We have two farms, one dedicated crawl farm and one that hosts content.
We have two SSAs(SSAWebApp1 & SSAWebApp2) on the crawl farm, one for each web app(WebApp1 & WebApp2) on the content farm.
We want to setup the search center in WebApp1 to return results from both SSAs. However, when attempting to return results from the SSAWebApp2 we get 401 unauthorized. This is while using the farm service account.
I have already established the trust between farms. The SSAs both crawl content fine. From WA1 search returns results for WA1 without issue, and from WA2 search returns results for WA2 without issue. For troubleshooting purposes we even gave everyone full control over the published SSAs.
What is causing our 401 unauthorized errors?