How to solve the problem of SSH connection disconnection on Linux server?

How to solve the SSH connection interruption problem on Linux servers

With the popularity of cloud computing and remote work, remote connection to Linux servers has become an indispensable part of daily work. However, sometimes the SSH connection may be interrupted, causing us inconvenience and trouble. This article will share some methods to solve the problem of SSH connection interruption on Linux servers to help you better manage and maintain the server.

1. Network problems

First of all, we need to eliminate network problems. Whether the network is stable or not directly affects the quality of the SSH connection. Here are some network issues that can cause SSH connections to drop and how to fix them:

1. Network Latency: Check if the network latency is too high. Use the ping command to test the server's network connectivity and check the returned latency value. If the latency value is high, you may need to optimize your network connection or choose a more stable network provider.
2. Packet loss rate: If you often encounter the problem of SSH connection interruption, it is recommended to use the traceroute command to check the packet loss rate. If you find that the packet loss rate is very high, there may be a problem with the network link or server. You can contact your network administrator to resolve this issue.
3. Firewall settings: Check the firewall settings on the server, especially software firewalls such as iptables or ufw. Sometimes there is a problem with the firewall configuration, which will cause the SSH connection to be blocked. Make sure the firewall rules are configured correctly to allow SSH connections through.

2. SSH configuration issues

In addition to network issues, some SSH configuration issues may also cause connection interruption. The following are some common SSH configuration problems and solutions:

1. Idle timeout: The timeout for the SSH session may be set on the server. If you do not operate an SSH session for a long time, you may be disconnected by the server. The timeout can be extended by modifying the ClientAliveInterval and ClientAliveCountMax parameters in the sshd_config file.
2. Maximum connection limit: Under high load conditions, the server may set a maximum connection limit. If you are unable to connect to the server, it may be because the number of connections has reached the limit. The maximum number of connections can be increased by modifying the MaxSessions parameter in the sshd_config file.
3. SSH version mismatch: A version mismatch between the SSH client and server may also cause the connection to be interrupted. Make sure the versions between the SSH client and server you are using are compatible, and you can select a supported SSH version by modifying the Protocol parameter in the sshd_config file.

3. Server resource issues

Finally, insufficient server resources may also cause the SSH connection to be interrupted. Here are some solutions to server resource issues:

1. Insufficient memory: If the server is low on memory, it may cause the system to crash or respond slowly, interrupting the SSH connection. Solve this problem by monitoring memory usage and expanding the server's memory in a timely manner.
2. CPU load is too high: If the server's CPU load is too high, the SSH connection may be interrupted. Use tools such as top or htop to monitor CPU usage and try to optimize the application to reduce CPU load.
3. Insufficient disk space: If there is insufficient disk space, the system may not be able to write data, thus interrupting the SSH connection. Solve this problem by cleaning up regularly or increasing disk space.

Summary

When using a Linux server, SSH connection interruption is a common problem. This article introduces some problems and solutions that may cause SSH connection interruption, including network problems, SSH configuration problems, and server resource problems. By troubleshooting and resolving these issues, you will be able to better manage and maintain your Linux server and maintain the stability of your SSH connections.

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