Is it a Virus?
✔ NO - Safe
Should be located in C:\Windows\System32\MPSSVC.dll
Warning
Normal for firewall to run continuously
Microsoft-signed component. Non-Microsoft sources posing as firewall-service are suspicious.
Can I Disable?
✔ YES
Disabling reduces protection; use Windows Security to turn off firewall on specific networks or disable via Services if needed
What is firewall-service?
firewall-service is the Windows Defender Firewall system process that enforces network protection rules on your device. It runs in the background, evaluates traffic, blocks unauthorized connections, and applies security policies from Windows updates and Defender definitions.
firewall-service runs as a Windows service (MpsSvc) that enforces Defender Firewall rules via MPSSVC.dll. It uses the Windows Filtering Platform to monitor connections, enforce allow/deny policies, and update rules from Defender definitions to protect the host.
Quick Fact: The firewall-service coordinates with WFP to enforce network policies across all profiles (Domain, Private, Public).
Types of Firewall-Related Processes
- Service Process: MpsSvc-hosted service controlling firewall policy enforcement
- DLL/Platform Layer: MPSSVC.dll provides firewall rule logic via the OS kernel interfaces
- UI Helper: Windows Security firewall UI components that query the service
- Policy Update: Background tasks that fetch Defender definitions and apply new rules
- Logging: Firewall event logging for connection attempts and blocked traffic
- Network Filter: Integrates with the Windows Filtering Platform to enforce decisions
Is firewall-service Safe?
Yes, firewall-service is safe when it is the legitimate Windows Defender Firewall service from Microsoft and located in the system directories.
Is firewall-service a Virus or Malware?
The real firewall-service is NOT a virus. However, malware may disguise itself by mimicking service names.
How to Tell if firewall-service is Legitimate or Malware
- File Location:: Must be in
C:\Windows\System32\MPSSVC.dll. Any firewall-service binary elsewhere is suspicious.
- Digital Signature:: Right-click the file in File Explorer → Properties → Digital Signatures. Should show "Microsoft Corporation".
- Resource Usage:: Normal usage is minimal (0.5-3% CPU, 30-150 MB memory). Abnormal sustained high usage is suspicious.
- Behavior:: Firewall service should not be intermittently missing after a reboot. Persistent absence or irregular spikes require malware scan.
Red Flags: If firewall-service appears to run from an unusual folder (such as a user directory), lacks a valid Microsoft signature, or shows constant abnormal resource usage, run a full antivirus and verify with Windows Security.
Why Is firewall-service Running on My PC?
firewall-service runs to enforce the configured firewall policies as soon as the OS boots and whenever network policy updates arrive. It ensures active protection against unsolicited connections and policy changes.
Reasons it's running:
- Policy Enforcement: The service actively enforces inbound/outbound rules defined by Windows Defender Firewall and any domain policies.
- Background Network Monitoring: It monitors connection attempts and blocks or allows traffic in real time based on rules.
- Startup and Resume: The service starts during OS boot to protect interfaces immediately on login or wake.
- Definition Updates: Defender rule updates may trigger a brief activity as new protections are downloaded and applied.
- Profile-Specific Behavior: The service adapts rules per network profile (Domain, Private, Public) and may appear more active on domain-connected devices.
Can I Disable or Remove firewall-service?
Yes, you can disable firewall-service. It is possible to turn off Windows Defender Firewall, but you should have an alternative protection plan in place.
How to Stop firewall-service
- Open Services: Press Win+R, type services.msc, and press Enter.
- Locate Windows Defender Firewall: Find the service named "Windows Defender Firewall" or the MpsSvc entry.
- Stop the Service: Right-click → Stop. If Stop is disabled, proceed to the next step.
- Disable Startup: Right-click → Properties, set Startup type to Disabled, Apply, then OK.
- Alternative Disabling: Alternatively disable via Windows Security → Firewall & network protection → Turn off for Domain/Private/Public networks (not recommended).
How to Uninstall Firewall
- ✔ Windows Defender Firewall is a core Windows feature and cannot be uninstalled. You can disable it via Services or Windows Security.
- ✔ To protect your system, ensure you have another firewall or security solution enabled if you disable Defender Firewall.
- ✔ If you are using a third-party firewall, follow its vendor instructions to disable or uninstall that product.
Common Problems: High CPU or Memory Usage
If firewall-service is consuming excessive resources:
Common Causes & Solutions
- Too Many Active Network Rules: Review and prune rules; remove duplicates; use Windows Firewall with Advanced Security to audit rules.
- Background App Interactions: Disable or limit non-essential apps' network access; check Windows Security app for blocked apps.
- Outdated Definitions: Update Defender definitions and Windows OS to ensure efficient rule processing.
- Malware Compromise: Run a full malware scan with Windows Defender or a trusted third-party AV; isolate or clean infected systems.
- Conflicting Firewall Suites: Disable or uninstall third-party firewall software that may conflict with Defender Firewall.
- Corrupted Firewall Engine: Run system file checker (sfc /scannow) and DISM; consider repairing Windows components if issues persist.
Quick Fixes:
1. Quick Fixes:
2. 1. Open Windows Defender Firewall settings and review active rules.
3. Reset firewall to default settings via Windows Security.
4. Update Windows and Defender definitions.
5. Run a full system scan for malware.
6. Restart the Firewall service or the entire system if necessary.
Frequently Asked Questions
Is firewall-service safe?
Yes. firewall-service is the built-in Windows Defender Firewall component. Ensure it is located in C:\Windows\System32\MPSSVC.dll and digitally signed by Microsoft Corporation.
Why is firewall-service running all the time?
Because Windows Defender Firewall is active by default to monitor and regulate all network traffic and protect the system from unauthorized access.
Can I disable firewall-service?
Yes, you can disable it, but you should have an alternative protective solution in place. Use Services or Windows Security to turn off the firewall for specific networks.
How do I allow an app through the firewall?
Open Windows Defender Firewall with Advanced Security, click Allow an app or feature through firewall, and add the program with appropriate network profiles.
How do I check firewall status or logs?
Use the Event Viewer (Windows Logs → Security) or the Windows Defender Firewall with Advanced Security console to view logs and rule activity.
What happens if the firewall is turned off?
Disabling the firewall removes the default barrier against unsolicited connections. Ensure other security controls are in place if you disable it.