Windows 2008 tcp socket limit

When the loop is the client finishes with all requests sent. When the loop goes beyond it starts to have time outs after finish the first X number of requests. Why is this? I have made sure to close my socket in the loop. This value is tunable. This will also "run you out of sockets" even though they are closed.

This can happen because packets are delayed or the other side just doesn't know that the socket has been closed yet. This allows the OS to silently drop those packets without a chance of "infecting" a different, unrelated socket connection. When looking for the max performance you run into a lot of issue and potential bottlenecks. Running a simple hello world test is not necessarily going to find them all.

Using select does not work beyond the hard-coded maximum file descriptor limit set at compile-time, which is hopeless normally , or a few more. The issues with system imposed limits is a configuration issue, already touched upon in previous comments. The internal implications to TCP is not so clear to me. Each port requires memory for it's instantiation, goes onto a list and needs network buffers for data in transit.

Given 64K TCP sessions the overhead for instances of the ports might be an issue on a bit kernel, but not a bit kernel correction here gladly accepted.

The lookup process with 64K sessions can slow things a bit and every packet hits the timer queues, which can also be problematic. Storage for in transit data can theoretically swell to the window size times ports maybe 8 GByte. The issue with connection speed mentioned above is probably what you are seeing. TCP generally takes time to do things. However, it is not required. A TCP connect, transact and disconnect can be done very efficiently check to see how the TCP sessions are created and closed.

There are systems that pass tens of gigabits per second, so the packet level scaling should be OK. Consider an experiment where you login to the local host 10, times. Then type a character. The entire stack through user space would be engaged on each character. The active footprint would likely exceed the data cache size. Running through lots of memory can stress the VM system.

The cost of context switches could approach a second! Uptime Infrastructure Monitor is a heavily network-dependent application and requires many short-lived socket connections to be running simultaneously. At times this socket load can reach or exceed the default Windows monitoring station socket limit. Symptoms of socket limits within Uptime Infrastructure Monitor include:.

To increase the Windows socket limits and allow sockets to be freed up more quickly, create 2 keys in the Windows registry using regedit. Related KB - monitor failed: software caused connection abort: recv failed. Knowledge Base. Connect and share knowledge within a single location that is structured and easy to search. I have. Net service that listens on single port over TCP protocol.

Clients connect and then transmit data for some time from few minutes to several hours. Is there any limit on number of connections on Windows server? I did not hit any, since now there is up to 50 users. Plan is to have thousands of users, so I'd like to know if there will be problems in future. Edit: As Cloud answered, it seems that there are some limits in some versions of Windows Server Is there any reference on those limits?

I tried Google, but it returns articles on limit on half-bound tcp connections. I would be extremely surprised if Windows Server is limited to less than Server and, IMHO, the posting that Cloud links to is too vague to be much use. Personally I'd test it and see.

Even if there is no inherent limit in the Windows Server version that you intend to use there will still be practical limits based on memory, processor speed and server design.

If you want to run some 'generic' tests you can use my multi-client connection test and the associated echo server. These are what I used to run my own tests for my server framework and these are what allowed me to create 70, active connections on a Windows Server VM with MB of memory.

This will help to prevent you building the server in ways that restrict its scalability. There is a limit on the number of half-open connections , but afaik not for active connections. Although it appears to depend on the type of Windows server, at least according to this MSFT employee :. It depends on the edition, Web and Foundation editions have connection limits while Standard, Enterprise, and Datacenter do not.

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