ESXi host offline and logs report fnic errors
Article ID: 432827
Updated On:
Products
VMware vSphere ESXi
Issue/Introduction
One or more ESXi hosts show as "disconnected" in vCenter Server. The following facts apply to this issue:
- Cisco UCS blades are in use as ESXi hosts
- UCS Manager reports link down errors for the affected blade(s)
- On the ESXi host, the vmkernel log reports error loglines as follows:
2026-03-03T19:06:44.757Z Wa(180) vmkwarning: cpu90:#######)WARNING: nfnic: <1>: fnic_fw_reset_handler: 312: Issued fw reset
- Additionally, the following logline can also be seen in the vmkernel log:
2026-03-02T21:56:26.248Z Wa(180) vmkwarning: cpu44:#######)WARNING: nenic: _vnic_dev_cmd2:365: 0000:62:00.3:Timed out devcmd 4
Environment
VMware ESXi
Cause
This issue is caused as a result of underlying hardware issues.
Resolution
Contact the hardware vendor for further troubleshooting.
Additional Information
Feedback
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