--- title: "ZKBio Time.Net Device Offline or Keeps Disconnecting | Qyvea" url: https://qyvea.co.ke/zkbio-time-net-device-offline-keeps-disconnecting description: "Why a ZKTeco K40 Pro shows offline in ZKBio Time.Net, drops out every few hours or works only after a restart. Causes and permanent fixes." updated: 2026-10-20 --- > Markdown copy of https://qyvea.co.ke/zkbio-time-net-device-offline-keeps-disconnecting for AI assistants. Prices and stock change; check the live page. 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Intermittent faults are about the network, rarely the terminal. [Shop ZKTeco K40 terminals →](https://qyvea.co.ke/products/zkteco-k40-fingerprint-time-attendance-terminal-67)[Get help on WhatsApp](https://wa.me/254113301244?text=Hi%20Qyvea%2C%20I%20read%20your%20guide%3A%20ZKBio%20Time.Net%3A%20Device%20Offline%20or%20Keeps%20Disconnecting.%20I%20need%20help%20with%20my%20ZKTeco%20K40%20Pro.) Quick answer Give the terminal a fixed or reserved IP, check for duplicate addresses, replace the network cable and switch port, fit a UPS, and make sure sleeping PC settings do not drop the connection. **Buy your ZKTeco K40 from Qyvea**: Supplied and installed across Kenya. Delivered within 24 hours once payment is confirmed. [Shop ZKTeco K40 terminals →](https://qyvea.co.ke/products/zkteco-k40-fingerprint-time-attendance-terminal-67)[All attendance terminals](https://qyvea.co.ke/products?cat=biometrics&search=attendance)[Ask Qyvea on WhatsApp](https://wa.me/254113301244?text=Hi%20Qyvea%2C%20I%20read%20your%20guide%3A%20ZKBio%20Time.Net%3A%20Device%20Offline%20or%20Keeps%20Disconnecting.%20I%20need%20help%20with%20a%20ZKTeco%20K40%20Pro.%20Please%20quote%20me.) ## Key takeaways - Use a fixed or reserved IP. - Rule out duplicates. - Replace cables and switch ports. - Stop the PC sleeping or hibernating. ## DHCP changes the IP If the terminal gets its IP automatically, a router restart can give it a new one and the software loses it. Set a fixed IP or reserve one in the router. See [set the IP](https://qyvea.co.ke/zkteco-k40-pro-set-ip-address). ## Duplicate address A laptop or phone taking the same IP causes drop-outs. See [IP conflict](https://qyvea.co.ke/zkteco-k40-pro-ip-conflict). ## Cable and switch - Swap the network cable. - Try another switch port. - Avoid long cable runs near mains cables. - Replace cheap switches that hang. ## Power Brownouts reboot the terminal and drop the link. A small UPS fixes it. See [power backup](https://qyvea.co.ke/zkteco-k40-pro-power-backup-ups-kenya). ## PC settings - Set the PC to never sleep while attendance runs. - Let the PC wake on LAN or stay on. - Disable power saving on the network adapter. ## Monitor it Run a continuous ping to the device for an hour. Drops in the ping show the network is at fault, not the software. ## A typical scenario A warehouse terminal dropped every afternoon. A continuous ping showed packets lost when the generator switched on. Moving the switch onto a UPS and replacing the cheap cable solved it. *Illustrative example based on common cases, not a named customer.* ## Common mistakes - Blaming the software first. - Using Wi-Fi for a fixed terminal. - Ignoring power quality. - No fixed IP. - Cheap unmanaged switches shared with cameras. ## Quick checklist 1. Fixed IP 2. No duplicates 3. Cable and port swapped 4. UPS 5. PC power settings 6. Continuous ping test ## Frequently asked questions The terminal works but the software shows offline. Why? The software may not be refreshed, or the Comm Key or port changed. Reconnect and test. Does Wi-Fi cause this? Wireless links drop more than cable. Use cable where possible. Does a bad time zone cause offline? No. Wrong time affects punches, not connectivity. Will Qyvea fix it? Yes, we diagnose network and device issues across Kenya. This guide is part of our [ZKTeco K40 and ZKBio Time.Net series](https://qyvea.co.ke/zkteco-k40-zkbio-time-net-guides-kenya). For the full start-to-finish walkthrough with screenshots, read [How to Configure a ZKTeco K40 Pro with ZKBio Time.Net](https://qyvea.co.ke/how-to-configure-zkteco-k40-pro-zkbio-time-net). ZKTeco and ZKBio are trademarks of ZKTeco Inc. Menu names on the K40 Pro and in the software vary slightly by firmware and software version; where yours differ, look for the nearest match. Qyvea is a ZKTeco reseller and installer in Kenya. **Want us to do this for you?