I'm trying to implement a custom Membership and Role provider to authenticate over WCF. I've got a breakpoint on my ValidateUser() Method in my custom MembershipProvider and as a test I'm always returning true. 

I'm using the Multiplex authentication as I have some site admins setup in the EPiServer DB and if I try to login using one of these site admins everything works fine. If however I try to login using a WCF based user I stay on the EPiServer Login Page, I don't receive any exceptions or a password invalid message.

Has anyone got any ideas of where I'm going wrong here?

 web.config

<roleManager enabled="true" cacheRolesInCookie="true" defaultProvider="MultiplexingRoleProvider">
			<providers>
				<clear/>

<add name="MultiplexingRoleProvider" provider1="SqlServerRoleProvider" provider2="WCFRoleProvider" providerMap1="SqlServerMembershipProvider" providerMap2="WCFMembershipProvider"  type="EPiServer.Security.MultiplexingRoleProvider, EPiServer"/>
				<add applicationName="MyApp" name="WCFRoleProvider" type="MyApp.Classes.WCFRoleProvider, MyApp"/>
			</providers>
		</roleManager>
<membership defaultProvider="MultiplexingMembershipProvider" userIsOnlineTimeWindow="10">

			<providers>
				<clear/>

 <add provider1="SqlServerMembershipProvider" provider2="WCFMembershipProvider" name="MultiplexingMembershipProvider" type="EPiServer.Security.MultiplexingMembershipProvider, EPiServer"/>
				<add name="WCFMembershipProvider" type="MyApp.Classes.WCFMembershipProvider, MyApp" />
			</providers>
		</membership>

WCFMembershipProvider.cs

public override bool ValidateUser(string username, string password)
        {
            bool isValid = true;
           
            return isValid;
        }

WCFRoleProvider.cs

public override string[] GetAllRoles()
        {
            return new string[2]{"WCFCustomer", "WCFBilling"};
        }

        public override string[] GetRolesForUser(string username)
        {
            if (username == "testWCFLogin")
            {

                return new string[1] { "WCFCustomer" };
            }
            else
            {
                return new string[0];
            }
        }