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Unable to capture live traffic on docking station

Seems to only work on wifi.  Does not work when I use a thunderbolt docking station with built in ethernet.


netcore.log:

at netcore.log 

[2020-11-03 10:59:24:651] [Information] [Fiddler] !ERROR - Fiddler Acceptor failed to AcceptConnection: System.ObjectDisposedException Cannot access a disposed object.

Object name: 'System.Net.Sockets.Socket'.

[2020-11-03 10:59:28:399] [Information] [Fiddler] !WARNING: The Default Gateway information could not be obtained.

[2020-11-03 10:59:28:444] [Information] [Fiddler] !WARNING: The Default Gateway information could not be obtained.

[2020-11-03 10:59:29:083] [Information] [Angular] Requesting shared item ID.

[2020-11-03 10:59:29:121] [Information] [Angular] The app will be loaded without navigating to a shared item.

[2020-11-03 10:59:29:141] [Information] [Angular] SignalR HubConnection connected successfully.

[2020-11-03 10:59:29:172] [Information] [Angular] WebSocket opened ws://localhost:5742/ws/sessionListData

[2020-11-03 10:59:29:174] [Information] [Angular] Has Internet Access during the user service creation: true.

[2020-11-03 10:59:29:187] [Information] [Angular] Logged in from the amplify SDK.

[2020-11-03 10:59:29:188] [Information] [Angular] Received id Token. Had existing tokens: 'false'. Is new token: 'true'. Index in history: '0'. Total tokens in history: '1'.

[2020-11-03 10:59:29:188] [Information] [Angular] Token assumed as outdated or risky.

[2020-11-03 10:59:29:189] [Information] [Angular] Will try to refresh user's token

[2020-11-03 10:59:29:909] [Information] [Angular] Starting a new backend login.

[2020-11-03 10:59:29:909] [Information] [Angular] New idToken successfully taken.

[2020-11-03 10:59:29:909] [Information] [Angular] Received id Token. Had existing tokens: 'true'. Is new token: 'true'. Index in history: '0'. Total tokens in history: '2'.

[2020-11-03 10:59:29:909] [Information] [NETCore] Initializing user specific directories.

[2020-11-03 10:59:29:977] [Information] [NETCore] Initializing settings service.

[2020-11-03 10:59:29:978] [Information] [NETCore] Ensuring latest settings.

[2020-11-03 10:59:29:979] [Information] [NETCore] Loading transcoders.

[2020-11-03 10:59:30:038] [Information] [NETCore] Initializing certificates manager.

[2020-11-03 10:59:30:108] [Information] [NETCore] Initializing proxy manager.

[2020-11-03 10:59:30:108] [Information] [NETCore] Starting proxy manager.

[2020-11-03 10:59:30:457] [Information] [Fiddler] !WARNING: Failed to get proxy information for Connection 'OSX Default' due to System.ArgumentOutOfRangeException Specified argument was out of the range of valid values. (Parameter 'i')

[2020-11-03 10:59:30:458] [Information] [Fiddler] !WARNING: The Default Gateway information could not be obtained.

[2020-11-03 10:59:30:459] [Information] [Fiddler] Error: Failed to register Fiddler as the system proxy.

[2020-11-03 10:59:30:460] [Information] [NETCore] Logging to backend service.

[2020-11-03 10:59:30:464] [Information] [NETCore] Creating new backend SDK instance.

[2020-11-03 10:59:30:476] [Information] [NETCore] Getting UserClient instance.

[2020-11-03 10:59:30:665] [Information] [NETCore] Getting the user info.

[2020-11-03 10:59:31:369] [Information] [NETCore] Getting JamSessionsClient instance.

[2020-11-03 10:59:31:371] [Information] [NETCore] Getting RuleSetsClient instance.

[2020-11-03 10:59:31:371] [Information] [NETCore] Getting SnapshotClient instance.

[2020-11-03 10:59:31:372] [Information] [NETCore] Getting ComposerCollectionClient instance.

[2020-11-03 10:59:31:372] [Information] [NETCore] Getting QuotaClient instance.

[2020-11-03 10:59:31:372] [Information] [NETCore] Getting LicenseClient instance.

[2020-11-03 10:59:31:372] [Information] [NETCore] Getting AccountClient instance.

[2020-11-03 10:59:31:373] [Information] [NETCore] Getting SubscriptionClient instance.

[2020-11-03 10:59:31:373] [Information] [NETCore] Getting NotificationObservable instance.

