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APC UPS Wake on LAN: A Comprehensive Guide

The Post-Shutdown WoL Trap

Once the server OS shuts down via PowerChute, it enters S5 (Soft Off) state. The NIC can still listen for WoL only if the motherboard has "Wake from S5" enabled in the BIOS. apc ups wake on lan best

5. The “Best” Working Sequence

1. Power fails → UPS on battery.
2. Runtime <120 seconds → APC PowerChute initiates OS shutdown.
3. OS enters S5 but NIC remains in WoL-listening state (thanks to #4.2 & 4.3).
4. UPS output remains off (servers have no AC, but they are already in S5).
5. Utility returns → UPS waits 180s (grid stable), then powers output.
6. Server gets AC → Motherboard power good, but stays in S5.
7. Management host sends magic packet (UDP 7 or 9) to server MAC.
8. Server boots → Full OS restart.

Phase 2: APC Software Configuration

• [ ] Install apcupsd (Linux) or PowerChute (Windows).
• [ ] Set shutdown delay to 300 seconds minimum (gives you time to intervene).
• [ ] Configure Low Battery Duration to 120 seconds (gives OS time to shut down gracefully).
• [ ] Set Return to Last Known State = "Turn On."

If you’re using an APC UPS to protect servers or critical PCs, combining it with Wake-on-LAN (WoL) ensures you can power on devices remotely after a controlled shutdown. Here are the best practices to make it work reliably: APC UPS Wake on LAN: A Comprehensive Guide

2. BIOS & NIC Configuration (Critical)

Use the "Restore on AC Power Loss" BIOS Setting: This is the most reliable "auto-wake" method. When the UPS restores power after an outage, your computer detects the AC current and automatically boots up. Power fails → UPS on battery

By combining APC UPS and Wake on LAN, you can enjoy the following benefits: