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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsIIS error 0x80070057 means “The parameter is incorrect,” but the code alone does not identify which parameter or component failed. It is a Win32 error that IIS can surface while parsing configuration, loading a module, selecting a handler, or processing a request. The reliable fix is to capture the complete IIS error details, identify the named section or module, validate the merged configuration, and then correct only the setting that the evidence points to.
Do not start by changing random Web.config values or reinstalling IIS. Work from the HTTP status and substatus, HRESULT, module, notification stage, handler, site, source file, and line number shown by the error page, then confirm the finding in logs or tracing.
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What IIS 0x80070057 means
Windows defines hexadecimal 0x80070057 as ERROR_INVALID_PARAMETER, displayed as “The parameter is incorrect.” In IIS, that message is a symptom emitted by whichever component is handling the request. It is not a universal diagnosis and does not prove that one particular Web.config setting is wrong.
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- Malformed XML or an invalid element or attribute in
ApplicationHost.configor a distributedWeb.config. - An unrecognized section or module reference copied from a different server.
- A missing or inaccessible DLL, executable, script processor, content path, or other configured file.
- A module or handler whose bitness does not match the application pool.
- A setting that a parent configuration level has locked.
- A module-stage failure, such as a request reported by
FastCgiModule, where the HRESULT by itself is insufficient to identify the bad value.
A Microsoft Q&A case shows FastCgiModule returning HTTP 500 with 0x80070057. That report does not establish one universal FastCGI fix; the module name and request-stage details must be investigated on the affected server.
Capture the complete failure before editing anything
Reproduce the same request once and save the complete IIS error response. A cropped screenshot containing only “The parameter is incorrect” removes the information needed to choose a safe fix. Record these fields exactly:
- HTTP status and substatus, such as the 500 family code and any secondary value.
- The HRESULT, including the full
0x80070057value. - Module name and notification stage.
- Handler name, if one is shown.
- Site, application, virtual directory, and URL that triggered the response.
- Source file and line number.
- The complete “Config Source” excerpt, including the line IIS marks.
- Timestamp, application pool, client location, and whether the request was local to the server.
Reproduce locally where possible. A local request helps separate a server configuration problem from a proxy, load balancer, or remote-share issue. At the same timestamp, check the IIS log and Event Viewer for IIS and Windows Process Activation Service (WAS) events. Microsoft’s IIS support guidance uses these records to distinguish invalid configuration from later module or request-processing failures.
Understand IIS’s configuration hierarchy
IIS does not read only the Web.config next to your application. It merges a server-level file with distributed files lower in the site tree:
C:WindowsSystem32inetsrvConfigApplicationHost.configsupplies server-wide settings.- A site-level
Web.configcan add or override settings for that site. - An application-level file can add another layer.
- Parent-directory files can affect a virtual directory or child application.
A local file can therefore look valid while inheriting an invalid or locked setting from a parent. Conversely, a change that appears harmless in one application can affect every site if it is made in ApplicationHost.config. Inspect the exact file and line named by IIS, then inspect parent files when the local entry appears correct.
Check the XML and names first
Open the relevant configuration in a text editor that shows line numbers and look for an unclosed element, mismatched quotation mark, duplicate entry, misspelled element or attribute, or a section that is not installed on this server. Microsoft lists malformed XML and unrecognized sections or modules among common IIS 500.19 configuration failures. Do not delete an entire section merely because one child entry is suspect; preserve unrelated settings and correct the smallest invalid fragment.
Look for configuration copied from another machine
Configuration exported from another server can reference a module, handler, feature, path, or setting that is absent or differently configured on the current server. Compare the named section and module with the features actually installed on this machine before copying more settings into the file.
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Inspect effective settings with AppCmd
Use an elevated Command Prompt to inspect what IIS has actually assembled after inheritance:
%windir%system32inetsrvappcmd list config /section:system.webServerAppCmd is intended to inspect IIS’s effective configuration. Its output can show whether a value comes from the local file or an inherited level and can expose a stale module, duplicate collection entry, or invalid section that is not obvious when viewing one Web.config in isolation. Narrow the inspection to the affected site, application, and section using AppCmd’s configuration-target options, then compare the result with the source file and the “Config Source” line in the error page.
Run the command from an elevated prompt. If AppCmd itself reports that a section is unknown or cannot be read, treat that as evidence about the IIS feature or configuration state rather than as a reason to keep editing the application file.
Follow the module, handler, or notification named in the error
The named component tells you where IIS stopped. A configuration-parsing error points toward XML, section names, inheritance, and locks. A module-loading or handler-stage error points toward installation, paths, permissions, and bitness. A response-stage failure may require request tracing instead of another configuration edit.
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FastCGI and script processors
If the page names FastCgiModule, inspect the FastCGI application and the handler that invokes it. Verify that the configured script processor or executable exists at the exact path, that its arguments are valid for this application, and that the application-pool identity can read and execute it. Check the IIS log, Event Viewer, and a Failed Request Trace for the same URL; the HRESULT alone cannot tell you whether the executable path, handler mapping, permissions, or another value is responsible.
Native modules, URL Rewrite, compression, and authentication extensions
For any named native module or extension, confirm that the IIS feature or module is installed and that every referenced DLL exists at the configured location. A reference left behind after an uninstall can make configuration invalid even though the application files themselves are present. If the module is installed but fails only for one application pool, check the pool’s bitness against the module’s bitness. Microsoft identifies invalid or missing DLL references and bitness mismatches as separate IIS configuration failure causes.
Handlers
Check the handler mapping that IIS reports. Confirm its verb and path pattern, the executable or script processor it calls, and the module it uses. A handler copied from another server may name a processor that is not installed here. Correct the mapping at the level permitted by your configuration policy rather than adding a second, conflicting entry.
