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Analysis of the reason why the server cannot connect remotely


The common reasons why the server cannot connect remotely are as follows:

  1. The bandwidth is full (not necessarily the normal service bandwidth, but may be the abnormal sending after China Malaysia).
  2. System problems: stuck, blue screen, system file loss and system damage.
  3. After the security software is installed in the system, the corresponding protocol and port are not opened and are blocked.
  4. The remote port number is modified, but the system firewall rules or security software rules are not modified.
  5. The remote service is not turned on.
  6. The IP is blocked but not unblocked due to malicious DDOS attacks and traffic exceeding the defense peak.

Troubleshooting ideas:

  1. Whether the server IP can be pinged when remote connection is unavailable (if pinging is not disabled)
  2. Whether the gateway IP address of the server can be pinged when the remote connection is unavailable (to determine whether it is a problem of the machine room circuit)
  3. At the same time, use third-party tools to test the ping server IP and server gateway IP, such as multi ping, webkaka, 17ce, etc. of webmaster tools
  4. The remote connection port can be tested by telnet+ip+port. For example, enter at the command line telnet 3389