c# qr code generator source Guidelines for Troubleshooting VPN Client Connections in C#.NET

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Guidelines for Troubleshooting VPN Client Connections
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Enabling VPN connectivity requires a complex interplay between several server components such as the ISA Server configuration and the RRAS configuration. In addition, you have several configuration options such as authentication methods and tunneling protocols. All these components and options must be configured correctly to allow users to connect to the ISA Server computer using a VPN. Use the following guidelines when troubleshooting VPN client connections:
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The most common problems with VPN connections are user authentication problems. Start by checking the user configuration. Does the user have permission to dial in Is the user part of a group that has permission to use VPN on the ISA Server computer Is the user account locked out Is the user using the correct password If the user account is not the problem, then check the authentication method configuration. If the user is connecting to a PPTP connection, ensure that the client and server share an authentication method. By default, ISA Server only enables MS-CHAP v2 authentication, so if users are using an older Windows client such as Windows 98 or Windows NT, they may not be able to support the authentication method. The best solution in this case is to install the appropriate security patches on the clients so they support MS-CHAP v2 authentication. If the users are connecting to an L2TP/IPSec connection, ensure that the client has the correct certificate installed or is configured to use the appropriate pre-shared key. L2TP/IPSec clients may also not be able to authenticate if ISA Server is configured to block IP fragments. In this scenario, users will get an error message that indicates that the security negotiation timed out. IPSec uses the Internet Key Exchange (IKE) protocol for mutual computer authentication and for the exchange of session keys in an L2TP VPN connection. The IKE negotiation information cannot fit inside an MTU. Because of this, the IKE negotiation packet is fragmented into smaller packets. When you filter fragmented packets in ISA Server, the IKE negotiation packets are dropped by ISA Server. Therefore, the VPN connection cannot be completed successfully. To enable client connections, you must configure ISA Server not to block IP fragments. If the users can connect to the VPN remote-access server and authenticate, but cannot get access to any network resources, check the name resolution for the
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Lesson 2
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Configuring Virtual Private Networking for Remote Clients
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VPN clients. The VPN clients must be configured with a DNS server (and possibly a WINS server) address to resolve server names on the internal network.
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If the DNS configuration is accurate, check the configuration of the access rules defined on the ISA Server computer. Remember that the VPN Clients network is used by ISA Server like any other network, so you must configure access rules in order to enable network traffic to flow between networks.
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Practice: Configuring Virtual Private Networking for Remote Clients
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In this practice, you will enable and configure VPN client remote access on ISA Server. You will then configure a remote VPN client and test the VPN connection.
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Exercise 1: Configuring VPN Client Access on ISA Server
1. On DC1, log on as Administrator. Open Active Directory Users And Computers from the Administrative Tools folder. 2. Click Users, and double-click RAS And IAS Servers. On the Members tab, click Add. 3. In the Select Users, Contacts, Computers Or Groups dialog box, click Object Types. 4. On the Object Types dialog box, click Computers, and then click OK. 5. In the Enter The Object Names To Select text box, type ISA1. Click OK. 6. Click OK to close the RAS And IAS Servers Properties dialog box. 7. On ISA1, log on as an ISA Server Administrator. 8. Open ISA Server Management, expand ISA1, and then select Virtual Private Networks (VPN). 9. In the task pane, on the Tasks tab, click Enable VPN Client Access. 10. On the Tasks tab, click Configure VPN Client Access. 11. In the VPN Client Properties dialog box, on the Groups tab, click Add. In the Select Groups dialog box, click Locations. 12. In the Locations dialog box, click cohovineyard.com and then click OK. 13. In the Enter The Object Names To Select field, type Managers. Click OK. 14. On the Protocols tab, ensure that only Enable PPTP is selected. 15. Click OK to close the VPN Clients Properties dialog box. 16. In the left pane, right-click Virtual Private Networks (VPN), and then click Properties. 17. In the Virtual Private Networks (VPN) Properties dialog box, on the Access Networks tab, notice that ISA Server is configured to accept only incoming VPN connections from the External network.
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