Minor problems with SAMBA

For more information about SAMBA-general Linux technology-Linux technology and application, see the following. The configuration of the samba server is very simple without any restrictions.

First case:

Access samba through Windows XP and access through \ IP. Enter the username and password and log on to the samba server.

Problem 1: When you click share folder in samba, the server will ask me to enter the user name and password again (the shared folder has no policy)
Problem 2: After you enter the correct user name and password, you still cannot enter the shared folder. You need to press enter n times before entering the shared folder. Sometimes an error is reported directly, telling me that access is denied due to insufficient permissions, and then directly accessing the folder ....

Case 2:
When you access the samba server through a network neighbor, the following error occurs: you do not have the permission to access network resources.

Case 3:
You can use a Windows 7 PC to access samba without any problems. Is it an operating system problem ????