Access denied when crawling MOSS Content in crawl Log.

When you try to crawl the site content from central administration in MOSS, crawl log shows some errors for the site the site is not crawled properly.  

1. Access is denied. Verify that either the Default Content Access Account has access to this repository, or add a crawl rule to crawl this repository.

2. If the repository being crawled is a SharePoint repository, verify that the account you are using has "Full Read" permissions on the SharePoint
Web Application being crawled.

3. The item was deleted because it was either not found or the crawler was denied access to it.

Disable the Loop Back Check on the Windows Server, you can find the steps in this KB article
as well https://support.microsoft.com/kb/896861

You Can use the Below steps to resolve the issue

1. Click Start, click Run, type regedit, and then click OK.

2. In Registry Editor, locate and then click the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa

3. Right-click Lsa, point to New, and then click DWORD Value.

4. Type DisableLoopbackCheck, and then press ENTER.

5. Right-click DisableLoopbackCheck, and then click Modify.

6. In the Value data box, type 1, and then click OK.

7. Quit Registry Editor, and then restart your computer.