Thunderbolt Ethernet bridge not recognised

I have an original Apple Thunderbolt Ethernet bridge (TEB) for my brand new MBP 13" retina Mid 2014 edition and I am running Yosemite 10.10.2. I connect to the internet via ethernet regularly to play online video games. I recently plugged in my TEB and found that it wasn't connecting me to the internet. I checked network preferences and tried to run diagnostics but in the network preferences it says there is nothing plugged into the Thunderbolt port. However, when I go to system information and under the hardware tab I selected Thunderbolt, with the TEB connected there is a little drop down menu named Thunderbolt bus and under it it says Thunderbolt to Gigabit Ethernet Adapter. If I remove the TEB, this drop down option is not there, which gives me the impression that the computer is recognising the TEB, but somehow something is wrong with the software that isn't allowing me to connect.
Further information before any of you suggest something simple because I've tried all the simple solutions
I went to the apple store with my TEB and asked them to check if it was working, they confirmed that there is nothing wrong.
I've also used a brand new ethernet cable, one that I know is working to connect to the modem. And obviously my internet is working because otherwise I wouldnt be writing this.
So if anyone knows what I can do to fix this problem please help!
I've used the app EtreCheck and here were the results, doesn't seem like anything is wrong
Problem description:
Thunderbolt Ethernet bridge not working to connect to internet
EtreCheck version: 2.1.8 (121)
Report generated 28 Mar 2015 12:46:55 CET
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    MacBook Pro (Retina, 13-inch, Mid 2014) (Technical Specifications)
    MacBook Pro - model: MacBookPro11,1
    1 2.6 GHz Intel Core i5 CPU: 2-core
    8 GB RAM Not upgradeable
        BANK 0/DIMM0
            4 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            4 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless:  en0: 802.11 a/b/g/n/ac
    Battery Health: Normal - Cycle count 79
Video Information: ℹ️
    Intel Iris
        Color LCD spdisplays_2560x1600Retina
System Software: ℹ️
    OS X 10.10.2 (14C1514) - Time since boot: 1:35:6
Disk Information: ℹ️
    APPLE SSD SM0256F disk0 : (251 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
        [redacted]'s Mac (disk1) / : 249.78 GB (63.80 GB free)
            Encrypted AES-XTS Unlocked
            Core Storage: disk0s2 250.14 GB Online
USB Information: ℹ️
    Apple Internal Memory Card Reader
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Inc. Apple Internal Keyboard / Trackpad
    Logitech USB-PS/2 Optical Mouse
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
        Apple Inc. Thunderbolt to Gigabit Ethernet Adapter
Gatekeeper: ℹ️
    Mac App Store and identified developers
Launch Agents: ℹ️
    [loaded]    com.google.keystone.agent.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.google.keystone.daemon.plist [Click for support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.valvesoftware.steamclean.plist [Click for support]
User Login Items: ℹ️
    Flux    Application  (/Applications/Flux.app)
    iTunesHelper    Application  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Dropbox    Application  (/Applications/Dropbox.app)
    Basis Sync    Application  (/Applications/Basis Sync.app)
Internet Plug-ins: ℹ️
    FlashPlayer-10.6: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    Flash Player: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    o1dbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    SharePointBrowserPlugin: Version: 14.4.8 - SDK 10.6 [Click for support]
    googletalkbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
Safari Extensions: ℹ️
    AdBlock
3rd Party Preference Panes: ℹ️
    Flash Player  [Click for support]
Time Machine: ℹ️
    Auto backup: YES
    Volumes being backed up:
        Zimo's Mac: Disk size: 249.78 GB Disk used: 185.98 GB
    Destinations:
        Backup [Local]
        Total size: 200.00 GB
        Total number of backups: 4
        Oldest backup: 2014-12-29 22:43:52 +0000
        Last backup: 2015-02-23 10:08:15 +0000
        Size of backup disk: Too small
            Backup size 200.00 GB < (Disk used 185.98 GB X 3)
Top Processes by CPU: ℹ️
         4%    Google Chrome
         4%    WindowServer
         0%    fontd
         0%    AppleSpell
         0%    hidd
Top Processes by Memory: ℹ️
    326 MB    com.apple.WebKit.WebContent
    215 MB    Google Chrome
    120 MB    mds_stores
    120 MB    WindowServer
    86 MB    Finder
Virtual Memory Information: ℹ️
    1.02 GB    Free RAM
    4.60 GB    Active RAM
    1.94 GB    Inactive RAM
    1.03 GB    Wired RAM
    3.38 GB    Page-ins
    66 KB    Page-outs
Diagnostics Information: ℹ️
    Mar 28, 2015, 11:11:39 AM    Self test - passed
    Mar 28, 2015, 10:16:32 AM    /Library/Logs/DiagnosticReports/com.apple.WebKit.WebContent_2015-03-28-101632_[ redacted].cpu_resource.diag [Click for details]
    Mar 25, 2015, 01:18:58 PM    /Library/Logs/DiagnosticReports/iTunes_2015-03-25-131858_[redacted].cpu_resourc e.diag [Click for details]

