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copied!<p>Seems a bit strange, but the solution was to create a separate class library and make reference to its DLL in my WCF service.</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IdentityModel.Selectors; using System.IdentityModel.Tokens; using System.ServiceModel; /// <summary> /// Summary description for CustomUsernamePasswordValidator /// </summary> namespace CustomValidator { public class CustomUserNameValidator : UserNamePasswordValidator { public override void Validate(string userName, string password) { if (null == userName || null == password) { throw new ArgumentNullException(); } if (!AuthenticateUser(userName, password)) throw new SecurityTokenValidationException("Invalid Credentials"); else { // do nothing - they're good } } public bool AuthenticateUser(string userName, string password) { if (userName != "userbill" || password != "passwordbill") { return false; } else { return true; } } } } </code></pre> <p>I then made added a reference to System.IdentityModel and System.ServiceModel. </p> <p>The serviceCredentials section for the WCF service is now changed to this:</p> <pre><code><serviceCredentials>  <userNameAuthentication userNamePasswordValidationMode="Custom" customUserNamePasswordValidatorType="CustomValidator.CustomUserNameValidator, CustomValidator"/> </serviceCredentials> </code></pre> <p>Hope that helps someone.</p> <p>I tried this with invalid credentials, and was expecting to see my "Invalid Credentials" message. Instead I'm getting "At least one security token in the message could not be validated."</p> <p>Other than that this thing is finally up and running!</p>

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