![]() ![]() Open the Task Manager from the Quick Access Menu Right-click Windows and open Task Manager. ![]() The high CPU usage by the LocalserviceNoNetworkFirewall could be a temporary glitch of the Windows Firewall and restarting the same may solve the problem. In such a case, you may try the solutions after disconnecting the system from the Internet (either by unplugging the ethernet cable or switching off the router) or try them in the safe mode of your system. Keep in mind that some of the users may fail to perform the under-mentioned solutions on their systems because the system can be very sluggish. Corrupt Settings of Windows Firewall: The LocalserviceNoNetworkFirewall service may show a high CPU usage if the Windows firewall settings have become corrupt due to interference from the other security product.Corrupt Installation of 3 rd Party Security Product: If the 3rd party security product like Avast Premium has become corrupt, then this corruption can cause the excessive use of the CPU by the LocalserviceNoNetworkFirewall.A Large Number of Conflicting Firewall Rules: If an old installation of a 3 rd party firewall has included thousands of inbound/outbound rules, while Windows defender has its own such rules, these conflicting rules may require the firewall to use the excessive CPU to execute all of them.Conflicting Firewalls: If you are using another firewall (especially, that is using the Windows Defender API) along with the Windows firewall, the two may conflict with each other, resulting in high CPU usage.Many things can trigger a high CPU usage by the LocalserviceNoNetworkFirewall but we identified the following chiefly responsible for the issue: LocalserviceNoNetworkFirewall High CPU Usage Usually, this service does not use much CPU or memory.īut the issue arises, when this service starts eating a chunk of memory along with high CPU usage (in some cases, more than 50%) and causes the system to be so sluggish that it becomes impossible to use the system. LocalserviceNoNetworkFirewall is a part of Windows security and is used by Windows Defender (or by other Windows API-based firewalls) in their operations.
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