Received empty response from Zabbix Agent at [X.X.X.X]. Assuming that agent dropped connection because of...











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I have a Zabbix configuration problem here in the company a few days ago. I'm having this error on the hosts page in the Settings portion. I have already done several tests, being:




  1. Agent and Server Ports Release (Firewall Disabled)

  2. I changed the settings of agent.config and server.config.

  3. I disabled SELINUX.


Agent and Server Ports Release (Firewall Disabled)
I changed the settings of agent.config and server.config.
I disabled SELINUX.
If you can help me thank you, I only need this communication so I can proceed with the finalization of the installation.




Error: Received empty response from Zabbix Agent at [X.X.X.X].
Assuming that agent dropped connection because of access permissions.




I already looked for solutions in google but I did not find answers



UPDATE: I noticed that the server apparently has some network problem. I have managed to install normal zabbix using yum in Centos 7. However, the server is taking too long to ping google.com and is missing the settings in the resolv.conf file.



I do not know what this network problem can be, I'm a beginner in linux and I'm having a bit of trouble correcting this without having to configure a new server.



UPDATE 2: I identified that the server did not contain the google DNS (8.8.8.8) configured in: /etc/sysconfig/network-scripts/ifcfg-eth0 so I added this registry and it solved the network problem, now it's ping google.com , before of this was only the internal DNS of the company. But the initial problem still persists and I think there may be some relationship with network configurations



Configs: SERVER CONFIG, AGENT CONFIG










share|improve this question


























    up vote
    0
    down vote

    favorite












    I have a Zabbix configuration problem here in the company a few days ago. I'm having this error on the hosts page in the Settings portion. I have already done several tests, being:




    1. Agent and Server Ports Release (Firewall Disabled)

    2. I changed the settings of agent.config and server.config.

    3. I disabled SELINUX.


    Agent and Server Ports Release (Firewall Disabled)
    I changed the settings of agent.config and server.config.
    I disabled SELINUX.
    If you can help me thank you, I only need this communication so I can proceed with the finalization of the installation.




    Error: Received empty response from Zabbix Agent at [X.X.X.X].
    Assuming that agent dropped connection because of access permissions.




    I already looked for solutions in google but I did not find answers



    UPDATE: I noticed that the server apparently has some network problem. I have managed to install normal zabbix using yum in Centos 7. However, the server is taking too long to ping google.com and is missing the settings in the resolv.conf file.



    I do not know what this network problem can be, I'm a beginner in linux and I'm having a bit of trouble correcting this without having to configure a new server.



    UPDATE 2: I identified that the server did not contain the google DNS (8.8.8.8) configured in: /etc/sysconfig/network-scripts/ifcfg-eth0 so I added this registry and it solved the network problem, now it's ping google.com , before of this was only the internal DNS of the company. But the initial problem still persists and I think there may be some relationship with network configurations



    Configs: SERVER CONFIG, AGENT CONFIG










    share|improve this question
























      up vote
      0
      down vote

      favorite









      up vote
      0
      down vote

      favorite











      I have a Zabbix configuration problem here in the company a few days ago. I'm having this error on the hosts page in the Settings portion. I have already done several tests, being:




      1. Agent and Server Ports Release (Firewall Disabled)

      2. I changed the settings of agent.config and server.config.

      3. I disabled SELINUX.


      Agent and Server Ports Release (Firewall Disabled)
      I changed the settings of agent.config and server.config.
      I disabled SELINUX.
      If you can help me thank you, I only need this communication so I can proceed with the finalization of the installation.




      Error: Received empty response from Zabbix Agent at [X.X.X.X].
      Assuming that agent dropped connection because of access permissions.




      I already looked for solutions in google but I did not find answers



      UPDATE: I noticed that the server apparently has some network problem. I have managed to install normal zabbix using yum in Centos 7. However, the server is taking too long to ping google.com and is missing the settings in the resolv.conf file.



