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Question

Zabbix agent unreachable during veeam backup time


I have a physical Zabbix server, which I’ve added to a Veeam Protection Group in order to back it up. I'm backing it up using the "Linux Agent" backup type. Recently, during the backup process, the Zabbix agent on that server becomes unreachable.

While the backup job is running, I receive continuous Telegram alerts indicating that all hosts in the infrastructure are unreachable. However, there are no actual issues in the environment — everything is functioning normally.

When I check the Zabbix server itself during the backup, the zabbix_agentd service appears to be active (running). Once the backup job finishes, the agent becomes reachable again and everything returns to normal.

I’ve been unable to find a solution to this issue anywhere. I would really appreciate any help or guidance on how to resolve this problem.

Thank you in advance!

2 comments

lukas.k
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  • Veeam Vanguard
  • 219 comments
  • April 9, 2025

Hi,

Maybe you can check the network load during the backup? You are using an Agent based backup which means that the actual backup workload is handled by the Agent installed on the Zabbix server, so the server takes the workload.

You can check the following:

Does Zabbix use ports that Veeam uses during the backup as well?

Does the network bottleneck / is the network at limit during the backup (which might lead to issues)?

 

Please find the default ports for Veeam here: Ports - Veeam Agent for Linux User Guide


Chris.Childerhose
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As mentioned by Lukas the agent does the processing on the server so that is more than likely the cause of the issue but if you are in doubt I would contact Support to ask them if there is a workaround.  If the server is doing to the processing from the agent then I can almost bet there is nothing that can be done for this issue.

 
 
 

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