# OpcClient.ServerInterfaces Property

<dl class="api-definition">
<dt>Type</dt>
<dd><a href="./">OpcClient</a></dd>
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx.client">Opc.UaFx.Client</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">OpcClient Members</a></dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

<span class="api-meta">since v2.8</span>

Gets a collection of OPC Classic interfaces supported by the server and used by the client. The general available interfaces are listed in the [OpcClassicInterfaces](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.classic.opcclassicinterfaces/) class.

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

```csharp
public OpcClassicInterfaceCollection ServerInterfaces { get; }
```

</div>

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

```vbnet
Public ReadOnly Property ServerInterfaces As OpcClassicInterfaceCollection
```

</div>

**Property value**

[OpcClassicInterfaceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.classic.opcclassicinterfacecollection/)

An instance of the [OpcClassicInterfaceCollection](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.classic.opcclassicinterfacecollection/) items are used when accessing an OPC Classic server.

**Remarks**

Preselecting the interfaces provided by a server will significantly improve the performance when connecting to an OPC Classic server, because of the supported interfaces will then not queried first via OPC Classic discovery.