One day you decide you feel like searching your SharePoint 2007 site for some content and you come across the following errors:

On the site page:

The search request was unable to connect to the Search Service. 

In the event log:

Event Type: Error
Event Source: Office Server Search
Event Category: Content index server 
Event ID: 4127
Date: 08/01/2009
Time: 20:41:13
User: N/A
Computer: SERVER01
Description:
Content index on Portal_Content could not be initialized. Error The content index is corrupt.   0xc0041800.Component: 1a42c22a-da49-4651-80ab-99f19176ac8a
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

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Event Type: Warning
Event Source: Office Server Search
Event Category: Search service 
Event ID: 10039
Date: 08/01/2009
Time: 20:43:42
User: N/A
Computer: SERVER01
Description:
Retry of query machine ‘SERVER01′ has failed with error: The object is not initialzed.   0×8004180b.  It will be retried again in 900 seconds. Component: 1a42c22a-da49-4651-80ab-99f19176ac8a
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.

To Resolve this issue you need to Reset all crawled content. To do this perform the following steps:

1. Open SharePoint Central Administration.
2. On the top nav bar, click Application Management.
3. On the Application Management page, click Create or configure this farm’s shared services.
4. On the Manage this Farms Shared Services page, click the SSP whoes administration page you want to open.
5. On the Shared Services Administration Home page, click Search settings in the Search section.
6. On the Configure Search Settings page, click Reset all crawled content in the Crawl Settings section.
7. By default, the Deactivate search alerts during reset check box is selected on the Reset Crawled Content page. This option prevents users who have search alerts configured from being sent unnecessary e-mail messages when the crawled content is reset. Click to clear this check box if you do not want to disable alerts during the reset operation.
8. Click Reset Now.
9. In the message box, click OK to confirm that you want to reset the search content index.
10. Go back to the Shared Services Administration Home page, click Search settings in the Search section.
11. Click Content sources and crawl schedules.
12. Drop the menu down for the Source you want to crawl, click Start Full Crawl.

Once the crawl completes you should be all good again.

Happy Searching.