How to fix error error-too-many-semaphores in Windows 11

Solution Steps

1. 1 Press Ctrl+Shift+Esc to open Task Manager. Go to the 'Processes' tab and sort by CPU or Memory usage. Identify any programs that are using a lot of resources and close them if they're not essential. Right-click the process and select 'End task'. This frees up semaphores and other system resources.
2. 2 Restart your computer. This clears all semaphores and resets the system to a clean state. It's the simplest way to fix resource exhaustion. After rebooting, try to avoid opening too many programs at once.
3. 3 If the error occurs in a specific application, check for updates. Press Windows key + I, go to 'Apps' → 'Installed apps', find the app, and see if there's an update option. Alternatively, visit the developer's website. Updates often fix resource leaks.
4. 4 Increase the system's semaphore limit. Press Windows key + R, type 'regedit', and press Enter. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager. Look for a DWORD value named 'SemaphoreLimit'. If it doesn't exist, right-click, select 'New' → 'DWORD (32-bit) Value', and name it 'SemaphoreLimit'. Double-click it, set the base to Decimal, and enter a higher value like 2048. Click OK and restart. This gives Windows more semaphores to work with.
5. 5 If the error persists, use Process Explorer (a free tool from Microsoft) to identify which process is leaking semaphores. Download it from the official Microsoft website, run it, and look for processes with a high 'Handles' count. You can then close or restart that process.