c# - UserPrincipal with context that uses SSL

I have a PrincipalContext that uses SSL. This works fine when using a method like Context.ValidateCredentials(). But when I need to find a user using UserPrincipal.FindByIdentity() I get the following error:

System.Runtime.InteropServices.COMException: The server is unwilling to process the request.
at System.DirectoryServices.DirectoryEntry.Bind(Boolean throwIfFail)
at System.DirectoryServices.DirectoryEntry.Bind()
at System.DirectoryServices.DirectoryEntry.get_SchemaEntry()
at System.DirectoryServices.AccountManagement.ADStoreCtx.IsContainer(DirectoryEntry de)
at System.DirectoryServices.AccountManagement.ADStoreCtx..ctor(DirectoryEntry ctxBase, Boolean ownCtxBase, String username, String password, ContextOptions options)
at System.DirectoryServices.AccountManagement.PrincipalContext.CreateContextFromDirectoryEntry(DirectoryEntry entry)
at System.DirectoryServices.AccountManagement.PrincipalContext.DoLDAPDirectoryInit()
--- End of inner exception stack trace ---
at System.DirectoryServices.AccountManagement.PrincipalContext.DoLDAPDirectoryInit()
at System.DirectoryServices.AccountManagement.PrincipalContext.DoDomainInit()
at System.DirectoryServices.AccountManagement.PrincipalContext.Initialize()
at System.DirectoryServices.AccountManagement.PrincipalContext.get_QueryCtx()
at System.DirectoryServices.AccountManagement.Principal.FindByIdentityWithTypeHelper(PrincipalContext context, Type principalType, Nullable`1 identityType, String identityValue, DateTime refDate)
at System.DirectoryServices.AccountManagement.Principal.FindByIdentityWithType(PrincipalContext context, Type principalType, String identityValue)
at System.DirectoryServices.AccountManagement.UserPrincipal.FindByIdentity(PrincipalContext context, String identityValue)

My method:

public List GetUserInfo(string user) {
        var list = new List();
        using (var context = new PrincipalContext(ContextType.Domain, "xxxx.xxxx.xxxx:636", "DC=xxxx,DC=xxxx,DC=xxxx", ContextOptions.SimpleBind | ContextOptions.Sealing | ContextOptions.SecureSocketLayer)) {
            var uP = UserPrincipal.FindByIdentity(context, IdentityType.SamAccountName, user);
            //Do stuff with uP
        return list;
    }

But this is working fine:

public bool ValidateCredentials(string username, string password) {
        using (var context = new PrincipalContext(ContextType.Domain, "xxxx.xxxx.xxxx:636", "DC=xxxx,DC=xxxx,DC=xxxx", ContextOptions.SimpleBind | ContextOptions.Sealing | ContextOptions.SecureSocketLayer)) {
            return context.ValidateCredentials(username, password);
        }
    }

How come I cant work with UserPrincipal using the Context with SSL? If I remove SSL it works fine..