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Verify every path and permission
Once the error identifies a file, directory, executable, or DLL, verify the complete path character by character. Check the following:
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- The script processor, FastCGI executable, or native DLL exists at the configured path.
- Configuration files can be read by the application-pool identity.
- The content and executable directories grant the required read and execute access.
- A UNC or remote-share path is reachable and has both share and NTFS permissions for the identity IIS uses.
Do not test only with your administrator account. IIS usually accesses application files as the application-pool identity or another configured service account, so an administrator’s successful file browse does not prove that the worker process can open the same file. A missing path and an access-denied path can produce similar symptoms; the IIS error details and Event Viewer entry help distinguish them.
Check for locked sections
A site or application Web.config can fail when it tries to override a section locked at a parent level. This is common when a server administrator has deliberately centralized settings. The child file may be syntactically correct and still be rejected because policy forbids changing that section below the parent.
Use the error’s section name and AppCmd’s effective configuration output to determine whether the setting is inherited and locked. If policy permits, unlock the section with IIS Manager or AppCmd at the appropriate parent level. If it does not, remove the lower-level override and configure the value where policy allows it. Do not unlock a section merely to make one application start; a parent lock may protect every application on the server.
Use logs and Failed Request Tracing for stage-specific failures
Enable Failed Request Tracing for the affected status when the problem is intermittent, occurs only for certain URLs, or identifies a module but not the failing value. Reproduce the request and correlate the trace with:
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- The IIS log entry for the exact timestamp and URL.
- HTTPERR data for connection or request failures reported below IIS.
- Event Viewer entries from IIS and WAS.
- The application’s own log, if the request reaches the application.
The trace should show the request stage at which processing stops and which module last handled it. In the documented FastCGI case, collecting tracing and HTTP error data was necessary because 0x80070057 alone did not establish the cause. Disable or narrow tracing after diagnosis if your operational policy requires it.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Choose the narrowest correction
Use the evidence to decide the scope and reversibility of the change. This comparison keeps a plausible fix from becoming an unnecessarily broad server change:
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| Where the failure appears | Most useful evidence | First correction to consider | Scope and risk |
|---|---|---|---|
| Configuration parsing | Source file, line number, and Config Source excerpt | Fix malformed XML, an invalid attribute, duplicate entry, or unrecognized section | Usually one file or section; preserve unrelated settings |
| Module loading | Named module, DLL path, Event Viewer entry | Install the required feature, correct the path, or remove a stale reference | May affect a site or the whole server depending on where the module is registered |
| Handler or FastCGI execution | Handler/module name, executable path, trace stage | Correct the handler, script processor, arguments, permissions, or pool bitness | Usually application or site specific; retest the same URL |
| Inherited setting or lock | Effective AppCmd output and section name | Move the setting to the permitted level or remove the child override | Parent-level changes can affect multiple applications |
| Intermittent request stage | Failed Request Trace, IIS log, HTTPERR, and Event Viewer correlation | Correct the exact module, path, or request condition shown by the trace | Avoid speculative global edits until the trace identifies a cause |
Before changing ApplicationHost.config or a production Web.config, make a dated backup copy and record the original location. Apply one narrow change at a time so a successful retest identifies which correction mattered and a failed retest can be reverted cleanly.
Retest and confirm the result
- Restart the affected application pool, or IIS only when the change requires it.
- Submit the same URL, method, and relevant parameters that produced 0x80070057.
- Check the new HTTP status, substatus, module, notification stage, and handler.
- Confirm that the IIS log and Event Viewer no longer show the original failure at the same timestamp.
- If a different error appears, treat it as the next diagnostic layer rather than assuming the first change failed. For example, resolving a configuration parse error can expose a subsequent permission or application error.
If the server cannot load IIS configuration after an edit, restore the backup of the affected file, confirm that XML is well formed, and then inspect the parent-level configuration and installed modules before attempting another change. Avoid replacing the entire configuration with a file from another server; that can introduce new section, path, feature, and lock conflicts.
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An unclosed or misspelled XML element
The error page points to a line in Web.config or ApplicationHost.config. Correct the closing tag or spelling, save a backup of the original, and retest the same request. If the line looks correct, inspect the preceding lines for an unclosed element because XML parsers often report the point where they can no longer continue.
An unrecognized module or section
Confirm that the IIS feature or extension named by the section is installed on this server. If the application does not use it, remove the stale reference at the appropriate configuration level. Do not copy a registration blindly from another machine with different IIS features.
A missing DLL or executable
Correct the configured path or restore the required component through the application’s supported installation process. Then verify that the application-pool identity can read and execute it. A path that works interactively for an administrator may still fail for the worker process.
A 32-bit/64-bit mismatch
Compare the application-pool bitness setting with the module or executable’s bitness. Align them according to the component’s supported configuration, then recycle the pool and retest. If the error remains, use tracing and Event Viewer rather than changing unrelated Web.config sections.
A locked child setting
Identify the locked section, remove the child override, or obtain the required parent-level change from the server administrator. Unlocking a section changes the policy boundary for every application beneath that level, so it is not a neutral workaround.
A FastCGI-only HTTP 500
Capture the full module and notification information, verify the script processor path and permissions, inspect the handler mapping and pool bitness, and run Failed Request Tracing for the failing status. The label FastCgiModule narrows the stage but does not identify one guaranteed edit.
When the HRESULT is not enough
There is no single command or one-line fix that is safe for every IIS 0x80070057 report. The correct remedy depends on the IIS version, application type, module or handler named in the response, configuration hierarchy, and request that triggers the error. Treat forum anecdotes as leads only. The server’s own error page, effective configuration, logs, Event Viewer entries, and trace should determine the final change.
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