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For me my password was spelled wrong and It couldn't connect to the SCCM server. To resolve this issue, you must correctly configure the System Center Configuration Manager 2007 client network access account. To do this, follow these steps:

1.Use an account that has administrative permissions to log on to a computer that has the System Center Configuration Manager 2007 Administrator Console installed.
2.Click Start, click All Programs, click Systems Management Server, and then click SMS Administrator Console.
3.Expand ServerName, expand Site Management, expand SiteName, and then expand Site Settings.
4.Click Client Agents, right-click Computer Client Agent, and then click Properties.
5.In the Computer Client Agent Properties dialog box, next to the network access account that you want to configure, click Set.
6.In the Windows User Account dialog box, enter the user name and the password that you want to use for the network access account, and then click OK two times.