What Do I Do If Error Message "Host key verification failed" or "Port forwarding is disabled" Is Displayed?¶

Symptom¶

Possible Cause¶

After the notebook instance is restarted, its public key changes. The alarm is generated when OpenSSH detected the key change.

Solution¶

Add -o StrictHostKeyChecking=no for remote access through the CLI in VS Code.
```
ssh -tt -o StrictHostKeyChecking=no -i ${IdentityFile} ${User}@${HostName} -p ${Port}
```
Parameters:
- IdentityFile: Path to the local key
- User: Username, for example, ma-user
- HostName: IP address
- Port: Port number

Add StrictHostKeyChecking no and UserKnownHostsFile=/dev/null to the local ssh config file for manual configuration of remote access in VS Code.

Host xxx
    HostName x.x.x.x # IP address
    Port 22522
    User ma-user
    IdentityFile C:/Users/my.pem
    StrictHostKeyChecking no
    UserKnownHostsFile=/dev/null
    ForwardAgent yes

Note that SSH logins will be insecure after the preceding parameters are added because the known_hosts file will be ignored during the logins.

last updated: 2025-08-26 08:17 UTC - commit: 1ba1873d960563c60759f67898a855d9ba3c3502