> ## Documentation Index
> Fetch the complete documentation index at: https://fastmcp-ts.docs.prefect.io/llms.txt
> Use this file to discover all available pages before exploring further.

# VerificationUnavailableError

Defined in: [server/auth/types.ts:72](https://github.com/PrefectHQ/fastmcp-ts/blob/main/src/server/auth/types.ts#L72)

Verification could not establish whether the credential is valid.
HTTP requests fail with 503, without a bearer challenge or dispatch.
The public message is fixed; diagnostic details belong in `cause`.

## Extends

* `Error`

## Constructors

### Constructor

```ts theme={null}
new VerificationUnavailableError(options?): VerificationUnavailableError;
```

Defined in: [server/auth/types.ts:76](https://github.com/PrefectHQ/fastmcp-ts/blob/main/src/server/auth/types.ts#L76)

#### Parameters

##### options?

###### cause?

`unknown`

###### retryAfter?

`string` | `null`

#### Returns

`VerificationUnavailableError`

#### Overrides

```ts theme={null}
Error.constructor
```

## Properties

### retryAfterSeconds?

```ts theme={null}
readonly optional retryAfterSeconds?: number;
```

Defined in: [server/auth/types.ts:74](https://github.com/PrefectHQ/fastmcp-ts/blob/main/src/server/auth/types.ts#L74)

Retry delay in seconds, limited to five minutes.


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