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User receives the "No domain server was available to validate your password. You may not be able to access Network resources" error message
If users get this message during login, it means that the domain controller did not respond to the user's login before the login timed out.
Make sure you have IP connectivity to the network behind the Cisco VPN Concentrator after connecting with the Cisco VPN Client. As a test, try to ping the machines and your Primary Domain Controller (PDC) server on that LAN. If the ping in unsuccessful, refer to VPN Clients with Microsoft Routing Problems.
If Internet Control Message Protocol (ICMP) (the ping) is successful, check that the correct Windows Internet Naming Service (WINS) or Domain Name System (DNS) IP addresses were assigned to the client after connecting with the VPN Client.
Under Groups/Filters on the VPN Concentrator, make sure you do not have a filter setup that would block this traffic.
The error message can also occur when the VPN Client is getting its IP address from a Dynamic Host Configuration Protocol (DHCP) server or from an IP address pool. It may fail to log in to the Microsoft domain, and report the No domain server was available to validate your password error message.
This error message only occurs if the VPN Client is disconnected and the user tries to reconnect within 10 minutes. This error is due to the WINS server associating a previous login with a different IP address of the current connection. Once the WINS server times out the previous login (10 minutes), the VPN Client is able to successfully log in to the domain. Alternatively, each VPN Client user could be assigned a static IP address to avoid this issue.