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CrowdStrike Falcon provides cutting-edge endpoint protection to defend against malware, ransomware, and other types of cyber threats. However, if CrowdStrike Falcon is not working on your computer, it can leave your system vulnerable. Fortunately, most issues with CrowdStrike Falcon can be resolved with a few simple troubleshooting steps. In this guide, we will walk you through a series of steps to fix CrowdStrike not working on your computer, whether you're using Windows, Mac, or Linux.

Step 1: Verify If CrowdStrike Falcon is Installed

First, ensure that CrowdStrike Falcon is properly installed on your computer. If the sensor is missing or uninstalled, it will not work.

  1. Windows:

    • Go to Control Panel > Programs > Programs and Features.
    • Look for CrowdStrike Falcon in the list of installed applications.
    • If it’s missing, download and reinstall the Falcon sensor from the official CrowdStrike portal or your IT department.

  2. Mac:

    • Open Finder and go to Applications.
    • Check if CrowdStrike Falcon is listed. If not, you will need to reinstall it.

  3. Linux:

    • Open a terminal window and check if the Falcon sensor is installed by running:
    • If you don’t see the Falcon sensor, reinstall it using the correct installation procedure for your Linux distribution.

Step 2: Check the Status of the Falcon Sensor

If CrowdStrike Falcon is installed but not working, it could be that the sensor is not running. You will need to check if the CrowdStrike Falcon service is active and running on your system.

  1. Windows:

    • Press Win + R, type services.msc, and hit Enter.
    • In the Services window, find CrowdStrike Falcon Service or csfalconservice.
    • If the service is not running, right-click on it and choose Start. If it’s already running, try restarting it by right-clicking and selecting Restart.

  2. Mac:

    • Open Activity Monitor (found in Applications > Utilities).
    • Look for processes with "falcon" in the name (e.g., csfalconservice).
    • If the processes are not running, open Finder, go to Applications, and launch the CrowdStrike Falcon app again.

  3. Linux:

    • Open a terminal window and run the following command to check the sensor status:
    • If the sensor is not active, restart the service with:

Step 3: Restart Your Computer

Sometimes, a simple restart can resolve the issue. Restarting your computer will ensure that any system processes that may have been interfering with CrowdStrike Falcon are reset.

  1. Windows:

    • Click on the Start Menu and select Restart.

  2. Mac:

    • Go to the Apple Menu and select Restart.

  3. Linux:

    • Use the following command in the terminal to restart your Linux system:

After restarting your computer, check if CrowdStrike Falcon is functioning correctly.

Step 4: Ensure CrowdStrike Has the Necessary Permissions

CrowdStrike Falcon requires specific system permissions to function. If it doesn't have the necessary permissions, it may fail to run properly.

  1. Windows:

    • Ensure CrowdStrike Falcon is added to the Exclusions list in your antivirus or firewall (if any).
    • Check that Windows Defender is not conflicting with Falcon by going to Settings > Privacy & Security > Windows Security > Virus & Threat Protection and disabling any conflicting real-time protection features.

  2. Mac:

    • Open System Preferences > Security & Privacy.
    • Under the Privacy tab, ensure that CrowdStrike Falcon has the necessary permissions, such as Full Disk Access and Accessibility.
    • If CrowdStrike is not listed, click the "+" button to add it.

  3. Linux:

    • Make sure SELinux or AppArmor is not blocking the sensor. You may need to temporarily set SELinux to permissive mode to see if that resolves the issue:

Step 5: Check for Software Conflicts

Running other antivirus or security software alongside CrowdStrike Falcon can cause conflicts. To check if this is the issue, temporarily disable other security software to see if the Falcon sensor starts working.

  1. Windows:

    • If you have Windows Defender or another antivirus program running, disable it temporarily.
    • To disable Windows Defender:
      • Go to Settings > Privacy & Security > Windows Security.
      • Under Virus & Threat Protection, click on Manage Settings, and turn off Real-time protection.
    • Check if CrowdStrike Falcon works after disabling other security software.

  2. Mac:

    • If you have another antivirus installed, temporarily disable it and see if CrowdStrike Falcon functions.

  3. Linux:

    • If you are using any other security tools, disable them temporarily to test if they are interfering with the CrowdStrike Falcon sensor.

Step 6: Check Network Connectivity

CrowdStrike Falcon requires an active internet connection to communicate with the cloud servers. Without internet access, it will not be able to provide real-time protection.

  1. Check Internet Connection:

    • Open your browser and ensure you can access websites. If you can’t access websites, troubleshoot your network.
    • If you're using a VPN, disconnect from it temporarily to see if it's blocking Falcon's communication.

  2. Check for Proxy Issues:

    • If you are using a proxy server, ensure that the necessary configurations are set up to allow CrowdStrike Falcon traffic to pass through.

  3. Check Firewall:

    • Ensure that your firewall is not blocking the communication between your computer and CrowdStrike’s cloud servers. You may need to whitelist specific ports or IP addresses required by CrowdStrike Falcon.

7: Reinstall the CrowdStrike Falcon Sensor

If none of the previous steps resolve the issue, reinstalling the CrowdStrike Falcon sensor can help fix any corrupted files or installation issues.

  1. Uninstall the Current Falcon Sensor:

    • Windows: Go to Control Panel > Programs > Programs and Features, find CrowdStrike Falcon, and select Uninstall.
    • Mac: Go to Applications, find CrowdStrike Falcon, and drag it to the Trash.
    • Linux: Run the following command in the terminal:

  2. Download the Latest Falcon Sensor:

    • Obtain the latest version of CrowdStrike Falcon from your IT department or the CrowdStrike Console.

  3. Reinstall the Sensor:

    • Follow the installation process specific to your operating system:
      • Windows: Run the installer and follow the prompts.
      • Mac: Open the downloaded installer package and follow the instructions.
      • Linux: Run the installation script provided by CrowdStrike.

Step 8: Review Logs for Errors

If the issue persists, you can check the logs to see if any specific errors are causing the problem.

  1. Windows:

    • Open Event Viewer by pressing Win + X and selecting Event Viewer.
    • Look for logs related to CrowdStrike Falcon under Windows Logs > Application.

  2. Mac:

    • Open Console (found in Applications > Utilities).
    • Look for CrowdStrike Falcon entries in the logs.

  3. Linux:

    • Review the system logs in /var/log/syslog or the CrowdStrike logs located at /opt/CrowdStrike/log/ for any error messages related to the Falcon sensor.

Step 9: Contact CrowdStrike Support

If you have tried all of the above steps and CrowdStrike Falcon is still not working, it may be time to contact CrowdStrike Support.

  1. Submit a Support Ticket:

    • Provide your OS version, CrowdStrike Falcon version, and any error logs you've collected.

  2. Work with Your IT Team:

    • If you’re part of an organization, contact your IT team for further assistance in diagnosing and resolving the issue.

Conclusion

If CrowdStrike Falcon is not working on your computer, it could be caused by several factors such as service issues, security settings, network problems, or software conflicts. By following the troubleshooting steps outlined in this guide, you can likely resolve the issue and restore protection to your system.

  • Start by checking the sensor status and ensuring the service is running.
  • Verify that CrowdStrike has the necessary permissions and that no conflicting software is causing problems.
  • If all else fails, reinstalling the Falcon sensor or contacting CrowdStrike support can help resolve more complex issues.

By following these steps, you can ensure that your system remains secure with CrowdStrike Falcon.