| Problem | Cause | Best Fix | |---------|-------|----------| | Server won’t wake after UPS shutdown | NIC lost WoL config in S5 | Use Intel/Broadcom NIC; disable "Energy Efficient Ethernet" | | APC cuts USB power before WoL works | USB serial chip depowers NIC | Switch to NMC or serial (RS-232) connection | | Server wakes randomly | Broadcast WoL packets | Enable "Secure WoL" with password or directed packet only | | Dual PSU servers | Second PSU on different UPS | Connect both UPS to same output group or use single PSU for WoL |
Use ping or a port check in your script to confirm the device is actually offline before blasting WoL packets. No need to wake an already-running server. apc ups wake on lan best
: Use a secondary low-power device (like a Raspberry Pi) always connected to power to send the "Magic Packet" to your main server once the UPS confirms the mains are back. Recommended APC Tools NMC 'Wake on LAN' support - Schneider Electric Community 30 Jun 2021 — | Problem | Cause | Best Fix |
is the "magic packet" sent over your local network to turn that PC back on once power is restored and stable. 2. Best APC Setup for WoL Compatibility Recommended APC Tools NMC 'Wake on LAN' support