forms authentication blunder wcf

we joining wcf web use anonomous opening incited off, windows authentication incited on. web.config record internal user comment grant users countermand users="?".

i download beget use surrogate glorious (being influenced creds), however windows form digest (even flitting credentials), i following error:

system.servicemodel.security.messagesecurityexception unhandled
  message="the http ask unapproved fan authentication amour 'anonymous'. authentication header viewed server 'basic realm=\"seipart001\"'."

message="the remote server returned an error: (401) unauthorized."

here illustration code:

ip.eipcshoppingcartwssoapclient fan = new iparts.ip.eipcshoppingcartwssoapclient();
system.net.networkcredential creds = new system.net.networkcredential("username", "password", "domain");

client.clientcredentials.windows.clientcredential = creds;
iparts.ip.orderlistitem[] listitem = client.getorderlist("1234"); //throws difference here