CODEWITHSUNDEEP
socketstcp
misterbaykal
misterbaykal

Reputation: 542

How many TCP/IP socket connections can a system(computer) handle?

I have been working on a project regarding TCP/IP socket connection and message transferring through these sockets. I am connecting to a UNIX server with a specific IP address and establishing socket connections. So far I could manage roughly 16000 connections from 1 host (in this case this is my own pc). And when I try establishing other connections from other hosts (either it is Mac Osx or Windows PC), I reached the same maximum connection number, 16000.

I can have 65536 connections on server side and I literally maintained that. But only when it is 16000 connections in each of 4 different computers. I wonder why I have this and how I can establish more than 16000 connections from only 1 host.

Upvotes: 4

Views: 10151

Answers (1)

Remus Rusanu
Remus Rusanu

Reputation: 294177

On Windows systems the TCP stack is subject to several registry parameters. They're arcane and poorly documented, and had changed with newer (Vista, Win7, Win8) releases, they also vary between desktop OS and server OS flavors.

Some KBs and MSDN articles cover the subject:

But this article is more to the point for your problem: Avoiding TCP/IP Port Exhaustion. Although is BizTalk related, the topic and solution are generic: increase MaxUserPort and decrease TcpTimedWaitDelay (careful with the later one though). The specifics your system ends up supporting vary, so you have to play with the settings. Make sure your test machines are 64 bit processor, 64 bit OS, and have enough of RAM (>4Gb).

For OS X I hope somebody else will provide the details.

Upvotes: 4

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