Crawls successful, but cannot get ANY search results SharePoint 2016

Question

We are finishing up building a fresh SharePoint 2016 on-premise solution. Everything is working except search, which seems completely broken.

As far as we can tell all service account permissions are correct for search, but we can never get any results.

The crawling is successful, all of the websites get hit, but nothing ever comes out of the search regardless of the search term.

The only thing I can think is some obscure permissions issue or even though the websites are getting crawled their content is not getting indexed and is somehow unavailable for the most basic search or search itself is just wired up incorrectly.
 I loaded up the ULS Viewer and poked around and two things jumped out. The query seems to be going in, it just never has any results.

"Microsoft.Office.Server.Search.Query.Ims.ImsQueryInternal : Number of tables in Result: 4, Relevant Results: 0 (Total: 0, Total including duplicates: 0), Refinement Results: 0"

How can I verify there is any searchable content after a crawl? Also I now have 2 Search Service Applications and am not entirely sure how to wire these up to the different search boxes.

Any advice is greatly appreciated.

Answer 1

Where do the users search from? From search center or from a site search? Please offer a screenshot about the error page.

Try to create a new search center and search from the new search center, compare the results.

Make sure search related service is started.

Make sure your Search service application is connected to web applications.

Navigate to Central Admin > Application Management > Manage web applications >Highlight the web application > Select Service Connections from top ribbon > Make sure your Search service application is selected.

Answer 2

Please check your TCP IP 808 port configuration both in WFE and Application servers. Other Port need to be checked TCP 32843 and 32844

For all required port details in SharePoint 2016, please refer the below article :

https://blogit.create.pt/fabiocarvalho/2017/02/14/sharepoint-2016-tcpip-ports/