**: We supply, install, configure the software, enrol your staff and train your HR team. [Shop ZKTeco K40 terminals →](https://qyvea.co.ke/products/zkteco-k40-fingerprint-time-attendance-terminal-67)[All attendance terminals](https://qyvea.co.ke/products?cat=biometrics&search=attendance)[Ask Qyvea on WhatsApp](https://wa.me/254113301244?text=Hi%20Qyvea%2C%20I%20read%20your%20guide%3A%20ZKBio%20Time.Net%3A%20Device%20Offline%20or%20Keeps%20Disconnecting.%20I%20need%20help%20with%20a%20ZKTeco%20K40%20Pro.%20Please%20quote%20me.) ## Why customers choose Qyvea **Genuine brands**: Manufacturer warranty on what we sell, so you are not gambling on the box. **One team, start to finish**: The people who advise you also install and support it. **Fast answers**: WhatsApp replies usually within 30 minutes, and delivery within 24 hours in Nairobi. **Easy to buy**: Pay by M-Pesa, bank transfer or card. Free delivery in Nairobi on orders over KES 5,000. **Risk taken off you**: 7-day returns and exchanges on products, and a workmanship warranty on installations. **Customers say so**: Rated 4.6/5 from 57 Google reviews. **Your next step takes one minute:** send us a photo of the place on WhatsApp and we will tell you what it needs. ## Related articles [Biometrics & Attendance · Troubleshooting ZKBio Time.Net: No Records Downloaded From the Terminal Find out why Get Transaction shows nothing and recover the punches. 2 min read**READ FULL ARTICLE →**](https://qyvea.co.ke/zkbio-time-net-no-records-downloaded)[Biometrics & Attendance · Troubleshooting ZKBio Time.Net: Duplicate or Mismatched Employee ID Find and fix mismatched IDs between the terminal and the software. 2 min read**READ FULL ARTICLE →**](https://qyvea.co.ke/zkbio-time-net-duplicate-employee-id)[Biometrics & Attendance · Guide ZKTeco K40 Pro vs F18: Attendance Clock or Door Access? Pick by job: record attendance only, or also open a door. 2 min read**READ FULL ARTICLE →**](https://qyvea.co.ke/zkteco-k40-pro-vs-f18) ### Related guides [All ZKTeco K40 and ZKBio guides](https://qyvea.co.ke/zkteco-k40-zkbio-time-net-guides-kenya)[Configure a K40 Pro with ZKBio Time.Net](https://qyvea.co.ke/how-to-configure-zkteco-k40-pro-zkbio-time-net)[Use ZKTeco attendance software](https://qyvea.co.ke/how-to-use-zkteco-attendance-software) ### Related products [ZKTeco K40 terminal](https://qyvea.co.ke/products/zkteco-k40-fingerprint-time-attendance-terminal-67)[ZKTeco K40 price in Kenya](https://qyvea.co.ke/zkteco-k40-price-in-kenya)[ZKTeco attendance machines](https://qyvea.co.ke/zkteco-attendance-machine-price-in-kenya) ### Related services [Biometrics & attendance](https://qyvea.co.ke/biometrics)[Biometric attendance systems](https://qyvea.co.ke/biometric-attendance-systems-kenya) [← Previous**ZKBio Time.Net: 'Connect to Terminal Failed'. 8 Fixes That Work**](https://qyvea.co.ke/zkbio-time-net-connect-to-terminal-failed)[Next →**: ZKTeco K40 Pro IP Address Conflict: How to Find and Fix It**](https://qyvea.co.ke/zkteco-k40-pro-ip-conflict) ## Need this system installed? Talk to Qyvea. We design, install and maintain it. Chat with us — 30 min response --- **Qyvea Limited** · Westlands, Nairobi, Kenya (delivery only, no walk-in pickup) · serving all 47 counties Phone/WhatsApp: [+254 113 301 244](https://wa.me/254113301244) · Email: info@qyvea.co.ke · Shop: [qyvea.co.ke/products](https://qyvea.co.ke/products) · Facts: [qyvea.co.ke/qyvea-facts](https://qyvea.co.ke/qyvea-facts)