Crawler could not communicate with the server in SharePoint 2016

Question

I have farm where I have two application with search servers. It is stretched farm and unfortunately one data center is down since few days. So this is what I see when I access search service application:

I would expect that it won't impact my search as another application server is fully operational. Unfortunately when I go to Crawl log I see only errors with information that crawler could not communicate with the server.

My question is why crawler is trying to use wrong server and how can I make it work? I wasn't able to find any valuable article describing this topic. Do you have any tips regarding this issue?

Thanks in advance.

Answer 1

You need to check does the site properly resolves from the crawler server (even by simply opening the IE or using PING) to see to what IP the url resolves. You might have some entries in the HOST file that point it to the front end server in failed DC.