We're having the same issue on an a few systems running Windows 10 build 1511 with eap-gtc tracing enabled. Each time one attempts to authenticate the agent (appears) to crash
The eap-gtc tracing output and a crash log follow.
[5828] 04-27 18:24:44:979: DllMain :: enabled log(eap-gtc) with version: 2.00.0.0011 [RELEASE]
[5828] 04-27 18:24:44:979: RasEapCreateConnectionProperties(6, 128, A6EC4710, 0, 0, 36F7B5E8, 36F7B660) :: Enter
[5828] 04-27 18:24:44:979: RasEapCreateConnectionProperties() :: *ppConnectionDataOut 0xA4F7B440, *pdwSizeOfConnectionDataOut: 776, returning with NO_ERROR
[5828] 04-27 18:24:45:526: DllMain :: enabled log(eap-gtc) with version: 2.00.0.0011 [RELEASE]
[5828] 04-27 18:24:45:526: RasEapCreateConnectionProperties(6, 128, A6DA2EC0, 0, 0, 36F7BD28, 36F7BDA0) :: Enter
[5828] 04-27 18:24:45:526: RasEapCreateConnectionProperties() :: *ppConnectionDataOut 0xA4F711E0, *pdwSizeOfConnectionDataOut: 776, returning with NO_ERROR
[3052] 04-27 18:24:48:534: DllMain :: enabled log(eap-gtc) with version: 2.00.0.0011 [RELEASE]
[3052] 04-27 18:24:48:534: RasEapCreateConnectionProperties(6, 128, A6DA2AD0, 0, 0, 36BFBE18, 36BFBE90) :: Enter
[3052] 04-27 18:24:48:534: RasEapCreateConnectionProperties() :: *ppConnectionDataOut 0xA4EE2830, *pdwSizeOfConnectionDataOut: 776, returning with NO_ERROR
[6040] 04-27 18:24:48:696: DllMain :: enabled log(eap-gtc) with version: 2.00.0.0011 [RELEASE]
[6040] 04-27 18:24:48:696: RasEapCreateConnectionProperties(6, 128, A6DA2F30, 0, 0, 36FFB838, 36FFB8B0) :: Enter
[6040] 04-27 18:24:48:696: RasEapCreateConnectionProperties() :: *ppConnectionDataOut 0xA4F5A130, *pdwSizeOfConnectionDataOut: 776, returning with NO_ERROR
[5828] 04-27 18:24:48:868: DllMain :: enabled log(eap-gtc) with version: 2.00.0.0011 [RELEASE]
[5828] 04-27 18:24:48:868: RasEapCreateConnectionProperties(6, 128, A6DA3010, 0, 0, 36F7BE88, 36F7BF00) :: Enter
[5828] 04-27 18:24:48:868: RasEapCreateConnectionProperties() :: *ppConnectionDataOut 0xA4EE26E0, *pdwSizeOfConnectionDataOut: 776, returning with NO_ERROR
[5828] 04-27 18:27:00:556: DllMain :: enabled log(eap-gtc) with version: 2.00.0.0011 [RELEASE]
[5828] 04-27 18:27:00:556: RasEapCreateConnectionProperties(6, 128, A6E870E0, 0, 0, 36F7BD28, 36F7BDA0) :: Enter
[5828] 04-27 18:27:00:556: RasEapCreateConnectionProperties() :: *ppConnectionDataOut 0xA4F5AA90, *pdwSizeOfConnectionDataOut: 776, returning with NO_ERROR
[6040] 04-27 18:27:04:930: DllMain :: enabled log(eap-gtc) with version: 2.00.0.0011 [RELEASE]
[6040] 04-27 18:27:04:930: RasEapCreateConnectionProperties(6, 128, A6DA2D70, 0, 0, 36FFB838, 36FFB8B0) :: Enter
[6040] 04-27 18:27:04:930: RasEapCreateConnectionProperties() :: *ppConnectionDataOut 0xA4F5AA90, *pdwSizeOfConnectionDataOut: 776, returning with NO_ERROR
[6040] 04-27 18:28:00:013: DllMain :: enabled log(eap-gtc) with version: 2.00.0.0011 [RELEASE]
[6040] 04-27 18:28:00:013: RasEapCreateConnectionProperties(6, 128, A6DA2EC0, 0, 0, 36FFB838, 36FFB8B0) :: Enter
[6040] 04-27 18:28:00:013: RasEapCreateConnectionProperties() :: *ppConnectionDataOut 0xA4F5AA90, *pdwSizeOfConnectionDataOut: 776, returning with NO_ERROR
[6040] 04-27 18:29:00:043: DllMain :: enabled log(eap-gtc) with version: 2.00.0.0011 [RELEASE]
[6040] 04-27 18:29:00:043: RasEapCreateConnectionProperties(6, 128, A6DA2DE0, 0, 0, 36FFB838, 36FFB8B0) :: Enter
[6040] 04-27 18:29:00:043: RasEapCreateConnectionProperties() :: *ppConnectionDataOut 0xA4F5AA90, *pdwSizeOfConnectionDataOut: 776, returning with NO_ERROR
Log Name: Application
Source: Application Error
Date: 4/27/2016 6:25:12 PM
Event ID: 1000
Task Category: (100)
Level: Error
Keywords: Classic
User: N/A
Computer: DESKTOP-Q335HOK
Description:
Faulting application name: LegacyNetUXHost.exe, version: 10.0.10586.0, time stamp: 0x5632d75d
Faulting module name: eap-gtc.dll, version: 2.0.0.11, time stamp: 0x545712fa
Exception code: 0xc0000005
Fault offset: 0x000000000000384e
Faulting process id: 0x14ec
Faulting application start time: 0x01d1a0dbfdec6608
Faulting application path: C:\windows\system32\LegacyNetUXHost.exe
Faulting module path: C:\Windows\System32\eap-gtc.dll
Report Id: 40712efd-0c31-4a4c-9993-abd0c1ef6047
Faulting package full name:
Faulting package-relative application ID:
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Application Error" />
<EventID Qualifiers="0">1000</EventID>
<Level>2</Level>
<Task>100</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2016-04-27T23:25:12.832948000Z" />
<EventRecordID>760</EventRecordID>
<Channel>Application</Channel>
<Computer>DESKTOP-Q335HOK</Computer>
<Security />
</System>
<EventData>
<Data>LegacyNetUXHost.exe</Data>
<Data>10.0.10586.0</Data>
<Data>5632d75d</Data>
<Data>eap-gtc.dll</Data>
<Data>2.0.0.11</Data>
<Data>545712fa</Data>
<Data>c0000005</Data>
<Data>000000000000384e</Data>
<Data>14ec</Data>
<Data>01d1a0dbfdec6608</Data>
<Data>C:\windows\system32\LegacyNetUXHost.exe</Data>
<Data>C:\Windows\System32\eap-gtc.dll</Data>
<Data>40712efd-0c31-4a4c-9993-abd0c1ef6047</Data>
<Data>
</Data>
<Data>
</Data>
</EventData>
</Event>