---
title: Error or Document Not Found Page After Rebuilding the Indexes
slug: '2284'
canonical_url: https://docs.coveo.com/en/2284/
collection: coveo-for-sitecore-v5
source_format: adoc
---
# Error or Document Not Found Page After Rebuilding the Indexes
## Symptoms

After performing a rebuild of your indexes from the Indexing Manager (**Sitecore Desktop** > **Sitecore Start Menu** > **Control Panel** > **Indexing** > **Indexing Manager**), closing the window may redirect you to a `Document Not Found` or error page like this one:

```text
Server Error in '/' Application.
​
A potentially dangerous Request.Path value was detected from the client (:).
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
​
Exception Details: System.Web.HttpException: A potentially dangerous Request.Path value was detected from the client (:).
​
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
​
Stack Trace:
​
[HttpException (0x80004005): A potentially dangerous Request.Path value was detected from the client (:).]
   System.Web.HttpRequest.ValidateInputIfRequiredByConfig() +12352359
   System.Web.PipelineStepManager.ValidateHelper(HttpContext context) +166
​
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34212
```

## Cause

The admin session has expired and Sitecore won't allow you to continue using the Control Panel until you sign in again.
The error page is simply the result of a badly formatted URL inside Sitecore.

## Resolution

Just head back to the Sitecore Login page to re-enter your credentials.
The indexing process was most certainly performed correctly.