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NAS Not Working? Common Fixes (2026)
Fix the most common NAS problems: not visible on the network, slow transfers, unrecognized drives, and lost admin passwords.
Most NAS problems are network or configuration issues, not hardware failures. Work through these fixes in order before assuming a drive or enclosure has died.
NAS does not appear on the network
Check the link lights on the NAS Ethernet port and your switch, then find the NAS with the vendor's discovery tool (Synology Assistant, Qfinder Pro). If the NAS got a new DHCP address after a router reboot, reserve a static IP in your router settings to prevent repeats.
Transfers are much slower than expected
Verify you are on a wired connection; Wi-Fi rarely sustains NAS speeds. For 2.5GbE units, confirm the switch, cable (Cat 5e or better), and computer adapter all negotiate at 2.5G in the NAS network status page. Large numbers of small files always transfer slower than single large files.
A drive is not recognized or shows as degraded
Reseat the drive and check the vendor compatibility list for your exact model and firmware. If the array shows degraded, replace the failing drive promptly and let the rebuild complete before heavy use; a second failure during rebuild means data loss on non-mirrored arrays.
Locked out of the admin account
Use the hardware reset button procedure from your vendor's manual: a short press typically resets the admin password and network settings to DHCP without touching your data. A long press may reset more, so read the manual for your exact model first.
Questions, answered
Why did my NAS disappear after a power outage?
It likely received a new DHCP address when the router rebooted. Use the vendor discovery tool to find its new address, then set a DHCP reservation so it stays put.
Is it normal for the NAS to be loud during a RAID rebuild?
Yes. Rebuilds hammer every drive for hours, and fan speeds rise with temperature. Leave the NAS ventilated and undisturbed until the storage manager reports the array healthy.