# In your .bashrc or .profile ulimit -n 65535 Then modify /etc/security/limits.conf :
* soft nofile 65535 * hard nofile 65535 root soft nofile 65535 root hard nofile 65535 Set environment variable before launching: increase maximum file handles windows 11.0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows Add or modify these values: # In your
set UV_THREADPOOL_SIZE=128 set NODE_OPTIONS=--max-old-space-size=4096 node --max-http-header-size=80000 server.js Pass these arguments: Each window station (e
# Check handle usage for a specific process (e.g., PID 1234) Get-Process -Id 1234 | Select-Object Name, HandleCount Get-Process | Sort-Object HandleCount -Descending | Select-Object -First 5 Name, HandleCount Check total system handles (Approximate) (Get-Counter "\System\Processes").CounterSamples The Warning Signs If a single process exceeds 10,000–16,000 handles , or if the system total exceeds 16 million handles , you will start seeing failures. The default per-process limit is tied to Desktop Heap , not a flat number. Step 2: Increasing Desktop Heap (The Real Fix) Most "out of handles" errors on Windows 11 actually stem from a 20-year-old artifact: the Desktop Heap . Each window station (e.g., WinSta0 ) has a fixed heap size for User and GDI objects.