      I do not know what this network problem can be, I'm a beginner in linux and I'm having a bit of trouble correcting this without having to configure a new server.



      UPDATE 2: I identified that the server did not contain the google DNS (8.8.8.8) configured in: /etc/sysconfig/network-scripts/ifcfg-eth0 so I added this registry and it solved the network problem, now it's ping google.com , before of this was only the internal DNS of the company. But the initial problem still persists and I think there may be some relationship with network configurations



      Configs: SERVER CONFIG, AGENT CONFIG










      share|improve this question













      I have a Zabbix configuration problem here in the company a few days ago. I'm having this error on the hosts page in the Settings portion. I have already done several tests, being:




      1. Agent and Server Ports Release (Firewall Disabled)

      2. I changed the settings of agent.config and server.config.

      3. I disabled SELINUX.


      Agent and Server Ports Release (Firewall Disabled)
      I changed the settings of agent.config and server.config.
      I disabled SELINUX.
      If you can help me thank you, I only need this communication so I can proceed with the finalization of the installation.




      Error: Received empty response from Zabbix Agent at [X.X.X.X].
      Assuming that agent dropped connection because of access permissions.




      I already looked for solutions in google but I did not find answers



      UPDATE: I noticed that the server apparently has some network problem. I have managed to install normal zabbix using yum in Centos 7. However, the server is taking too long to ping google.com and is missing the settings in the resolv.conf file.



      I do not know what this network problem can be, I'm a beginner in linux and I'm having a bit of trouble correcting this without having to configure a new server.



      UPDATE 2: I identified that the server did not contain the google DNS (8.8.8.8) configured in: /etc/sysconfig/network-scripts/ifcfg-eth0 so I added this registry and it solved the network problem, now it's ping google.com , before of this was only the internal DNS of the company. But the initial problem still persists and I think there may be some relationship with network configurations



      Configs: SERVER CONFIG, AGENT CONFIG







      centos-7 zabbix






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 30 at 18:09









      Luis Fernando

      33




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          2 Answers
          2






          active

          oldest

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          up vote
          0
          down vote



          accepted










          Zabbix agent configuration file must allow connections from the server - see the Server configuration parameter.



          In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.






          share|improve this answer























          • Your answer did not help much, I already checked these settings, could be more specific?
            – Luis Fernando
            Nov 30 at 19:08










          • Please describe in detail what exactly you checked, and what was observed. If that does not highlight the cause, consider increasing agent log level - then it will print messages about incoming connections, including the IP address it sees. You might have a misconfiguration, unexpected outgoing IP or NAT, among other possible causes.
            – Richlv
            Dec 2 at 14:56










          • So, I checked the port settings on windows, I got to disable the firewall and Kaspersky that was running. In addition, I noticed that when I telnet from port 10050 from the server to the agent it connects but then returns the message: "Connection closed by foreign host." next, I disabled Firewalld in CENTOS 7 and confirmed the SELINUX disabled again. The agent log has the following information: Agentd log
            – Luis Fernando
            Dec 3 at 16:05










          • In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.
            – Richlv
            Dec 3 at 20:16










          • Hello, I was able to resolve adjusting version of Agent with that of Server, they really were different. Although I managed to resolve before your response, I approved of it being correct. Thanks a lot for the help!
            – Luis Fernando
            Dec 5 at 11:24


















          up vote
          -1
          down vote













          This error is not a permission error or a server side error. this one related to network hops, First enable debug level in your zabbix agent conf, nano /etc/zabbix/zabbix_agentd.conf UN-comment this line and change it to number 4 Debug Level=4 then restart your agent service tail the log file tail -f /var/log/zabbix/zabbix_agentd.log if your log shows any rejected IP hop, you need to white-list that IP on your agent conf file in two places. server=zabbixserverIP,LasthopIP ServerActive=zabbixserverIP,LasthopIP



          in this case main thing is, in your zabbix serverIP range what is the first network hop in your routing, that IP you need to white-list.



