When you start Crawl on SPS 2003 "The address could not be found, (0x80041209 - Cannot Connect to the server. Please make sure the site is accessible. )"

When you try to run the Crawl in the SharePoint Portal server 2003 you see
Gatherer log shows:
The address could not be found, (0x80041209 - Cannot Connect to the server. Please make sure the site is accessible. )

First try to browse the site from the Web front end servers.
Run the PROXYCFG from all the SharePoint servers including Index server
Run PROXYCFG -u to uninstall the Proxy setting from the Registry and IE

After running the above command you still get the same error then follow the next steps
Try browsing the site from the index server, and you will get an "Page not Found"
When you ping with site name, that will fail
Run NSLookup on site from the index server
Ping the IP which is resolved using the NSLookup, and you should be successful
Add the IP to the hosts file in C:\Windows\System32\Drivers\etc
Now you should be able to browse the site from the index server
Now you should be able to start the crawling on the SharePoint Server 2003  successfully