Fix: Problems caused after installing Windows 10 Cumulative Update KB3201845

If after installing Cumulative Update KB3201845 on Windows 10, you cannot connect to the Internet, or are facing other issues then this post offers some insights on how to fix the issues. Although KB3201845 is expected to fix several bugs and improve performance, it is causing several problems. Some of the problems being mentioned by users after installing this update are:

Read: Why does every Windows 10 Update have to bring problems.

Microsoft has gone on record to state that several users have been facing problems connecting to the Internet after installing Windows 10 Cumulative Update KB3201845.  It has acknowledged the complaints of users and as a troubleshooting step has suggested them to resort to the old practice of restarting their PCs. Alternatively, it has advised to try and fix network connection issues.

Most users, when they visited Windows 10 Update History page, found the following banner displayed.

If you are experiencing issues connecting to the internet we recommend you restart your PC by going to Start, clicking the Power button, then choosing Restart (not Shut down).

Windows 10 Update KB3201845 issues

If you have not yet installed this update, you can temporarily block it using the Show or Hide Updates Tool. If you have installed it and are facing this issue, the following troubleshooting steps listed might help you fix the problem.

Cannot access Internet after installing Windows 10 Update KB3201845

1] Restart PC

Try restarting your PC and check if this fixes your connection problem. For this, click on the ‘Start’ button, chose ‘Power’ option and then, select ‘Restart’.

2] Run the Network Troubleshooter Followed by Networking Commands

The Network Troubleshooter is an essential tool for every network administrator. It can be used to troubleshoot a variety of different network conditions. You can help diagnose and fix common connection problems.

To run the Network troubleshooter, type Network troubleshooter in the search box on the taskbar and then select Identify and repair network problems from the list of results.

Then, follow the steps in the troubleshooter and see if that fixes the problem.

Read: Windows 10 cannot connect to Internet.

3] Update the network adapter driver

In most cases, the problem may arise due to an outdated or incompatible network adapter driver. In many cases, drivers designed for older versions of Windows will work just fine in newer versions. However, depending on the type of device, many hardware devices need a new driver to function properly on Microsoft’s latest operating system.

If you recently upgraded to Windows 10, it’s possible that the current driver was designed for a previous version of Windows. Just check to see if an updated version of the same driver is available.

For this, in the search box on the taskbar, type Device Manager, and then select Device Manager from the list of results. Then, under Device Manager, select Network adapters > the network adapter name.

Now, press and hold (or right-click) the network adapter, and then select Update Driver Software > Search automatically for updated driver software. Follow the steps on screen, then select Close.

Once you have installed an updated driver, select the Start button > Power > Restart if you’re asked to restart, and see if this fixes your problem.

Under situations where Windows fails to find a new driver for your network adapter, visit the PC manufacturer’s website and download the latest network adapter driver from there. If your PC can’t connect to the Internet, try downloading the driver on a different PC and save it to a USB flash drive, so you can manually install the driver on your PC. Important information you should look for any driver while downloading,

  1. PC manufacturer
  2. Model name or number

Read: How to Uninstall, Disable, Roll Back, Update Device Drivers

4] Roll Back the Network Adapter Driver

If you were connected before and recently installed a new network adapter driver, rolling back your driver to a previous version might help. To roll back to the old network adapter driver, type Device Manager in the search box on the taskbar, and then select Device Manager from the list of results.

In Device Manager, select Network adapters  > the network adapter name. Right-click the network adapter, and then select Properties. In Properties, select the Driver tab > Roll back driver, then follow the steps on-screen.

If the button is unavailable, it indicates, there’s no driver to roll back to.

After rolling back to the previous version of the driver, select the ‘Start’  button, chose Power option and select ‘Restart’ when prompted to restart.

5] Uninstall the Network Adapter Driver and Restart

If all of the above steps have failed to yield the desired results, try uninstalling the network adapter driver, and then restart your computer to have Windows automatically install the latest driver. Please note, this method should be resorted to when your network connection has stopped working properly after a recent update.

Type Device Manager in the search box on the taskbar and then select Device Manager from the list of results.

