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com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
...achable at all. This can have one or more of the following causes:
IP address or hostname in JDBC URL is wrong.
Hostname in JDBC URL is not recognized by local DNS server.
Port number is missing or wrong in JDBC URL.
DB server is down.
DB server doesn't accept TCP/IP connections.
D...
What can be the reasons of connection refused errors?
...king for firewalls and that the port is open, use telnet to connect to the ip/port to test connectivity. This removes any potential issues from your application.
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HTTP test server accepting GET/POST requests
...ttps://httpbin.org/anything Returns most of the below.
https://httpbin.org/ip Returns Origin IP.
https://httpbin.org/user-agent Returns user-agent.
https://httpbin.org/headers Returns header dict.
https://httpbin.org/get Returns GET data.
https://httpbin.org/post Returns POST data.
https://httpbin.o...
Connect to a locally built Jekyll Server using mobile devices in the LAN
...e command line.
That will make Jekyll's HTTP server bind to all available IPs, rather than just to localhost.
You can also add this to your _config.yml with host: 0.0.0.0. GitHub will simply ignore this when you push, so it's safe to use if you don't mind having your work openly accessible on your...
How do I simulate a low bandwidth, high latency environment?
... instructions, you're enabling a firewall. For just simulating a different IP connection, you could (for example) do the following:
Create a file /etc/rc.firewall.56k which contains the following:
ipfw add pipe 1 ip from any to any out
ipfw add pipe 2 ip from any to any in
ipfw pipe 1 config b...
我们这里5元30M - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...国高管对一位中国运营商的年轻老总说:在我们大寒冥国,网络带宽都是20M起,不知贵国情况如何?场面一度陷入僵局。这 在一次国际洽谈会上,一个韩国高管对一位中国运营商的年轻老总说:在我们大寒冥国,网络带宽都是20M起,不知...
BugTrap程序崩溃快照上传服务端开发配置 - C/C++ - 清泛网 - 专注C/C++及内核技术
...序崩溃快照、bug跟踪之利器》详细介绍了如何利用BugTrap监控程序崩溃，这里继续介绍如何将客户端的崩溃包上传至服务器端（当然前提是用户选择“发送报告”）。上一篇《BugTrap：程序崩溃快照、bug跟踪之利器》详细介绍了如...
由“Pure Virtual Function Called” 考虑到的 - C/C++ - 清泛网 - 专注C/C++及内核技术
...yDbg。
2．不要在构造函数、析构函数里调用虚函数
根据网络上一些文章的讲解，可能出现“Pure Virtual Function Called”的错误情况有5种：
1） 基类构造器直接调用虚函数；
2）基类析构器直接调用虚函数；
3）基类构造器间接调...
zmq的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
zmq的使用请参考《ZeroMQ实例-使用ZMQ(ZeroMQ)进行局域网内网络通信》想深入研究原理的请参考：《ZeroMQ的学习和研究（PHP代码实例）》请参考《ZeroMQ实例-使用ZMQ(ZeroMQ)进行局域网内网络通信》
想深入研究原理的请参考：《ZeroMQ的...
“互联网+”新经济轮廓初显 - 资讯 - 清泛网 - 专注C/C++及内核技术
...力，互联网支撑大众创业、万众创新的作用进一步增强，网络经济与实体经济协同互动的发展格局基本形成。
到2025年，网络化、智能化、服务化、协同化的“互联网＋”产业生态体系基本完善，“互联网＋”新经济形态初步形...