domain based webservice connection problem

When I try to connect domain based webservice from my system getting "The request failed with HTTP status 401: Unauthorized" error .What could be the problem.

When i browse the service from browser(http://10.1.23.4/gss/myManagerService.asmx) i can see the service output but when i try to connect from my below programe getting 401 error.
Please advice me.


MyService service= new MyService ();
System.Net.CredentialCache cache = new System.Net.CredentialCache();
cache.Add(new Uri("http://10.1.23.4/gss/myManagerService.asmx"), new System.Net.NetworkCredential("muusername", "mypwd","mydomain"));
service.Url = "http://10.1.23.4/gss/myManagerService.asmx";
int cnt = 0;
myrec[] records = new myrec[0];
AccRecord oaccRecord = new AccRecord ();

DateTime enddt = DateTime.Now;
DateTime stdt = DateTime.Now.AddDays(-10);

service.Credentials = cache;
MessageBox.Show("service");
records =service.ReadRecord(records , stdt, enddt);// here taking some time and throwing 401 eroor

Please use CODE TAGS

Code:

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' new System.Net.NetworkCredential("muusername", "mypwd","mydomain"));

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I'd guess that the problem might lie in that statement...

my guess not code problem when i use same code for other service its working fine but the other service reside on not domain based server.
so my code like this new System.Net.NetworkCredential("user", "pwd") no domain name.

only problem with domain based server .
do i need to do any settings any where?