[2020-11-03 10:59:31:501] [Information] [NETCore] Initializing composer collections service.

[2020-11-03 10:59:31:784] [Information] [NETCore] Updating local quotas.

[2020-11-03 10:59:32:037] [Information] [Angular] Backend login successfully finished.

[2020-11-03 10:59:32:197] [Information] [Angular] WebSocket opened ws://localhost:5742/ws/uiState

[2020-11-03 10:59:32:325] [Information] [Angular] CleverTap analytics successfully initialized.

[2020-11-03 10:59:32:325] [Information] [Angular] Successfully set current user information in CleverTap.

[2020-11-03 10:59:32:963] [Information] [NETCore] Getting downloaded composer collections.

[2020-11-03 10:59:35:709] [Information] [Fiddler] !WARNING: Failed to get proxy information for Connection 'OSX Default' due to System.ArgumentOutOfRangeException Specified argument was out of the range of valid values. (Parameter 'i')

[2020-11-03 10:59:35:709] [Information] [Fiddler] !WARNING: The Default Gateway information could not be obtained.

[2020-11-03 10:59:35:709] [Information] [Fiddler] Error: Failed to register Fiddler as the system proxy.

[2020-11-03 10:59:35:717] [Error] [Angular] Failed to toggle capturing

[2020-11-03 10:59:37:335] [Information] [NETCore] Getting downloaded composer collections.


electron.log:

2020-11-03 10:59:24:656] [info] Closing server...

[2020-11-03 10:59:24:671] [info] Application exited with code 0.

[2020-11-03 10:59:26:661] [info] [Product information] Fiddler Everywhere 1.2.0

[2020-11-03 10:59:26:670] [info] [System information] Darwin MACLAP-2XLMD6R.lan 19.6.0 Darwin Kernel Version 19.6.0: Mon Aug 31 22:12:52 PDT 2020; root:xnu-6153.141.2~1/RELEASE_X86_64 x86_64

[2020-11-03 10:59:26:765] [info] Initializing splash screen.

[2020-11-03 10:59:26:766] [info] Attempting to run server - 5 attempts left.

[2020-11-03 10:59:26:766] [info] Calculating the URL of ASP.NET Server application.

[2020-11-03 10:59:26:767] [info] Generating random port.

[2020-11-03 10:59:26:767] [info] Trying to start server at port [5742].

[2020-11-03 10:59:28:196] [info] Fetching .NET Core server status.

[2020-11-03 10:59:28:287] [info] Application successfully connected to .NET Core server [5742].

[2020-11-03 10:59:28:403] [info] Setting the following proxy settings to the main window: {"pacScript":null,"proxyRules":null,"proxyBypassRules":null}

[2020-11-03 10:59:28:417] [info] Loading application in window.

[2020-11-03 10:59:28:418] [info] Getting the URL of Angular application.

[2020-11-03 10:59:28:437] [info] Starting the app without a deep link.

[2020-11-03 10:59:28:438] [info] Maximizing application window.

[2020-11-03 10:59:28:874] [info] Destroying splash screen.

[2020-11-03 10:59:29:010] [info] Checking for update

[2020-11-03 10:59:29:552] [info] Update for version 1.2.0 is not available (latest version: 1.2.0, downgrade is disallowed).


Hey James,


Please provide a screenshot of your OS network preferences. Additionally, you could post the output from the following command:


networksetup -listnetworkserviceorder 


Refer to this KB article for more options to troubleshoot your macOS network settings, and if possible, post the output here so we could investigate your case.


1 person likes this

% networksetup -listnetworkserviceorder

An asterisk (*) denotes that a network service is disabled.

(1) USB 10/100/1000 LAN

(Hardware Port: USB 10/100/1000 LAN, Device: en7)


(2) Thunderbolt Ethernet Slot 1

(Hardware Port: Thunderbolt Ethernet Slot 1, Device: en8)


(3) Wi-Fi

(Hardware Port: Wi-Fi, Device: en0)


(4) Bluetooth PAN

(Hardware Port: Bluetooth PAN, Device: en6)


(5) Thunderbolt Bridge

(Hardware Port: Thunderbolt Bridge, Device: bridge0)

Hey James,


Could you let us know if the Fiddler proxy (from the screenshot > Advanced.. > Proxy it should be 127..0.0.1:8866 for Web proxy and Secure proxy) is being set for any of the active network adapters (when Fiddler Everywhere Capturing is turned on)?

The proxy is not being set for either my thunderbolt ethernet port or for wifi

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