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You will probably need to create a firewall exception rule to allow the drive to map. Finding what port is getting blocked when trying to map the drive will be the tricky part. I would try some of the built in firewall exceptions and see if you have any luck. This page has some good info on configuring exceptions. <br />
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<a href="http://www.microsoft.com/windowsxp/using/networking/security/winfirewall.mspx" rel="ugc nofollow">http://www.microsoft.com/windowsxp/using/networking/security/winfirewall.mspx</a>
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You will probably need to create a firewall exception rule to allow the drive to map. Finding what port is getting blocked when trying to map the drive will be the tricky part. I would try some of the built in firewall exceptions and see if you have any luck. This page has some good info on configuring exceptions.

http://www.microsoft.com/windowsxp/using/networking/security/winfirewall.mspx [http://www.microsoft.com/windowsxp/using/networking/security/winfirewall.mspx]

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When users log into our Terminal Server via RDP / VPN, there Terminal Server login script maps a drive (X:) to a local C: share. &nbsp;<br />
The login script mapping syntax is as follows: <br />
'net use x: \\%clientname%\TSImages'. &nbsp;<br />
TSIMages is the Share Point on the users local C:\ drive. &nbsp;We've installed new Windows XP Security Patches &amp;&nbsp;now the share will not map when the users log into their Termincal Server Session. &nbsp;Turning OFF the Windows Firewall on the users workstaion allows the share to map in the Terminal Server Session. &nbsp;What would be blocking the drive mapping in the Firewall?
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When users log into our Terminal Server via RDP / VPN, there Terminal Server login script maps a drive (X:) to a local C: share.  
The login script mapping syntax is as follows: 
'net use x: \\%clientname%\TSImages'.  
TSIMages is the Share Point on the users local C:\ drive.  We've installed new Windows XP Security Patches & now the share will not map when the users log into their Termincal Server Session.  Turning OFF the Windows Firewall on the users workstaion allows the share to map in the Terminal Server Session.  What would be blocking the drive mapping in the Firewall?

Windows XP Firewall blocks RDP session share mapping

Remote access may refer to the connection to a data-processing system from a remote location, for example through a virtual private network remote desktop software, terminal emulation, or the activation of features of a business telephone system from outside the business's premises.

Remote Access

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

Microsoft Windows XP is the sixth release of the NT series of operating systems, and was the first to be marketed in a variety of editions: XP Home and XP Professional, designed for business and power users. The advanced features in XP Professional are generally disabled in Home Edition, but are there and can be activated. There were two 64-bit editions, an embedded edition and a tablet edition.