How to configure windows for large number of concurrent connections

Question

I have seen many tutorial on how to tune Linux to scale Node.js or Erlang server to 600K+ concurrent connections.

But I have not found similar tutorial for windows, can someone help with what are the similar knobs that exist for Windows.

/etc/security/limits.d/custom.conf

In root soft nofile 1000000
root hard nofile 1000000
 * soft nofile 1000000
 * hard nofile 1000000
 * List item

/etc/sysctl.conf

 fs.file-max = 1000000
 fs.nr_open = 1000000       
 net.ipv4.netfilter.ip_conntrack_max = 1048576
 net.nf_conntrack_max = 1048576

“fs.file-max”

The maximum file handles that can be allocated

“fs.nr_open”

Max amount of file handles that can be opened

.net.ipv4.netfilter.ip_conntrack_max”

how many connections the NAT can keep track of in the “tracking” table Default is: 65536

Answer 1

// Increase total number of connection allowed [HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters] TcpnumConnections = 16,777,214

// increase MaxFreeTcbs to > than number concurrent connection [HKEY_LOCAL_MACHINE \System \CurrentControlSet \Services \Tcpip \Parameters] MaxFreeTcbs = 2000 (Default = RAM dependent, but usual Pro = 1000, Srv=2000)

// Increase hash table size for the hashtable helping TCP lookup [HKEY_LOCAL_MACHINE \System \CurrentControlSet \services \Tcpip \Parameters] MaxHashTableSize = 512 (Default = 512, Range = 64-65536)

// reduce tcp delay to limit half-open connection [HKEY_LOCAL_MACHINE\System \CurrentControlSet \services \Tcpip \Parameters] TcpTimedWaitDelay = 120 (Default = 240 secs, Range = 30-300)