I have an original Apple Thunderbolt Ethernet bridge (TEB) for my brand new MBP 13" retina Mid 2014 edition and I am running Yosemite 10.10.2. I connect to the internet via ethernet regularly to play online video games. I recently plugged in my TEB and found that it wasn't connecting me to the internet. I checked network preferences and tried to run diagnostics but in the network preferences it says there is nothing plugged into the Thunderbolt port. However, when I go to system information and under the hardware tab I selected Thunderbolt, with the TEB connected there is a little drop down menu named Thunderbolt bus and under it it says Thunderbolt to Gigabit Ethernet Adapter. If I remove the TEB, this drop down option is not there, which gives me the impression that the computer is recognising the TEB, but somehow something is wrong with the software that isn't allowing me to connect.
Further information before any of you suggest something simple because I've tried all the simple solutions
I went to the apple store with my TEB and asked them to check if it was working, they confirmed that there is nothing wrong.
I've also used a brand new ethernet cable, one that I know is working to connect to the modem. And obviously my internet is working because otherwise I wouldnt be writing this.
So if anyone knows what I can do to fix this problem please help!
I've used the app EtreCheck and here were the results, doesn't seem like anything is wrong
Problem description:
Thunderbolt Ethernet bridge not working to connect to internet
EtreCheck version: 2.1.8 (121)
Report generated 28 Mar 2015 12:46:55 CET
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
Click the [Click for details] links for more information about that line.
Hardware Information: ℹ️
    MacBook Pro (Retina, 13-inch, Mid 2014) (Technical Specifications)
    MacBook Pro - model: MacBookPro11,1
    1 2.6 GHz Intel Core i5 CPU: 2-core
    8 GB RAM Not upgradeable
        BANK 0/DIMM0
            4 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            4 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless:  en0: 802.11 a/b/g/n/ac
    Battery Health: Normal - Cycle count 79
Video Information: ℹ️
    Intel Iris
        Color LCD spdisplays_2560x1600Retina
System Software: ℹ️
    OS X 10.10.2 (14C1514) - Time since boot: 1:35:6
Disk Information: ℹ️
    APPLE SSD SM0256F disk0 : (251 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted>  [Recovery]: 650 MB
        [redacted]'s Mac (disk1) / : 249.78 GB (63.80 GB free)
            Encrypted AES-XTS Unlocked
            Core Storage: disk0s2 250.14 GB Online
USB Information: ℹ️
    Apple Internal Memory Card Reader
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Inc. Apple Internal Keyboard / Trackpad
    Logitech USB-PS/2 Optical Mouse
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
        Apple Inc. Thunderbolt to Gigabit Ethernet Adapter
Gatekeeper: ℹ️
    Mac App Store and identified developers
Launch Agents: ℹ️
    [loaded]    com.google.keystone.agent.plist [Click for support]
Launch Daemons: ℹ️
    [loaded]    com.adobe.fpsaud.plist [Click for support]
    [loaded]    com.google.keystone.daemon.plist [Click for support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Click for support]
User Launch Agents: ℹ️
    [loaded]    com.adobe.ARM.[...].plist [Click for support]
    [loaded]    com.valvesoftware.steamclean.plist [Click for support]
User Login Items: ℹ️
    Flux    Application  (/Applications/Flux.app)
    iTunesHelper    Application  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Dropbox    Application  (/Applications/Dropbox.app)
    Basis Sync    Application  (/Applications/Basis Sync.app)
Internet Plug-ins: ℹ️
    FlashPlayer-10.6: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    QuickTime Plugin: Version: 7.7.3
    Flash Player: Version: 17.0.0.134 - SDK 10.6 [Click for support]
    Default Browser: Version: 600 - SDK 10.10
    o1dbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
    SharePointBrowserPlugin: Version: 14.4.8 - SDK 10.6 [Click for support]
    googletalkbrowserplugin: Version: 5.40.2.0 - SDK 10.8 [Click for support]
Safari Extensions: ℹ️
    AdBlock
3rd Party Preference Panes: ℹ️
    Flash Player  [Click for support]
Time Machine: ℹ️
    Auto backup: YES
    Volumes being backed up:
        Zimo's Mac: Disk size: 249.78 GB Disk used: 185.98 GB
    Destinations:
        Backup [Local]
        Total size: 200.00 GB
        Total number of backups: 4
        Oldest backup: 2014-12-29 22:43:52 +0000
        Last backup: 2015-02-23 10:08:15 +0000
        Size of backup disk: Too small
            Backup size 200.00 GB < (Disk used 185.98 GB X 3)
Top Processes by CPU: ℹ️
         4%    Google Chrome
         4%    WindowServer
         0%    fontd
         0%    AppleSpell
         0%    hidd
Top Processes by Memory: ℹ️
    326 MB    com.apple.WebKit.WebContent
    215 MB    Google Chrome
    120 MB    mds_stores
    120 MB    WindowServer
    86 MB    Finder
Virtual Memory Information: ℹ️
    1.02 GB    Free RAM
    4.60 GB    Active RAM
    1.94 GB    Inactive RAM
    1.03 GB    Wired RAM
    3.38 GB    Page-ins
    66 KB    Page-outs
Diagnostics Information: ℹ️
    Mar 28, 2015, 11:11:39 AM    Self test - passed
    Mar 28, 2015, 10:16:32 AM    /Library/Logs/DiagnosticReports/com.apple.WebKit.WebContent_2015-03-28-101632_[ redacted].cpu_resource.diag [Click for details]
    Mar 25, 2015, 01:18:58 PM    /Library/Logs/DiagnosticReports/iTunes_2015-03-25-131858_[redacted].cpu_resourc e.diag [Click for details]

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