Problem in Configuring Software Repository

Dear all

There is a problem that I have.

I have Installed agent in all of the computers which have joined to the Domain.
I want to create a package to Install a software on computers.
As i have to first configure the software repository In "Software Development Tab-->Network Share--> Create Type: choose an Existing Share--> Browse" I can see my Domain Name but while I click on the +beside it to list my computers under it, it gives me a message which is "The list of servers for this work group is not currently available"

Also I Enabled the check box of the "Accessing the share using credential" and I have entered the Username and passwoed.

Please guide me that what should I do to solve this problem

Thanks in Advance
Negin