Synology NAS is inaccessible, showing "No network access" or "Connection failed"

Workaround:

Scenario 1: Check the network + confirm the same LAN (highest priority)

1. confirm that the connection : the NAS power light is on, and the network cable is connected to the router LAN port
2. the same network : Make sure your computer and NAS are connected to the same router (same WiFi or the same wired network)
3. Check the router : Make sure the router's DHCP is normal, and you can see the NAS
   in the device list.
4. ping Test : Open the command prompt and enter ping 192.168.x.x (your NAS IP)

If you don't know the NAS IP, use Option 2

Solution 2: Find your NAS with Synology Assistant (highly recommended)

1. download the Synology Assistant on your computer (available on Synology's official website)
2. Open
   install and click "Search"
3. Once
   find the NAS, double-click to enter the login page
4. if it says "Not installed", skip to scenario five

• check if the firewall is blocking
• temporarily turn off your computer's firewall and try
• confirm that the network cable is working properly and the router is working properly

Scenario 3: Check the Hard Disk Status and Storage Pool

1. hear three long "drip-drip-drip" sounds from the NAS → hard drive failure
2. pause after hearing a "drop" → the system is normal, it could be a software issue
3. log in to DSM and go to the Control Panel → Storage Admin → HDD/SSD
4. check the status of the hard drive:
   1. normal → continue to troubleshoot the network
   2. Corrupted → Hard drives need to be replaced and the storage pool rebuilt

Do not forcibly shut down or unplug the hard disk when the storage pool is damaged

Option 4: Force Restart NAS

1. press and hold the power button for 4-5 seconds wait for a complete shutdown
2. wait 30 seconds
3. press the power button again to turn on
4. wait 2-3 minutes for the startup to complete

Frequent forced shutdown may damage the hard drive, do not use it unless necessary

Option 5: Reinstall DSM (Retention Data)

1. shutdown
2. press and hold the RESET key to turn on , wait for a beep sound, and then release it
3. NAS automatically enters Recovery mode
4. computer access find.synology.com or 192.168.1.1:5000
5. click Install → Select the downloaded DSM .pat_ file
6. wait for the installation to complete, data will not be lost!

Don't select "Clear Disk" when you first install DSM, otherwise your data will be lost

Scenario 6: Hard Drive Cloning/Data Recovery (Ultimate Solution)

1. remove the hard drive and connect it to another computer
2. use UFS Explorer or R-Studio for data recovery
3. or use DMDE to try to rebuild the RAID

This solution is time-consuming and may not be fully restored, so it is recommended to make backups regularly