Sharepoint 2013 search error: The crawler could not communicate with the server

wherever you get this error message in sharepoint 2013 search:

The crawler could not communicate with the server. Check that the server is available and that the firewall access is configured correctly.

the 1st thing that means is that the crawler just failed to get the page.

but before you're running to the IIS and FW, you should just think about Permission.

and that 1st of all means that everything is Published!

Steps:
1. publish everything, incuding Master pages, Page Layouts, ect.
2. make sure the user running the search crawler has Read Permissions to that web.
3. if not the above, do check the IT stuff like communications and FW.

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