|License Type||SaaS & On-Premise|
|Agent Mode||Assess & Protect|
|Main Product Category||.NET Agent|
In rare scenarios, bad instrumentation causes a web server process to crash or a specific page to error out. If you ever encounter a crash or error caused by Contrast, please report the error via the Submit a Request link at the bottom of this page. If possible, follow the steps below to gather agent logs and process dumps; this additional information is vital to reproducing and fixing these types of bugs.
Agent Logs Directory
The .NET agent logs information to the LOGS directory within C:\ProgramData\Contrast\dotnet\, the Windows 2008/2012/2016 ProgramData directory. Depending on the setup of the Windows profile and folder view settings, the directories may be hidden. If so, paste the paths into the Windows Explorer location; you may need to replace the drive letter C with D.
You can change which information is logged by setting the logging level in your contrast_security.yaml file to TRACE:
Types of Bugs
There are two primary types of agent bugs for which Contrast needs to gather logs and other information:
- Process Crash
- Unhandled Managed Exception/Page Error/500
Process Crash Bugs
Verify that the web server process crashed
Check your scenario against the following indicators to confirm that the web server process crashed.
The web application is unresponsive after installing the .NET agent.
The Windows Event Log (Event Viewer > Windows Logs > Application) has Error entries for the
- The ".NET Runtime" error has details such as:
Framework Version: v4.0.30319
Description: The process was terminated due to an internal error in the .NET Runtime at IP XXXXXXXXX with exit code YYYYYYY
The "Application Error" entry has details similar to:
Faulting application name: w3wp.exe, version: 8.5.9600.16384, time stamp: 0x5215df96 Faulting module name: clr.dll, version: 4.7.2114.0, time stamp: 0x59a63e48 Exception code: 0xc0000005 Fault offset: 0x00000000002ff61c Faulting process id: 0x3724 Faulting application start time: 0x01d337d711f21e68 Faulting application path: c:\windows\system32\inetsrv\w3wp.exe Faulting module path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\clr.dll Report Id: 4fc99650-a3ca-11e7-80e8-005056bd4248
- The ".NET Runtime" error has details such as:
Once you confirm that the observed bug is a process crash, you're ready to gather information to file a bug.
Gather information on the process crash
Complete the following steps to gather information to send to Contrast.
- Set up the ProcDump utility to capture crash dump.
- Download current version of ProcDump from the Microsoft documentation site to the Windows server with the agent.
- From an administrator command prompt:
md c:\dumps procdump.exe -ma -i c:\dumps
- Install the latest .NET agent.
- Stop the .NET agent service.
- Enable additional logging.
- Start > Notepad > Right click > Run as Administrator
- File > Open > C:\ProgramData\Contrast\dotnet\contrast_security.yaml
- Add the following configuration to the yaml file to enable verbose logging and logging of every method JIT-compiled by the CLR:
level: TRACE secret: log_method_sigs: true
- Start the .NET agent service.
- Exercise the application to reproduce the crash.
Once you've reproduced the crash, gather the following items and include them in your bug report:
- Agent Logs: All files in the agent log directory, C:\ProgramData\Contrast\dotnet\LOGS; right click on the LOGS folder > Send To > Compressed (zip) folder.
- Windows Event Log: Event Viewer > Windows Logs > Application > Save All Events As > "MyEvents.evtx"
- Crash Dumps: Create a zip file of each w3wp process dump file in C:\dumps (e.g., w3wp.exe_171002_151601.dmp). Dump files can be quite large.
You can then uninstall ProcDump with
Unhandled Managed Exception or Page Error Bugs
Verify an unhandled exception
The above process also helps the .NET engineering team resolve issues such as application errors caused by the .NET agent. Use the following indicators to determine if the .NET agent is causing an application error.
- You've observed the application working normally without the agent.
- You've observed a page of the application "crashing" (returning a 500 error) under the agent.
- There are no errors for ."NET Runtime" and "Application Error" in the Windows Event Log.
- There may be warnings for "ASP.NET" in the Windows Event Log. The warning should look similar to the following:
Source: ASP.NET 4.0.30319.0 Date: 10/9/2017 9:22:46 AM Event ID: 1309 Task Category: Web Event Level: Warning Keywords: Classic User: N/A Computer: FOO.COMPUTER.COM Description: Event code: 3005 Event message: An unhandled exception has occurred. Event time: 09/10/2017 9:22:46 AM Event time (UTC): 09/10/2017 2:22:46 PM Event ID: f706787c1f1247e6a87b777a90413c3d Event sequence: 9 Event occurrence: 1 Event detail code: 0 Application information: Application domain: /LM/W3SVC/1/ROOT/FOO-1-131520325424796488 Trust level: Full Application Virtual Path: /Foo Application Path: E:\MCMSFiles\inetpub\wwwroot\Foo\ Machine name: FOO Process information: Process ID: 176840 Process name: w3wp.exe Account name: System Exception information: Exception type: ArgumentOutOfRangeException Exception message: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index at System.Collections.ArrayList.get_Item(Int32 index) at System.Web.UI.WebControls.DataListItemCollection.get_Item(Int32 index) at Fabrikam.SetTabCount(Int32 index, NullableInt32 summaryCount) in C:\Foo\Fabrikam.aspx.cs:line 1686 at Fabrikam.GetSummaryCounts() in C:\Foo\Fabrikam.aspx.cs:line 1468 at Fabrikam.OnPreRender(EventArgs e) in C:\Foo\Fabrikam.aspx.cs:line 549 at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) Request information: Request URL: https://www.foo-staging.com/Foo/Fabrikam.aspx Request path: /Foo/Fabrikam.aspx User host address: 126.96.36.199 User: msteeber Is authenticated: True Authentication Type: Thread account name: System Thread information: Thread ID: 19 Thread account name: System Is impersonating: False Stack trace: at System.Collections.ArrayList.get_Item(Int32 index) at System.Web.UI.WebControls.DataListItemCollection.get_Item(Int32 index) at Fabrikam.SetTabCount(Int32 index, NullableInt32 summaryCount) in C:\Foo\Fabrikam.aspx.cs:line 1686 at Fabrikam.GetSummaryCounts() in C:\Foo\Fabrikam.aspx.cs:line 1468 at Fabrikam.OnPreRender(EventArgs e) in C:\Foo\Fabrikam.aspx.cs:line 549 at System.Web.UI.Control.PreRenderRecursiveInternal() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
As the process hasn't crashed, ProcDump won't capture process dumps. Instead, you must gather the process dump manually by completing the following steps.
Find the Process ID of the worker process that you need.
IIS Manager > Worker Processes: Find the "Application Pool Name" you need, and take note of the value in the "Process Id".
From an administrator command prompt, replace
NNNNNwith the process ID from the previous step.
C:\>procdump -ma NNNNN
Follow a similar process to gather agent logs, windows events and process dumps to include with your bug report.
If you encountered a bug other than a process crash or unhandled exception - maybe the .NET Tray has an inaccurate state, or the agent found a false positive - please contact us via the Submit a Request link at the bottom of this page. Contrast doesn't usually need process dumps, but trace-level logs and a detailed description of the problem are very helpful when it's time to fix these bugs.