App-vNext/Polly · error · ArgumentOutOfRangeException

Value must be less than or equal to one.

Error message

Value must be less than or equal to one.

What it means

Thrown by the async AdvancedCircuitBreakerAsync<T> syntax when failureThreshold exceeds 1. failureThreshold is a ratio in (0,1]; values above 1 are invalid (>100% failure rate). Fires at policy build time.

Source

Thrown at src/Polly/CircuitBreaker/AsyncAdvancedCircuitBreakerTResultSyntax.cs:226

    /// <exception cref="ArgumentOutOfRangeException">failureThreshold;Value must be less than or equal to one.</exception>
    /// <exception cref="ArgumentOutOfRangeException">samplingDuration;Value must be equal to or greater than the minimum resolution of the CircuitBreaker timer.</exception>
    /// <exception cref="ArgumentOutOfRangeException">minimumThroughput;Value must be greater than one.</exception>
    /// <exception cref="ArgumentOutOfRangeException">durationOfBreak;Value must be greater than zero.</exception>
    /// <exception cref="ArgumentNullException">Thrown when <paramref name="onBreak"/> is <see langword="null"/>.</exception>
    /// <exception cref="ArgumentNullException">Thrown when <paramref name="onReset"/> is <see langword="null"/>.</exception>
    /// <exception cref="ArgumentNullException">Thrown when <paramref name="onHalfOpen"/> is <see langword="null"/>.</exception>
    public static AsyncCircuitBreakerPolicy<TResult> AdvancedCircuitBreakerAsync<TResult>(this PolicyBuilder<TResult> policyBuilder, double failureThreshold, TimeSpan samplingDuration, int minimumThroughput, TimeSpan durationOfBreak, Action<DelegateResult<TResult>, CircuitState, TimeSpan, Context> onBreak, Action<Context> onReset, Action onHalfOpen)
    {
        var resolutionOfCircuit = TimeSpan.FromTicks(AdvancedCircuitController<EmptyStruct>.ResolutionOfCircuitTimer);

        if (failureThreshold <= 0)
        {
            throw new ArgumentOutOfRangeException(nameof(failureThreshold), "Value must be greater than zero.");
        }

        if (failureThreshold > 1)
        {
            throw new ArgumentOutOfRangeException(nameof(failureThreshold), "Value must be less than or equal to one.");
        }

        if (samplingDuration < resolutionOfCircuit)
        {
            throw new ArgumentOutOfRangeException(nameof(samplingDuration), $"Value must be equal to or greater than {resolutionOfCircuit.TotalMilliseconds} milliseconds. This is the minimum resolution of the CircuitBreaker timer.");
        }

        if (minimumThroughput <= 1)
        {
            throw new ArgumentOutOfRangeException(nameof(minimumThroughput), "Value must be greater than one.");
        }

        if (durationOfBreak < TimeSpan.Zero)
        {
            throw new ArgumentOutOfRangeException(nameof(durationOfBreak), "Value must be greater than zero.");
        }

        if (onBreak == null)

View on GitHub (pinned to d0e46bdb1e)

Solutions

1. Pass a fraction in (0,1]; divide percentages by 100.
2. Clamp configured value to (0,1] at startup.

Example fix

// before
.AdvancedCircuitBreakerAsync(failureThreshold: 100, ...)

// after
.AdvancedCircuitBreakerAsync(failureThreshold: 1.0, ...)

if (failureThreshold is <= 0 or > 1)
    throw new ArgumentOutOfRangeException(nameof(failureThreshold), "failureThreshold must be in (0,1].");

static bool IsValidFailureThreshold(double t) => t > 0 && t <= 1;

When it happens

Trigger: Calling AdvancedCircuitBreakerAsync(failureThreshold: 100, ...) treating the value as a percent. The check is `failureThreshold > 1`.

Common situations: Passing a percentage integer instead of a fraction.

Related errors

• Value must be greater than zero.
• Value must be greater than one.
• Value must be greater than zero.
• Value must be greater than zero.
• Value must be less than or equal to one.

AI-assisted analysis of App-vNext/Polly@d0e46bdb1e (2026-08-13). Data as JSON: /api/errors/5007ea42cd8a2b53. Report an issue: GitHub.