I’ve got several computers connected to a local network via a Fritz Box 7390 router. There is no Windows Domain, Workgroup, or Homegroup, they are all just on the same sub net.
This works well on all devices except one. One computer (Lenovo Thinkpad L540, Intel Dual Band Wireless-N 7260 Adapter, Windows 10, current patch level) cannot connect to any other local computer using WiFi. It works when connecting with an ethernet cable. Connections to the internet work fine all the time.
While connected with WiFi, trying to access a network share results in a “Windows cannot access \OtherComputerName” message. The troubleshooting wizards found the issue: “Windows can communicate with the name resolution server but can't find the host name.”.
A simple Ping to the host name resolves the correct IP Address, but each Request Timed Out. This is true for all local IP Addresses except the address of the router/gateway itself.
If this computer is rebooted or I reset the IP configuration using
ipconfig /release followed by
ipconfig /renew everything works fine for about 30 to 90 seconds and then reverts back to the “broken state”.
There are 3 other computers with Windows 10 connecting with Wifi without any problem.
What I tried so far…
- Updated the driver of the Wireless Adapter to most recent version
- Uninstalled all network adapters in Device Manager and let Windows reinstall them
- Ran the network troubleshooting wizard. – No problem detected
- Temporarily switched off Windows Firewall
- Manually configured IPv4 settings instead of getting them by DHCP
- Temporarily changed the connection from Private to Public in Windows Network and Sharing Center
- I double checked that the router does not use any form of Wireless Isolation (Guest-Access-WiFi in Fritz Box router)
Nothing of the above made any difference to the problematic behavior.
On this PC there is just Windows Defender and Windows Firewall installed. No other security software.
What is causing this weird issue and how to fix it?