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The vSphere HA agent is unreachableIn the Summary tab of the affected ESXi host, you see the error: vSphere HA reports that an agent is in the Agent Unreachable stateRestarting the management agents does not resolve the issueRestarting the Virtual Center service does not resolve the issue Follow this article for specific error vSphere HA agent for this host has an error. The vSphere HA agent is not reachable from vCenter server.
This issue occurs if there is a network problem that prevents vCenter Server from contacting the primary host and the agent on the host or if all hosts in the cluster have failed. This issue may also occur if the agent on the host has failed and the watchdog process is unable to restart it.
To resolve this issue: Determine if vCenter Server is reporting the host as Not Responding. For more information,see Diagnosing an ESX or ESXi host that is Disconnected or Not Responding in vCenter Server (1003409).If the host is in a Not Responding state, there is a network problem or a total cluster failure. After you resolve this condition, vSphere HA should configure correctly.If the vCenter Server reports the hosts as responding: Enable the SSH access to the host.Connect to the ESXi host using SSH.Review the /var/log/vpxa.log file and check if there are errors related to communication with vCenter Server and the host Management Agent (hostd).Review the /var/log/fdm.log file (Fault Domain Manager log) and check if there are errors related to vSphere High Availability. For more information, see the vSphere Availability Guide Right-click the affected host and click Reconfigure for vSphere HA. For additional troubleshooting information, see: Guidelines for Troubleshooting
For more information, see: Error: "vSphere HA agent cannot be correctly installed or configured" For translated version of this article, see: 无法访问 vSphere HA 代理且 ESXi 主机的“摘要”选项卡报告以下错误：vSphere HA 报告一个代理处于“无法访问代理”状态
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