20170523:111638.795 In send_buffer() host:'127.0.0.1' port:10051 entries:0/100
  3976:20170523:111638.795 End of send_buffer():SUCCEED

I don't see 10051 listening...

# netstat -na | grep 10051

And it's not defined in my config...

# grep 10051 /etc/zabbix/zabbix_agentd.conf

Can someone explain what's up here?

[me2017]

Solved, with a stroke of genius:

## ServerActive=127.0.0.1

[gonsalves2003]

Solved, with a stroke of genius:

## ServerActive=127.0.0.1

How did you resolve this? I am still struggling with the same issue.
I have the following in my agent conf file. 192.168.25.5 is my Zabbix Server:

EnableRemoteCommands=1
Server=192.168.25.5
ServerActive=192.168.25.5
Hostname=FileServer01

[me2017]

I think in my case I found simply that

 ServerActive=127.0.0.1

was set so I commented it out.

I may have also had trouble with tcp wrappers. I have 127.0.0.1 included for ssh.

I'm not sure what issue you're experiencing but since this is the server you're having trouble with also check /etc/zabbix/web/zabbix.conf.php

Here is my servers /etc/zabbix/zabbix_agentd.conf:

PidFile=/var/run/zabbix/zabbix_agentd.pid
LogType=file
LogFile=/var/log/zabbix/zabbix.log
DebugLevel=3
EnableRemoteCommands=0
LogRemoteCommands=0
Server=192.168.1.5
ListenPort=10050
ListenIP=192.168.1.5
StartAgents=3
ServerActive=192.168.1.5
Hostname=ktlo01
RefreshActiveChecks=120
BufferSend=5
BufferSize=100
MaxLinesPerSecond=100
Timeout=3
AllowRoot=0
User=zabbix
Include=/etc/zabbix/zabbix_agentd.d
UnsafeUserParameters=1
LoadModulePath=/usr/lib/modules

[gonsalves2003]

I think in my case I found simply that

 ServerActive=127.0.0.1

was set so I commented it out.
[/CODE]

Aah!! Mine is a windows Agent and I added all lines from your script which are relevant for Windows. In fact, here are my code:

EnableRemoteCommands=0
LogRemoteCommands=0
Server=192.168.25.5
ListenPort=10050
ListenIP=192.168.25.35
StartAgents=3
ServerActive=192.168.25.5
Hostname=FileServer01
RefreshActiveChecks=120
BufferSend=5
BufferSize=100
MaxLinesPerSecond=100
Timeout=3

The following is the error I get:
9424:20180227:103015.423 active check configuration update from [192.168.25.5:10051] started to fail (cannot connect to [[192.168.25.5]:10051]: Connection refused.)

I have enabled 10051 IN and 10050 OUT ports in the server. similarly 10050 IN and 10051 OUT in the client...

[ntluan_gooner]

i got a same problem and i hope this help

Check your conf path:
/etc/zabbix/zabbix_agentd.conf

In my case , Zabbix agent log was:
....using configuration file: /etc/zabbix_agentd.conf

So be careful !

[ahkhan1990]

Hello Everyone I am having the same problem . Can anyone assist me? the machines are pinging each other but agent is not working. i tried every methd in this forum and other forum but still its same. Agent is installed in Windows Server 2022 machine with the server IP and server proxy 127.0.0.1 default. I am using PSK key but still its givign me same error.

[MRedbourne]

Hello Everyone I am having the same problem . Can anyone assist me? the machines are pinging each other but agent is not working. i tried every methd in this forum and other forum but still its same. Agent is installed in Windows Server 2022 machine with the server IP and server proxy 127.0.0.1 default. I am using PSK key but still its givign me same error.

Can you telnet to the 10051 port on the proxy? Alternatively, what happens if you scan it with nmap?

Telnet Option > telnet <Proxy IP> 10051
nmap Option > nmap -p 10051 -Pn <Proxy IP>

If they return closed, there's likely a firewall in the way. Can be the source, a perimeter firewall (Eg: Cisco, Fortinet, etc) or the destination host blocking the connection.

Which version of Zabbix (Server/Proxy) are you using?
Which OS and Version runs Zabbix Server/Proxy?

[cyber]

127.0.0.1 is localhost... if you want your agent to connect to server/proxy, put its address there instead of localhost...

[ahkhan1990]

still the same issue .and I see that 10050 is listening but 10051 is not. and both ports are open. Zabbix server and agent machine is also pinging

[ahkhan1990]

Can you telnet to the 10051 port on the proxy? Alternatively, what happens if you scan it with nmap?

Telnet Option > telnet <Proxy IP> 10051
nmap Option > nmap -p 10051 -Pn <Proxy IP>

If they return closed, there's likely a firewall in the way. Can be the source, a perimeter firewall (Eg: Cisco, Fortinet, etc) or the destination host blocking the connection.

Which version of Zabbix (Server/Proxy) are you using?
Which OS and Version runs Zabbix Server/Proxy?

Hey I tried but still not working. getting the same error.

[ahkhan1990]

127.0.0.1 is localhost... if you want your agent to connect to server/proxy, put its address there instead of localhost...

still the same issue .and I see that 10050 is listening but 10051 is not. and both ports are open. Zabbix server and agent machine is also pinging

[cyber]

Listening where? 10050 is agent port, Server/proxy connects there in case of passive agent. 10051 is trapper port on server/proxy, agent connects there in case of active agent to ask for config updates and send away collected data...
Make sure you can connect from agent host to server/proxy:10051 and from server/proxy to agent host:10050. If you do not succeed, find the reason, for example verify FW rules, make sure you server/proxy processes are up and running etc...

[ahkhan1990]

Listening where? 10050 is agent port, Server/proxy connects there in case of passive agent. 10051 is trapper port on server/proxy, agent connects there in case of active agent to ask for config updates and send away collected data...
Make sure you can connect from agent host to server/proxy:10051 and from server/proxy to agent host:10050. If you do not succeed, find the reason, for example verify FW rules, make sure you server/proxy processes are up and running etc...

failed to process an incoming connection from 10.XX.XX:XX cannot accept unencrypted connection

[cyber]

failed to process an incoming connection from 10.XX.XX:XX cannot accept unencrypted connection

Agent?

Have you configured host in Zabbix GUI with all the encryption, but agent has no config?