ubuntu ssh:Network error: Connection refused
时间: 2025-04-18 17:19:20 浏览: 27
### Ubuntu SSH Connection Refused Network Error Solution
When encountering an issue where SSH connections are being refused on an Ubuntu system, several potential causes and solutions can be explored. A common reason for this problem is that the OpenSSH server might not be installed or could have stopped functioning properly.
To verify whether the SSH service is active, one should check its status using `systemctl`:
```bash
sudo systemctl status ssh
```
If the service appears inactive, restarting it may resolve connectivity issues[^1]:
```bash
sudo systemctl restart ssh
```
Another critical aspect involves ensuring firewall settings do not block incoming SSH requests. By default, UFW (Uncomplicated Firewall), which comes pre-installed with many Linux distributions including Ubuntu, blocks all inbound traffic unless explicitly allowed. To permit SSH access through port 22, execute these commands:
```bash
sudo ufw allow ssh
sudo ufw reload
```
Additionally, verifying configuration files within `/etc/ssh/sshd_config` ensures no misconfigurations exist preventing proper operation of the SSH daemon. Common adjustments include setting `PermitRootLogin`, adjusting `PasswordAuthentication`, and confirming correct listening addresses under `ListenAddress`.
Lastly, examining logs located at `/var/log/auth.log` provides insight into any authentication failures or other errors related to attempted SSH sessions. This diagnostic step helps pinpoint specific reasons behind denied connections.
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