          Thank you.






          share|improve this answer








          New contributor




          user970609 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.


















          • That's not entirely correct, and listing multiple addresses when only one would be needed could be adding to the confusion.
            – Richlv
            Dec 6 at 18:45











          Your Answer








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          2 Answers
          2






          active

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          2 Answers
          2






          active

          oldest

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          active

          oldest

          votes






          active

          oldest

          votes








          up vote
          0
          down vote



          accepted










          Zabbix agent configuration file must allow connections from the server - see the Server configuration parameter.



          In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.






          share|improve this answer























          • Your answer did not help much, I already checked these settings, could be more specific?
            – Luis Fernando
            Nov 30 at 19:08










          • Please describe in detail what exactly you checked, and what was observed. If that does not highlight the cause, consider increasing agent log level - then it will print messages about incoming connections, including the IP address it sees. You might have a misconfiguration, unexpected outgoing IP or NAT, among other possible causes.
            – Richlv
            Dec 2 at 14:56










          • So, I checked the port settings on windows, I got to disable the firewall and Kaspersky that was running. In addition, I noticed that when I telnet from port 10050 from the server to the agent it connects but then returns the message: "Connection closed by foreign host." next, I disabled Firewalld in CENTOS 7 and confirmed the SELINUX disabled again. The agent log has the following information: Agentd log
            – Luis Fernando
            Dec 3 at 16:05










          • In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.
            – Richlv
            Dec 3 at 20:16










          • Hello, I was able to resolve adjusting version of Agent with that of Server, they really were different. Although I managed to resolve before your response, I approved of it being correct. Thanks a lot for the help!
            – Luis Fernando
            Dec 5 at 11:24















          up vote
          0
          down vote



          accepted










          Zabbix agent configuration file must allow connections from the server - see the Server configuration parameter.



          In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.






          share|improve this answer























          • Your answer did not help much, I already checked these settings, could be more specific?
            – Luis Fernando
            Nov 30 at 19:08










          • Please describe in detail what exactly you checked, and what was observed. If that does not highlight the cause, consider increasing agent log level - then it will print messages about incoming connections, including the IP address it sees. You might have a misconfiguration, unexpected outgoing IP or NAT, among other possible causes.
            – Richlv
            Dec 2 at 14:56










          • So, I checked the port settings on windows, I got to disable the firewall and Kaspersky that was running. In addition, I noticed that when I telnet from port 10050 from the server to the agent it connects but then returns the message: "Connection closed by foreign host." next, I disabled Firewalld in CENTOS 7 and confirmed the SELINUX disabled again. The agent log has the following information: Agentd log
            – Luis Fernando
            Dec 3 at 16:05










          • In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.
            – Richlv
            Dec 3 at 20:16










          • Hello, I was able to resolve adjusting version of Agent with that of Server, they really were different. Although I managed to resolve before your response, I approved of it being correct. Thanks a lot for the help!
            – Luis Fernando
            Dec 5 at 11:24













          up vote
          0
          down vote



          accepted







          up vote
          0
          down vote



          accepted






          Zabbix agent configuration file must allow connections from the server - see the Server configuration parameter.



          In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.






          share|improve this answer














          Zabbix agent configuration file must allow connections from the server - see the Server configuration parameter.



          In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.







          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Dec 3 at 20:17

























          answered Nov 30 at 18:39









          Richlv

          20219




          20219












          • Your answer did not help much, I already checked these settings, could be more specific?
            – Luis Fernando
            Nov 30 at 19:08










          • Please describe in detail what exactly you checked, and what was observed. If that does not highlight the cause, consider increasing agent log level - then it will print messages about incoming connections, including the IP address it sees. You might have a misconfiguration, unexpected outgoing IP or NAT, among other possible causes.
            – Richlv
            Dec 2 at 14:56










