In the case of a card, please check the usage of your server first.
1. Whether the CPU usage rate is greater than 50%.
2. Whether the memory usage is too high.
3. Whether the network usage rate is too high. If you purchased 10mbps, then if the network card of your server has a connection rate of 100mbps, when the network usage is about 10%, it means that your server bandwidth is full, and so on, if it is a gigabit network card (Connection rate 1000mbps), then 1% is 10mbps. If the above situation occurs, it means that your server or network cannot carry your current services. Please contact the sales staff to adjust your resources. If the above situation does not occur, it may be caused by the following reasons:
(1, your server encounters a CC attack, and you need to contact after-sales personnel to make a CC protection strategy.
(2, your server encounters a large traffic attack, but the server is not trafficked Traction.
(3. Your equipment network card failure, network cable failure, upper switch failure. Before the failure, you can test the adjacent IP of your server, if the adjacent IP also has packet loss, it means the upper switch Equipment failure.
(4. Computer room network failure. This will be a large-scale failure. In the case of a card, the general performance conditions will appear: 1. The server is seriously losing packets, and the normal server packet loss rate is 0%. If the rate is higher than 1%, there will be a card situation. 2. Some users have cards and some users do not. This may be caused by hardware firewalls and some links are blocked.
4. In addition, the above situation may also be caused by an Internet node failure. When a card situation occurs, in order to be able to accurately determine the fault technically, please make the following judgments (1, please check whether your local network is normal, if it is not a local network problem, it may be a server failure. Local network detection method: Ping test your server, and perform synchronous ping test on some other websites at the same time. If your server loses serious packets and other servers do not lose packets, it means that the fault lies in your server.
(2, confirm that your server has no users who are not cards. Generally speaking, all user cards, or some user cards. Which user is the user of the specific card.