<p>I have a problem to connect to my WCF service if customer is using proxy with credentials. I'm unable to find the way to set credential to generated client proxy. </p>

<p>If I use the web service, then it is possible to set proxy. </p>

Not sure if this is what you are looking for but the below is a working code sample to authenticate using the client credentials.
```
```
Dim client As ProductServiceClient = New ProductServiceClient("wsHttpProductService")
    client.ClientCredentials.UserName.UserName = "username"
    client.ClientCredentials.UserName.Password = "password"
    Dim ProductList As List(Of Product) = client.GetProducts()
    mView.Products = ProductList
    client.Close()
```
```