![]() ![]() It is possible to change the upper limit with this DWORD registry key: ![]() The default range for dynamic ports in Windows is 1024 to 5000, thus giving 3977 outbound concurrent connections for each IP Address. When a client makes a connect() call to make a connection to a server, then the client invisible/implicit bind the socket to a local dynamic (anonymous, ephemeral, short-lived) port number. Note a 16 Million connection limit sounds very promising, but there are other parameters (See below), which keeps us from ever reaching this limit. There is a parameter that limits the maximum number of connections that TCP may have open simultaneously. If running applications that are constantly opening and closing connections (P2P), or are providing a service which many tries to connect to at the same time (Web-server like IIS), then one can improve the performance of these applications by changing the restriction limits. To keep the TCP/IP stack from taking all resources on the computer, there are different parameters that control how many connections it can handle. ![]()
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