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Comparing HTTP and FTP for transferring files
...aster. FTP requires a control channel and state be maintained besides the TCP state but HTTP does not. There are 6 packet transfers before data starts transferring in FTP but only 4 in HTTP.
I think a properly tuned TCP layer would have more effect on speed than the difference between application...
Rails server says port already used, how to kill that process?
...ype this in your terminal to find out the PID of the process:
$ lsof -wni tcp:3000
Then, use the number in the PID column to kill the process:
$ kill -9 PID
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...
stop all instances of node.js server
...NING" | find "8080"
The fifth column of the output is the process ID:
TCP 0.0.0.0:8080 0.0.0.0:0 LISTENING 14828
TCP [::]:8080 [::]:0 LISTENING 14828
You could then kill the process with taskkill /pid 14828. If the proces...
node and Error: EMFILE, too many open files
.../OFF NODE NAME
...
nodejs 12211 root 1012u IPv4 151317015 0t0 TCP 10.101.42.209:40371->54.236.3.170:80 (ESTABLISHED)
nodejs 12211 root 1013u IPv4 151279902 0t0 TCP 10.101.42.209:43656->54.236.3.172:80 (ESTABLISHED)
nodejs 12211 root 1014u IPv4 151317016 0t...
What can be the reasons of connection refused errors?
...
If you try to open a TCP connection to another host and see the error "Connection refused," it means that
You sent a TCP SYN packet to the other host.
Then you received a TCP RST packet in reply.
RST is a bit on the TCP packet which indicate...
How to close TCP and UDP ports via windows command line
Does somebody knows how to close a TCP or UDP socket for a single connection via windows command line?
17 Answers
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Checking network connection
...p (0.0048s latency).
Not shown: 999 filtered ports
PORT STATE SERVICE
53/tcp open domain
Nmap done: 1 IP address (1 host up) scanned in 23.81 seconds
As we can see, 53/tcp is open and non-filtered. If you are a non-root user, remember to use sudo or the -Pn argument for Nmap to send crafted pro...
CDN（内容分发网络）技术原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...于缓存服务器通常部署在靠近用户端，所以能获得近似局域网的响应速度，并有效减少广域带宽的消耗。据统计，Internet上超过80%的用户重复访问20%的信息资源，给缓存技术的应用提供了先决的条件。缓存服务器的体系结构与Web...
Open firewall port on CentOS 7
....
In the case of public try:
firewall-cmd --zone=public --add-port=2888/tcp --permanent
Then remember to reload the firewall for changes to take effect.
firewall-cmd --reload
Otherwise, substitute public for your zone, for example, if your zone is dmz:
firewall-cmd --zone=dmz --add-port=288...
CGRidCtrl控件 学习心得 - C/C++ - 清泛网 - 专注C/C++及内核技术
...，Ctrl-A全选
u 当单元格成为焦点，并且在单元格的编辑区域按下字符键，就意味着在
那个单元格进行编辑了
u 可以在单元格中加入图片
u 对大型数据可以使用"虚拟"模式
u 充分的打印支持，支持文档/浏览环境（包括打印...