Analysis of the reason why the server cannot connect remotely

As a server administrator , Have you ever encountered a situation where the server cannot connect remotely , Today, Feifei will analyze with you .

The reason why the server cannot connect remotely

1、 Full bandwidth （ Not necessarily the bandwidth of normal business , It may be the abnormal contract awarding after China and Malaysia ）.
2、 System problems ： stuck 、 Blue screen 、 The loss of system files leads to system damage, etc .
3、 After installing safety software in the system , Blocked without opening the corresponding protocol and port .
4、 Modified the remote port number , However, the system firewall rules or the rules of security software have not been modified .
5、 The remote service is not turned on
6、 Maliciously DDOS attack , The traffic exceeds the defense peak, resulting in IP Be sealed up , Not yet unsealed .

Troubleshooting ideas

1、 When you cannot connect remotely , The server IP Yes no ping through （ Not prohibited ping Under the circumstances ）
2、 When you cannot connect remotely , Gateway to the server IP whether ping through （ So as to judge whether it is the wiring problem of the machine room ）
3、 At the same time, use third-party tools to test ping The server IP And server gateway IP, For example, there are many webmaster tools ping,webkaka,17ce wait
4、 Whether the remote connection port is connected , It can be used telnet+ip+port To test . For example, enter telnet 8.8.8.8 3389