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Different behaviour for connection through RDP to machine with enabled 802.1x via wireless and via wired network on Windows 7

1 I have machine which is connected via wireless and via wired network adapter to some network.
2 802.1x is configured for both wireless and wired network adapters
3 User1 is logged on Computer1, but do not work at it at the moment. The screen of Computer1 is locked.
4 The OS of Computer1 is Windows 7 SP1 64
5 Computer2 is home computer of User1 and is connected to corporate network through VPN
6 User1 is member of the group Network1
7 Group Network1 is configured on RADIUS server to give access to 192.168.0.1 network
8 Wired network adapter have IP 192.168.0.2
9 Wireless network adapter have IP 192.168.0.3
10 Both Wireless and wired network adapter are set to User or Computer authentication
11 Computer1 is part of AD domain
12 Computer1 is NOT member of group Network1


Scenario1
Step1. User1 try to connect to Computer1 via RDP from Computer2 and use IP address of Wireless network adapter of Computer1 192.168.0.3
Step2. The connection attempt succeed and User1 can work on Computer1 via RDP from Computer2 without problems

Scenario2
Step1. User1 try to connect to Computer1 via RDP from Computer2 and use IP address of Wired network adapter of Computer1 192.168.0.2
Step2. The connection attempt to Computer1 doesn't succeed. Ethernet adapter of Computer1 receive IP from unauthorized network.

Assumption1
When Connecting via RDP to computer through Wireless network adapter - user 802.1x authentication take place.
Assumption2
When Connecting via RDP to computer though Wired network adapter - ONLY computer authentication take place, inspite both user and computer authentication is set in properties of wired network adapter.

Question1
Why behavior of Wireless and Wired network adapters in these scenarios differ?
Question2
Are there any security reasons in difference of this behavior?
Question3
How to force Windows 7 to not authenticate by computer authentication when connecting through wired network?

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