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Device connection

When Avalon needs to connect to a network device (service, WebSSH, data gathering, autodiscovery, ZTP), it automatically determines which credentials to use by following a resolution cascade.

Resolution cascade

The resolution follows 4 steps, in order. As soon as a step succeeds, the remaining steps are skipped.

Step 1 – Bypass device type

If the device type has the Bypass other service accounts option enabled and a service account is assigned to it, that service account is used directly. No other step is evaluated.

Step 2 – User credentials

The behavior of this step depends on the user account usage mode configured on the tenant:

  • Never: this step is skipped, Avalon proceeds directly to step 3.
  • WebSSH Only: user credentials are only used for WebSSH sessions. For all other actions (services, data gathering, autodiscovery), Avalon proceeds to step 3.
  • Always: all interactive actions use user credentials. The credentials prompt always appears, even if the targeted device types have bypass enabled. The backend then determines for each device whether to use the entered credentials or the device type SA.

For the Always and WebSSH Only modes (when applicable):

  • Avalon looks for the user's credentials in cache.
  • If found: those credentials are used.
  • If expired or missing: a credentials prompt appears. The user must enter their credentials to continue.
Credentials prompt
User credentials prompt.

Once entered, credentials are cached for the TTL duration configured on the tenant. The remaining time is visible in the status bar. The Clear credentials icon (next to the TTL counter) allows you to manually clear the cache and re-enter new credentials without logging out.

TTL in status bar
Credentials TTL displayed in the status bar.

Scheduled tasks

The scheduler is not an interactive session. This step is automatically skipped for scheduled tasks, which always use a service account (steps 3 or 4).

Step 3 – Device type service account

If a service account is assigned to the device type (without the bypass option), that service account is used.

Step 4 – Tenant service account

Last resort: Avalon uses the service account assigned to the tenant. If no service account is found at this step, the operation fails.

Resolution diagram

graph TD
    Start[Connect to a device] --> Step1{Bypass enabled<br/>on the device type?}

    Step1 -->|Yes + SA configured| UseSABypass[Use the device type<br/>SA]
    Step1 -->|No| LiveCheck{Scheduled task<br/>or interactive session?}

    LiveCheck -->|Scheduled task| Step3{SA assigned<br/>to the device type?}
    LiveCheck -->|Interactive session| Step2{User account<br/>usage mode?}

    Step2 -->|Never| Step3
    Step2 -->|WebSSH Only| WebSSHCheck{WebSSH<br/>session?}
    Step2 -->|Always| CheckCache{Credentials<br/>in cache?}

    WebSSHCheck -->|No| Step3
    WebSSHCheck -->|Yes| CheckCache

    CheckCache -->|Yes, TTL valid| UseUser[Use user<br/>credentials]
    CheckCache -->|No or expired| Popup[Credentials<br/>prompt]
    Popup -->|Confirmed| UseUser

    Step3 -->|Yes| UseSADevice[Use the device type<br/>SA]
    Step3 -->|No| Step4{SA assigned<br/>to the tenant?}

    Step4 -->|Yes| UseSATenant[Use the tenant<br/>SA]
    Step4 -->|No| Error[Error:<br/>no credentials found]

    classDef successClass fill:#dcfce7,stroke:#166534,stroke-width:2px,color:#166534;
    classDef failClass fill:#fee2e2,stroke:#991b1b,stroke-width:2px,color:#991b1b;
    classDef neutralClass fill:#dbeafe,stroke:#1D335D,stroke-width:2px,color:#1D335D;
    classDef userClass fill:#BED1ED,stroke:#2F54A1,stroke-width:2px,color:#1D335D;
    classDef popupClass fill:#86A0CB,stroke:#1D335D,stroke-width:2px,color:#fff;

    class UseSABypass,UseSADevice,UseSATenant successClass;
    class Error failClass;
    class Start,Step1,Step2,Step3,Step4,CheckCache,LiveCheck,WebSSHCheck neutralClass;
    class UseUser userClass;
    class Popup popupClass;

Common scenarios

N° Mode Action Source Result
1 Always Service Map / Eng. Rules Device type SA (bypass) → User creds
2 Always AutoDiscovery Map Device type SA (bypass) → User creds
3 Always WebSSH Map Device type SA (bypass) → User creds
4 WebSSH Only WebSSH Map Device type SA (bypass) → User creds
5 WebSSH Only Service Map / Eng. Rules Device type SA (bypass) → Device type SA → Tenant SA
6 WebSSH Only AutoDiscovery Map Device type SA (bypass) → Device type SA → Tenant SA
7 Never Any Map / Eng. Rules Device type SA (bypass) → Device type SA → Tenant SA
8 Any mode Any Schedule Device type SA (bypass) → Device type SA → Tenant SA

Configuration