Windows max tcp connections

Are you actually having an issue with it, or just out of curiosity thinking if such a limit could be changed? Add a comment.

Active Oldest Votes. But while technically you could have a large amount of connections, there are practical issues that limit the amount: each connection is identified by server address and port as well as client address and port. Also rarely a single client would open thousands of connections, but in NAT cases it may seem like it the server can only handle a certain amount of data and packets per second, so a high speed data transfer or lots of small packets may cause the number to go down the network hardware might not be able to handle all the traffic coming in the server has to have memory allocated for each connection, which again limits the number also what the server does is an important issue.

Sami Kuhmonen Sami Kuhmonen 28k 9 9 gold badges 57 57 silver badges 68 68 bronze badges. HarryJohnston But that is impossible to say without hardware information and used software.

Also the question mentioned hard coded limits in Linux, which don't exist in Windows. So yes, of course you can't expect a slow machine with single NIC to handle a million active FTP connections, but a hefty machine might handle the same, or a trillion connections for a chess server.

There actually does seem to be a fixed limit see my answer but in practice the points you raise are more important. Thanks Sami, Harry for your excellent info and insights. In my case there are multiple clients each initiating a connection and keeping it alive as it sends periodic data. This is basically some sensor data like temperature for example coming from the field.

Hence there can be multiple clients at the same time talking to the same port on the server. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks. Podcast Making Agile work for data science. Featured on Meta. New post summary designs on greatest hits now, everywhere else eventually.

HI Sorry for the late reply I have tried the answer, But still the server performance is not incresed. It always stuck on the user connection reaches between and , is it possible to allow concurrent connections to server or it depends on the DB performance. I noticed that you have opened a new thread about new question. Could you please accept the useful reply as answer to end this thread up? It will encourage the person who help you. What port s doesn't need administrator privilege to bind.

Skip to main content. 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. There is a parameter that limits the maximum number of connections that TCP may have open simultaneously.

Note: a 16 Million connection limit sounds very promising, but there are other parameters, which keeps us from ever reaching this limit. The default range for dynamic ports in Windows is to , thus giving outbound concurrent connections for each IP Address.