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Please have a look to the link below, It is about your error of authentication<br />
<a href="http://support.microsoft.com/kb/939820" rel="ugc nofollow">http://support.microsoft.com/kb/939820</a><br />
good luck
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Please have a look to the link below, It is about your error of authentication
http://support.microsoft.com/kb/939820 [http://support.microsoft.com/kb/939820]
good luck

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My problem relates to XP this relates to Vista 
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My problem relates to XP this relates to Vista

<div>
Hi TomPreen,<br />
<br />
Microsoft has release a patch that is not available with windows update to fix this problem. &nbsp;You must<br />
manually request this patch to fix this specified problem. &nbsp;The installation of this patch requires a <br />
reboot. &nbsp;You can request this patch by going to:<br />
<br />
<a href="http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=953760&kbln=en-us" rel="ugc">http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=953760&kbln=en-us</a>&nbsp; 
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Hi TomPreen,

Microsoft has release a patch that is not available with windows update to fix this problem.  You must
manually request this patch to fix this specified problem.  The installation of this patch requires a
reboot.  You can request this patch by going to:

http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=953760&kbln=en-us [http://support.microsoft.com/hotfix/KBHotfix.aspx?kbnum=953760&kbln=en-us] 

<div>
No solution was required because requirement was abandoned
</div>


No solution was required because requirement was abandoned

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<div class="content wysiwyg-content">
I have problems with a remote connection from my XP system to a remote SBS Server.<br />
<br />
Initially I was unable to make the VPN connection because whilst I had service pack 3 installed I had not enabled network level authentication. Having edited the registry to allow this the VPN connection works but RDP fails with an authentication error 0X80090303
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</div>


I have problems with a remote connection from my XP system to a remote SBS Server.

Initially I was unable to make the VPN connection because whilst I had service pack 3 installed I had not enabled network level authentication. Having edited the registry to allow this the VPN connection works but RDP fails with an authentication error 0X80090303

XP RDP authentication error

A virtual private network (VPN) is a network that uses a public telecommunication infrastructure, such as the Internet, to provide remote offices or travelling users access to a central organizational network securely. VPNs encapsulate data transfers using secure cryptographic methods and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be intercepted.

The Microsoft Legacy Operating System topic includes legacy versions of Microsoft operating systems prior to Windows 2000: All versions of MS-DOS and other versions developed for specific manufacturers and Windows 3/3.1, Windows 95 and Windows 98, plus any other Windows-related versions, and Windows Mobile.