# OpcAuthenticationLimits Class

<span class="api-meta">since v2.50</span>

<dl class="api-definition">
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.server">Opc.UaFx.Server</a></dd>
<dt>Assembly</dt>
<dd>Opc.UaFx.Advanced.dll</dd>
<dt>Package</dt>
<dd>Opc.UaFx.Advanced v2.59.0</dd>
<dt>Members</dt>
<dd><a href="./members">OpcAuthenticationLimits Members</a></dd>
</dl>

Provides authentication options used by a server application instance to control the limits of authentications between the opponent applications.

## Syntax

<div class="api-signature" data-lang="csharp">

```csharp
public class OpcAuthenticationLimits
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Class OpcAuthenticationLimits
```

</div>

## Inheritance

[Object](https://learn.microsoft.com/dotnet/api/system.object) → **OpcAuthenticationLimits**

## Properties

| Name | Description |
|---|---|
| [AutoDetermineLimits](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcauthenticationlimits/members#autodeterminelimits) | Gets or sets a value indicating whether the server has to automatically determine feasible authentication limits according to available system ressources. |
| [Delay](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcauthenticationlimits/members#delay) | Gets or sets the base delay that is applied after the threshold of failed login attempts is exceeded. |
| [DelayWindow](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcauthenticationlimits/members#delaywindow) | Gets or sets the time window in which failed login attempts are counted. |
| [MaxConcurrentAttempts](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcauthenticationlimits/members#maxconcurrentattempts) | Gets or sets the limit for concurrent authentication attempts across the server. |
| [MaxConcurrentAttemptsPerIdentity](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcauthenticationlimits/members#maxconcurrentattemptsperidentity) | Gets or sets the maximum number of concurrent authentication attempts permitted per identity. |
| [MaxDelay](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcauthenticationlimits/members#maxdelay) | Gets or sets the maximum delay that can be applied after repeated failed attempts. |
| [MaxFailedAttempts](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcauthenticationlimits/members#maxfailedattempts) | Gets or sets the maximum number of failed login attempts allowed within the time window before a delay or rejection is enforced. |
| [MaxLockoutRecords](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.server.opcauthenticationlimits/members#maxlockoutrecords) | Gets or sets the maximum number of lockout records that can be maintained concurrently. |

## Applies to

| Package | Versions |
|---|---|
| Opc.UaFx.Advanced | v2.50–v2.59 |