So it's failing when ISA tries to perform pass through authentication (the DsCrackName is an RPC call to the DC) - is there anything in the Event Viewer indicating a problem on the ISA Server? Check both System and Security logs. Are you Domain Controllers running Win2003? Do they have Service Pack 1 installed?
If so, have you installed ISA 2004 Service Pack 1?
HI clindt Now, i can conect by username administrator but i can not conect by user test. And when i make conection if i use administrator@mydomain.com so i can not conect too. i don't known what's happent? can you explain to me? thanks.
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If you have windows xp sp2, then the problem is that with ipsec\l2tp connection behind nat are not supported, to fix this problem, adding the following registry key:
1. Click Start, click Run, type regedit, and then click OK. 2. Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\IPsec 3. On the Edit menu, point to New, and then click DWORD Value. 4. In the New Value #1 box, type AssumeUDPEncapsulationContextOnSendRule, and then press ENTER. 5. Right-click AssumeUDPEncapsulationContextOnSendRule, and then click Modify. 6. In the Value Data box, type one of the following values: ò 0 (default) A value of 0 (zero) configures Windows so that it cannot establish security associations with servers that are located behind network address translators. ò 1 A value of 1 configures Windows so that it can establish security associations with servers that are located behind network address translators. ò 2 A value of 2 configures Windows so that it can establish security associations when both the server and the Windows XP SP2-based client computer are behind network address translators.
7. Click OK, and then quit Registry Editor. 8. Restart the computer.
That's not the issue - he's is failing the user authentication piece - L2TP/IPSec must be online first before user authentication can take place.
As he said in his last post - he can connect with Administrator, but not other accounts so this rules out the AssumeUDPEncapsulation... registry entry.
We'd need to see the IASSAM log from the time the Administrator connects vice when the test user attempts to connect.
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RE: vpn authentication problem - 
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