c# .net print barcode Lesson 4 in C#

Generate QR in C# Lesson 4

Lesson 4
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Configuring VPN Quarantine Control
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10-51
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3. If the connection attempt matches the quarantine policy, the connection is accepted with quarantine restrictions, and the client is assigned an IP address and placed in the Quarantined VPN Clients network. At this point, the remote-access client can only connect to resources that are enabled by the firewall policy for the Quarantined VPN Clients network. The client has up to the number of seconds specified in the ISA Server quarantine properties to notify the computer running ISA Server that the script has run successfully. 4. After connecting, the CM profile on the VPN client runs the quarantine script. The quarantine script verifies that the remote-access client computer s configuration complies with network policy requirements. 5. If all the tests for network policy compliance pass, the script runs Rqc.exe with its command-line parameters, one of which is a text string for the version of the quarantine script included within the CM profile. Rqc.exe sends a notification to the computer running ISA Server, indicating that the script was successfully run. 6. The notification is received by the listener component (Rqs.exe) on ISA Server. The listener component verifies the script version string in the notification message with those configured in the registry and sends back either a message indicating that the script version was valid or a message indicating that the script version was invalid. If the script version was valid, the listener component informs ISA Server that the client has been accepted, which causes ISA Server to move the client from the Quarantined VPN Clients network to the VPN Clients network. The client can now access all resources that are accessible from the VPN Clients network.
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3 Client IP address is assigned to the Quarantined VPN Clients network
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ISA Server 6 5
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1 Client initiates the connection
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4 Remote Employee Client runs the quarantine script
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Client IP address is assigned to the VPN Clients network Client sends notification to the VPN server
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Figure 10-13
How network quarantine control works
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10
Configuring Virtual Private Networks for Remote Clients and Networks
How Network Quarantine Control Is Implemented Using ISA Server
Configuring quarantine control on ISA Server requires several configuration steps. Before you enable quarantine mode, you must complete the following steps: 1. Create a client-side script that will be used to validate the client configuration information. 2. Use CMAK to create a Connection Manager profile that includes a notification component and the client-side script. The notification component provides verification to the computer running ISA Server that the script has successfully run. If you do not want to create your own notification component, you can use Rqc.exe from the Windows Server 2003 Resource Kit. Distribute the CM profile to all users who need to access your network through the VPN connection. 3. Create and install a listener component on the ISA Server computer. The listener component is installed on the computer running ISA Server, and receives notification from the client that the script has successfully performed all configuration checks. After the listener component receives notification, it removes the client from quarantine mode, and the ISA Server computer moves the client IP address from the Quarantined VPN Clients network to the VPN Clients network. If you do not want to create your own listener component, you can use the Rqs.exe sample from the Windows Server 2003 Resource Kit. 4. Enable quarantine control on ISA Server. After completing all the previous steps, you can then enable quarantine control on ISA Server. When you enable quarantine for ISA Server, you can configure a time-out setting that specifies the amount of time a client attempting to create a VPN connection is allowed to remain in quarantine mode and an exception list of users to whom quarantine is not applied. Users in this list are automatically joined to the VPN Clients network. 5. Configure network rules and access rules for the Quarantined VPN Clients network. Before a client computer clears quarantine, the client s IP address is added to the Quarantined VPN Clients network. For the client to have access to any network resources, you need to configure network and access rules so that clients on this network can gain access to the internal network. At a minimum, you should configure the firewall policy so that the client can perform name resolution using DNS, obtain the latest version of the CM profile, or access instructions and components needed to make the remote-access client compliant with network policies. 6. Configure network rules and access rules for the VPN Clients network. After the client computer clears quarantine, the client IP address is moved to the VPN Clients network. To enable access to the internal network, you need to define access rules that enable the appropriate level of access.
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