          • So, I checked the port settings on windows, I got to disable the firewall and Kaspersky that was running. In addition, I noticed that when I telnet from port 10050 from the server to the agent it connects but then returns the message: "Connection closed by foreign host." next, I disabled Firewalld in CENTOS 7 and confirmed the SELINUX disabled again. The agent log has the following information: Agentd log
            – Luis Fernando
            Dec 3 at 16:05










          • In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.
            – Richlv
            Dec 3 at 20:16










          • Hello, I was able to resolve adjusting version of Agent with that of Server, they really were different. Although I managed to resolve before your response, I approved of it being correct. Thanks a lot for the help!
            – Luis Fernando
            Dec 5 at 11:24


















          • Your answer did not help much, I already checked these settings, could be more specific?
            – Luis Fernando
            Nov 30 at 19:08










          • Please describe in detail what exactly you checked, and what was observed. If that does not highlight the cause, consider increasing agent log level - then it will print messages about incoming connections, including the IP address it sees. You might have a misconfiguration, unexpected outgoing IP or NAT, among other possible causes.
            – Richlv
            Dec 2 at 14:56










          • So, I checked the port settings on windows, I got to disable the firewall and Kaspersky that was running. In addition, I noticed that when I telnet from port 10050 from the server to the agent it connects but then returns the message: "Connection closed by foreign host." next, I disabled Firewalld in CENTOS 7 and confirmed the SELINUX disabled again. The agent log has the following information: Agentd log
            – Luis Fernando
            Dec 3 at 16:05










          • In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.
            – Richlv
            Dec 3 at 20:16










          • Hello, I was able to resolve adjusting version of Agent with that of Server, they really were different. Although I managed to resolve before your response, I approved of it being correct. Thanks a lot for the help!
            – Luis Fernando
            Dec 5 at 11:24
















          Your answer did not help much, I already checked these settings, could be more specific?
          – Luis Fernando
          Nov 30 at 19:08




          Your answer did not help much, I already checked these settings, could be more specific?
          – Luis Fernando
          Nov 30 at 19:08












          Please describe in detail what exactly you checked, and what was observed. If that does not highlight the cause, consider increasing agent log level - then it will print messages about incoming connections, including the IP address it sees. You might have a misconfiguration, unexpected outgoing IP or NAT, among other possible causes.
          – Richlv
          Dec 2 at 14:56




          Please describe in detail what exactly you checked, and what was observed. If that does not highlight the cause, consider increasing agent log level - then it will print messages about incoming connections, including the IP address it sees. You might have a misconfiguration, unexpected outgoing IP or NAT, among other possible causes.
          – Richlv
          Dec 2 at 14:56












          So, I checked the port settings on windows, I got to disable the firewall and Kaspersky that was running. In addition, I noticed that when I telnet from port 10050 from the server to the agent it connects but then returns the message: "Connection closed by foreign host." next, I disabled Firewalld in CENTOS 7 and confirmed the SELINUX disabled again. The agent log has the following information: Agentd log
          – Luis Fernando
          Dec 3 at 16:05




          So, I checked the port settings on windows, I got to disable the firewall and Kaspersky that was running. In addition, I noticed that when I telnet from port 10050 from the server to the agent it connects but then returns the message: "Connection closed by foreign host." next, I disabled Firewalld in CENTOS 7 and confirmed the SELINUX disabled again. The agent log has the following information: Agentd log
          – Luis Fernando
          Dec 3 at 16:05












          In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.
          – Richlv
          Dec 3 at 20:16




          In this particular case, your agent is more recent than the server (Message from ... is missing header). Try with an version agent that matches the server.
          – Richlv
          Dec 3 at 20:16












          Hello, I was able to resolve adjusting version of Agent with that of Server, they really were different. Although I managed to resolve before your response, I approved of it being correct. Thanks a lot for the help!
          – Luis Fernando
          Dec 5 at 11:24




