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Increasing the maximum number of TCP/IP connections in Linux
...y.
On the client side:
Increase the ephermal port range, and decrease the tcp_fin_timeout
To find out the default values:
sysctl net.ipv4.ip_local_port_range
sysctl net.ipv4.tcp_fin_timeout
The ephermal port range defines the maximum number of outbound sockets a host can create from a particula...
App Inventor 2 数学积木的9个隐藏用法：随机种子、位运算、取整陷阱，踩中...
...直接切二进制/八进制/十进制/十六进制输入模式，写 IoT 通信协议或处理硬件返回值时特别顺手。
技巧2：random set seed 让"随机"变得可复现
做测试或教学演示时，随机数每次不一样反而不好调试。random set seed to 块可...
数据存储组件 · App Inventor 2 中文网
...用SSL
设置为真则使用SSL加密通道与云数据库/Redis服务器通信。如果上面服务地址设置“DEFAULT”的话，这个应该设置为真。
事件
云数据库错误(消息)
表示与云数据库Redis服务器通信时发生错误。
数据发...
Boost.Asio的简单使用(Timer,Thread,Io_service类) - C/C++ - 清泛网 - 专注C/C++及内核技术
...的参数
4. 成员函数作为回调函数
5. 多线程回调同步
6. TCP客户端:对准时间
7. TCP同步时间服务器
1. 同步Timer
本章介绍asio如何在定时器上进行阻塞等待(blocking wait).
实现,我们包含必要的头文件.
所有的asio类可以简单的通...
How to find the port for MS SQL Server 2008?
...Click on SQL Native Client 10.0 Configuration -> Client Protocols -> TCP/IP
double click ( Right click select Properties ) on TCP/IP.
You will find Default Port 1433.
Depending on connection, the port number may vary.
...
How to find SQL Server running port?
...g on'
GO
http://www.mssqltips.com/sqlservertip/2495/identify-sql-server-tcp-ip-port-being-used/
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Do I need to heartbeat to keep a TCP connection open?
I have two components that that communicate via TCP/IP. Component A acts as a server/listener and Component B is the client. The two should communicate as quickly as possible. There can only ever be one connection at any time (though that is aside to this question). A senior developer at my comp...
What is the fundamental difference between WebSockets and pure TCP?
...d about WebSockets and I wonder why browser couldn't simply open trivial TCP connection and communicate with server like any other desktop application. And why this communication is possible via websockets?
...
程序员之网络安全系列（六）：动态密码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...水” 而不是别人，不然别人就把钱转走了。
虽然我们从通信，数据加密等方式确保用户密码不背攻击者破解，但是如果攻击者使用键盘记录器等工具知道了用户密码，那么就可以冒充用户了。
比如银行的U盾，因为我对这块业...
What causes a TCP/IP reset (RST) flag to be sent?
I'm trying to figure out why my app's TCP/IP connection keeps hiccuping every 10 minutes (exactly, within 1-2 seconds). I ran Wireshark and discovered that after 10 minutes of inactivity the other end is sending a packet with the reset (RST) flag set. A google search tells me "the RESET flag signif...