Hi,
>When we try to access the web service, no response is received
If you don't have read access on site then you can not use lists.asmx service directly but you also have option to pass authentication when access this site. This is line where you actually use default or can pass username and password and domain name in
that.
/*Authenticate the current user by passing their default
credentials to the Web service from the system credential cache.*/
listService.Credentials =
System.Net.CredentialCache.DefaultCredential
Check this MSDN article to access list through service and update the item in list:
http://msdn.microsoft.com/en-us/library/ms440289.aspx
http://msdn.microsoft.com/en-us/library/lists.lists.updatelistitems.aspx
Hope it could help
Cheers, Hemendra-MCTS "Yesterday is just a memory,Tomorrow we may never see"