          Hello, I was able to resolve adjusting version of Agent with that of Server, they really were different. Although I managed to resolve before your response, I approved of it being correct. Thanks a lot for the help!
          – Luis Fernando
          Dec 5 at 11:24












          up vote
          -1
          down vote













          This error is not a permission error or a server side error. this one related to network hops, First enable debug level in your zabbix agent conf, nano /etc/zabbix/zabbix_agentd.conf UN-comment this line and change it to number 4 Debug Level=4 then restart your agent service tail the log file tail -f /var/log/zabbix/zabbix_agentd.log if your log shows any rejected IP hop, you need to white-list that IP on your agent conf file in two places. server=zabbixserverIP,LasthopIP ServerActive=zabbixserverIP,LasthopIP



          in this case main thing is, in your zabbix serverIP range what is the first network hop in your routing, that IP you need to white-list.



          Thank you.






          share|improve this answer








          New contributor




          user970609 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.


















          • That's not entirely correct, and listing multiple addresses when only one would be needed could be adding to the confusion.
            – Richlv
            Dec 6 at 18:45















          up vote
          -1
          down vote













          This error is not a permission error or a server side error. this one related to network hops, First enable debug level in your zabbix agent conf, nano /etc/zabbix/zabbix_agentd.conf UN-comment this line and change it to number 4 Debug Level=4 then restart your agent service tail the log file tail -f /var/log/zabbix/zabbix_agentd.log if your log shows any rejected IP hop, you need to white-list that IP on your agent conf file in two places. server=zabbixserverIP,LasthopIP ServerActive=zabbixserverIP,LasthopIP



          in this case main thing is, in your zabbix serverIP range what is the first network hop in your routing, that IP you need to white-list.



          Thank you.






          share|improve this answer








          New contributor




          user970609 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.


















          • That's not entirely correct, and listing multiple addresses when only one would be needed could be adding to the confusion.
            – Richlv
            Dec 6 at 18:45













          up vote
          -1
          down vote










          up vote
          -1
          down vote









          This error is not a permission error or a server side error. this one related to network hops, First enable debug level in your zabbix agent conf, nano /etc/zabbix/zabbix_agentd.conf UN-comment this line and change it to number 4 Debug Level=4 then restart your agent service tail the log file tail -f /var/log/zabbix/zabbix_agentd.log if your log shows any rejected IP hop, you need to white-list that IP on your agent conf file in two places. server=zabbixserverIP,LasthopIP ServerActive=zabbixserverIP,LasthopIP



          in this case main thing is, in your zabbix serverIP range what is the first network hop in your routing, that IP you need to white-list.



          Thank you.






          share|improve this answer








          New contributor




          user970609 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          This error is not a permission error or a server side error. this one related to network hops, First enable debug level in your zabbix agent conf, nano /etc/zabbix/zabbix_agentd.conf UN-comment this line and change it to number 4 Debug Level=4 then restart your agent service tail the log file tail -f /var/log/zabbix/zabbix_agentd.log if your log shows any rejected IP hop, you need to white-list that IP on your agent conf file in two places. server=zabbixserverIP,LasthopIP ServerActive=zabbixserverIP,LasthopIP



          in this case main thing is, in your zabbix serverIP range what is the first network hop in your routing, that IP you need to white-list.



          Thank you.







          share|improve this answer








          New contributor




          user970609 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          share|improve this answer



          share|improve this answer






          New contributor




          user970609 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          answered Dec 6 at 17:11









          user970609

          1




          1




          New contributor




          user970609 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.





          New contributor





          user970609 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.






          user970609 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.












          • That's not entirely correct, and listing multiple addresses when only one would be needed could be adding to the confusion.
            – Richlv
            Dec 6 at 18:45


















          • That's not entirely correct, and listing multiple addresses when only one would be needed could be adding to the confusion.
            – Richlv
            Dec 6 at 18:45
















          That's not entirely correct, and listing multiple addresses when only one would be needed could be adding to the confusion.
          – Richlv
          Dec 6 at 18:45




          That's not entirely correct, and listing multiple addresses when only one would be needed could be adding to the confusion.
          – Richlv
          Dec 6 at 18:45


















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