###
VSCode SSH Remote
Connection Troubleshooting
When encountering the "
could not establish connection" error in
VSCode while attempting to
connect via SSH, several factors may contribute to this issue. Below is a comprehensive analysis and solution approach for resolving this problem.
#### 1. **Verify SSH Configuration**
Ensure that the SSH configuration file (`~/.ssh/config`) is correctly set up. The file should include entries like the following:
```plaintext
Host myserver
HostName <remote-server-ip>
User <username>
IdentityFile ~/.ssh/<private-key-file>
```
This ensures that
VSCode can locate the correct server details[^1]. If the `IdentityFile` path is incorrect or the key does
not have appropriate permissions, the
connection will fail.
#### 2. **Check SSH Key Permissions**
The private key file used for authentication must have restricted permissions. Use the following command to adjust permissions if necessary:
```bash
chmod 600 ~/.ssh/<private-key-file>
```
Incorrect permissions on the key file can lead to authentication failure[^1].
#### 3. **Test SSH
Connectivity Manually**
Before troubleshooting within
VSCode, test the SSH
connection manually from the terminal:
```bash
ssh <username>@<remote-server-ip>
```
If the manual
connection fails, it indicates an issue with the SSH setup rather than
VSCode itself. Common causes include misconfigured firewalls, incorrect server addresses, or expired keys[^1].
#### 4. **Update
VSCode and Extensions**
Ensure that both
VSCode and the Remote-SSH extension are updated to their latest versions. Outdated software can introduce compatibility issues that prevent successful
connections.
#### 5. **Inspect
VSCode Logs**
VSCode provides detailed logs for SSH
connections. Access these logs by clicking on the "Output" tab in the bottom panel and selecting "Remote - SSH" from the dropdown menu. Reviewing these logs can reveal specific errors or misconfigurations causing the
connection failure.
#### 6. **Firewall and Network Restrictions**
Confirm that no firewall rules or network restrictions block the SSH port (default: 22) between your local machine and the remote server. If the server uses a non-standard port, ensure that the `Host` entry in the SSH configuration specifies the correct port:
```plaintext
Port <custom-port-number>
```
#### 7. **Reinstall Remote-SSH Extension**
In some cases, reinstalling the Remote-SSH extension resolves underlying issues. Uninstall the extension, restart
VSCode, and then reinstall it.
#### 8. **Use Correct Server Address**
Double-check the server address being used. Typographical errors in the IP address or hostname can result in failed
connections. Additionally, confirm that the DNS resolution for the hostname works properly if using one instead of an IP address.
```python
import socket
def test_dns_resolution(hostname):
try:
ip_address = socket.gethostbyname(hostname)
print(f"{hostname} resolves to {ip_address}")
except socket.gaierror:
print(f"Failed to resolve {hostname}")
test_dns_resolution("<your-hostname>")
```
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