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In C#, how to check if a TCP port is available?
In C# to use a TcpClient or generally to connect to a socket how can I first check if a certain port is free on my machine?
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NGINX to reverse proxy websockets AND enable SSL (wss://)?
... Ops Programmers have solved the situation with a brand spanking new nginx_tcp_proxy_module
Written in August 2012, so if you are from the future you should do your homework.
Prerequisites
Assumes you are using CentOS:
Remove current instance of NGINX (suggest using dev server for this)
If possible...
How to test which port MySQL is running on and whether it can be connected to?
...ee a line that looks like this if mysql is indeed listening on that port.
tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN
Port 3306 is MySql's default port.
To connect, you just have to use whatever client you require, such as the basic mysql client.
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裁员！裁员！创业者们的2016“寒冬大逃杀” - 资讯 - 清泛网 - 专注IT技能提升
...京SOHO曾零散地租了近13层楼，现在只有一层还留下来办公使用，其他都已经被转租出去了。
“游戏公司完全是一个项目定生死，项目做得好就活下来，赚大钱，新项目一般都没人投钱了，”一位美元基金合伙人对36氪说。
今...
Linux iptables防火墙开放mysql、apache的端口 - 操作系统(内核) - 清泛网 ...
...sql、apache的端口vi etc sysconfig iptables 修改配置，添加两条tcp端口允许的记录：[root@iZ23rlmiwviZ ~] cat etc sysconfig iptables sample configuration for iptables service vi /etc/sysconfig/iptables 修改配置，添加两条tcp端口允许的记录：
[root@iZ23rlmiwvi...
close vs shutdown socket?
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Keep in mind, even if you close() a TCP socket, it won't necessarily be immediately reusable anyway, since it will be in a TIME_WAIT state while the OS makes sure there's no outstanding packets that might get confused as new information if you were to immediate...
WebSockets protocol vs HTTP
..., but from the logic to parse/handle/store those headers. In addition, the TCP connection setup latency is probably a bigger factor than the size or processing time for each request.
2) Why was it implemented instead of updating HTTP protocol?
There are efforts to re-engineer the HTTP protocol to ...
菜单的背景颜色 - C/C++ - 清泛网 - 专注C/C++及内核技术
...果：
动态（纯代码）创建一个菜单
上面的例子，都是使用了菜单资源创建的菜单，这一次我们用代码来创建菜单，其实本质跟前面的用控件类的Create函数创建一个控件一样。只不过这里的“Create”函数是CreateMenu和CreatePopupMen...
炒股是世界难题！历史上那些名人炒股水平 - 轻松一刻 - 清泛网 - 专注C/C++...
...号码，便于人们识别。蒋介石当时的代号是“蒋伟记”，使用的牌号为“恒泰号”，他还是这个牌号下的股东。当时他以极小的4股“恒泰号”进入股市。通过炒作一年内使股价由30元涨至120元，收益翻了四倍；第二年又涨到200元...
How do multiple clients connect simultaneously to one port, say 80, on a server? [duplicate]
.... Nobody is ever in the "connected" state.
For a stateful protocol (like TCP), a connection is identified by a 4-tuple consisting of source and destination ports and source and destination IP addresses. So, if two different machines connect to the same port on a third machine, there are two disti...