If your TP-Link Kasa smart plug keeps going offline, shows "unreachable" in the app, or won't stay connected, this guide covers the most common causes and fixes from the community.
Check WiFi Signal Strength (RSSI)
Weak WiFi signal is the most common cause of Kasa device disconnections.
Check signal strength in the Kasa app:
- Open the Kasa app
- Tap on your device
- Go to Device Settings → Device Info
- Look for RSSI (Received Signal Strength Indicator)
RSSI interpretation:
- -30 to -50 dBm: Excellent signal
- -50 to -60 dBm: Good signal
- -60 to -70 dBm: Fair signal (may cause occasional issues)
- -70 dBm or worse: Weak signal (disconnections likely)
TP-Link states: "If RSSI is less than -70dBm, the signal is too weak and device disconnections are likely. Relocate the smart device or router to get a stronger Wi-Fi signal."
2.4GHz WiFi Only
Kasa smart plugs only work on 2.4GHz networks. They cannot connect to 5GHz.
If your router broadcasts both on the same name:
- Create a separate 2.4GHz-only network SSID
- Connect the Kasa plug to that network
- This prevents the plug from trying to connect to 5GHz
One user reported: "The solution was separating my 2.4GHz and 5GHz networks. The smart plugs seem to only connect to the 2.4GHz network and disconnect when it's on 5GHz."
Router WiFi Channel Issues
Sometimes Kasa devices go offline due to WiFi channel interference or changes.
One user found: "After much investigation, all devices came back online after forcing the router to rescan Wi-Fi channels. It was odd because no other devices in the house were affected, only the TP-Link plugs. But a rescan of channels fixed it immediately."
Try these router adjustments:
- Manually set your 2.4GHz channel to 1, 6, or 11 (non-overlapping channels)
- Avoid "Auto" channel selection if you have frequent issues
- Check for interference from neighboring networks
Router Settings to Check
AP/Client Isolation:
If enabled, this prevents devices from communicating with each other on your network. Kasa plugs need this disabled.
DNS Settings:
TP-Link recommends changing your router's DNS to 8.8.8.8 and 8.8.4.4 (Google's DNS) if devices show online but can't be controlled.
Other settings:
- Disable "Smart Connect" or "Band Steering" temporarily
- Check that DHCP is working properly
- Ensure your router firmware is up to date
Reboot Everything
A simple reboot often fixes connectivity issues:
- Unplug the Kasa smart plug for 10 seconds
- Restart your router
- Wait for the router to fully boot (2-3 minutes)
- Plug the Kasa device back in
- Wait for it to reconnect (LED should turn solid)
Remove and Re-add Device
If the plug is stuck in a bad state:
- In the Kasa app, remove the device
- Factory reset the plug (see below)
- Add it again as a new device
Factory Reset the Plug
For most Kasa plugs (EP10, HS103, HS105, etc.):
- Plug the device in
- Press and hold the power button for about 5-10 seconds
- The LED will start blinking orange and green
- This indicates the plug is in setup mode
LED status meanings:
- Blinking orange/green: Ready for setup (config mode)
- Solid green or blue: Connected and working
- Blinking green: Connecting to WiFi
SmartThings Integration Issues
If your Kasa plug works in the Kasa app but shows offline in SmartThings:
- The plug itself is fine—this is an integration/cloud issue
- Try unlinking and relinking your Kasa account in SmartThings
- Check for Kasa or SmartThings app updates
- TP-Link cloud services occasionally have outages
One user reported: "Outlets that were previously linked and online on SmartHub suddenly showed as offline in the SmartThings app, even though the plug and lights were fine in the Kasa app."
Try a Different Phone
Some users report that the Kasa app has issues on certain devices:
- Try setting up from a different phone or tablet
- Ensure the Kasa app is updated to the latest version
- Clear the app cache and data, then try again
Check for Firmware Updates
- In the Kasa app, go to the device settings
- Check for firmware updates
- Install any available updates
- Keep the plug powered during the update
Multiple Plugs All Going Offline
If all your Kasa devices go offline at once:
- This is almost always a network issue, not the plugs
- Check your router and internet connection
- Restart your router
- Check if TP-Link/Kasa cloud services are down (rare)
- Rescan WiFi channels on your router
Assign Static IP Addresses
To prevent IP address changes that can cause disconnections:
- Find the plug's MAC address in Kasa app → Device Info
- In your router settings, create a DHCP reservation
- Assign a static IP to each Kasa device
- Restart the plug to apply
Community Discussions
- Kasa reporting all devices offline or unavailable – TP-Link Community
- What should I do if my Kasa device keeps losing connection? – TP-Link Support
- Kasa smart plugs "unreachable" with new WiFi router – TP-Link Community
- TP-Link Kasa Dropping Out? – SmartThings Community