Then, under Device Manager category, select Network adapters and look for the network adapter name. When found, select it, right-click it and then select Uninstall option. Put a sign against ‘Delete the driver software for this device’ checkbox and chose OK to confirm your uninstall.

After uninstalling the driver, select the Start button, select Power and chose ‘Restart’ option.

After following the above procedure, when your PC restarts, Windows will automatically look for and install the network adapter driver. Check to see if that fixes your connection problem. If Windows doesn’t automatically install a driver, try to install the backup driver you saved earlier, before uninstalling.

6] Reset some settings

If this fails, try these as an alternative:

  1. Reset the TCP/IP stack
  2. Release the IP address
  3. Renew the IP address
  4. Flush and reset the DNS client resolver cache

For running these networking commands in a command prompt window, run the following commands in an elevated Command prompt:

netsh winsock reset
netsh int ip reset
ipconfig /release
ipconfig /renew
ipconfig /flushdns

7] Temporarily Turn off Firewall

In many cases, it is observed that firewall software sometimes might interfere with Internet connection settings and prevent you from getting connected. You can check if the connection issue is caused by a firewall by temporarily turning it off and then trying to visit a website you trust.

The steps required to turn off a Firewall depend on the firewall software you’re using. Not having a firewall turned on makes your PC more vulnerable to hackers, worms, or viruses so, make sure to turn it on as soon as you finish checking issues related to the firewall settings.

If you face trouble turning off your firewall, in an elevated command prompt, type the following, and then press Enter:

netsh advfirewall set allprofiles state off

Open your web browser and visit a website you trust and see if you can connect to it.

To turn on all firewalls you might have installed, at the command prompt, type this and press Enter.

netsh advfirewall set allprofiles state on

If you find the firewall software is causing the connection issues, contact the software manufacturer or visit their website to check and see if updated software is available.

8] Temporarily turn off any antivirus or security software

Although all the malware protection software and anti-virus systems are designed to avoid any unwanted threats sometimes, these might stop you from getting connected. You can verify if the connection issue is caused by antivirus software by turning it off temporarily and then trying to visit a website you trust.

9] Use Network Reset to reinstall Network Devices

Try the Network Reset feature. This should be used as your last resort. Consider using it when all other methods fail to get you connected.

This method can help solve connection problems you might have faced following an upgrade from a previous version of Windows to the latest version of Windows-Windows 10. The method works primarily by removing any network adapters you have installed and any settings that might be associated with them. After your PC restarts, any network adapters are reinstalled, and the settings for them are set to the defaults.

If you need advanced manual troubleshooting suggestions, Microsoft suggests the following:

10] Generate a Wireless Network Report

The report can help you diagnose the problem, or at least give you some relevant information that might help in getting the problem fixed. To generate a wireless network report, open an elevated CMD type the following and hit Enter:

netsh wlan show wlanreport.

This will generate an HTML file that you can easily open in your web browser from the location listed under the command prompt. You will then have to analyze the problems if any.

11] Check ISP

Make sure that there’s not any problem with your cable modem or Internet Service Provider (ISP). If, at all there is, contact your ISP. You can check this by typing the following in an elevated command prompt and hitting Enter:

ipconfig

Look for the IP address listed next to Default gateway. Type ping <DefaultGateway> and press Enter. For example, type ping 192.168.1.1 and press Enter.

The result should be something like this:

Reply from 192.168.1.1: bytes=32 time=5ms TTL=64

Reply from 192.168.1.1: bytes=32 time=5ms TTL=64

Reply from 192.168.1.1: bytes=32 time=5ms TTL=64

Reply from 192.168.1.1: bytes=32 time=5ms TTL=64

Ping statistics for 192.168.1.1: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 4ms, Maximum = 5ms, Average = 4ms

If all appears fine, close the window and exit.

If the ping is successful, and you see results similar to the results above, but can’t connect to the Internet on your PC, there may be a problem with your modem or Internet service provider (ISP).

If you are facing any other problems, you may search for it here. All the best!

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Anand Khanse is the Admin of TheWindowsClub.com, a 10-year Microsoft MVP Awardee in Windows & a Windows Insider MVP. Please read the entire post & the comments first, create a System Restore Point before making any changes to your system & be careful about any 3rd-party offers while installing freeware.