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Win10 Shared Network Fails to Connect After Reboot

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At work I use Windows network sharing to give my laptop internet, but I found that after every machine reboot the shared network breaks — I have to cancel the sharing and share again. Doing this every morning is really tedious. Today I finally found a solution and share it here, hoping to help those who come after.

At work I use Windows network sharing to give my laptop internet, but I found that after every machine reboot the shared network breaks — I have to cancel the sharing and share the network again. Doing this every morning is really tedious. Today I finally found a solution and share it with everyone, hoping to help those who come after.

For configuring network sharing under Windows, see the other article: My office environment setup

The Problem Encountered

Let me first describe the problem I met. The following phenomena appear after every reboot of the Win10 machine:

Phenomena on my laptop:

  1. Cannot access the internet normally — even baidu.com won’t open.
  2. ping 192.168.137.1 works fine.
  3. Using wireshark to capture packets on the relevant NIC: all DNS requests get no response, while all ICMP requests return.
  4. telnet 192.168.137.1 3389 works — 3389 is the remote desktop port, and remote desktop also works normally.

Phenomena on the Win10 machine:

  1. All network access is normal
  2. The USBTP network interface keeps showing Unidentified network, but the IP configuration is normal (192.168.137.1)
  3. Using wireshark to capture USBTP NIC traffic: all DNS requests are not answered, all ICMP requests are answered.

Summarizing the phenomena above: only ICMP packets and TCP requests directly accessing Win10 got answers; all other requests were presumably lost. Or rather, the Win10 machine doesn’t process these requests (I guess there may be a problem with the routing table settings).

Basic Solution

The problem above was solved after I cancelled network sharing and re-shared the network. However, my Win10 computer reboots every day, and I have to connect to the Win10 computer after each reboot to do this operation — really annoying.

Root Solution

I searched the keywords windows 10 ics not working after reboot, and the pinned result was this guy’s ICS stops working after a reboot. Published 2018-12-29 — looks quite new.

ICS: Internet Connection Sharing — I only found this term after looking through many services in services.msc.

It introduces two ways to solve the problem:

  1. a powershell script to restart network sharing — basically scripting my previous operation
  2. modifying the registry:
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    Path: HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\SharedAccess
    Type: DWORD
    Setting: EnableRebootPersistConnection
    Value: 1

Thanks to him, I also saw Microsoft’s official blog: ICS doesn’t work after computer or service restart on Windows 10

After the modification, the picture is as follows:

Reboot the computer, and you’ll find everything is so beautiful.

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