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Hybrid search with cloud ssa and proxy servers
We have configured a new cloud ssa in our SharePoint 2013 farm and have successfully crawled on-prem content. We are able to search for on-prem content in SPO but haven't been able to search in this ...
So did you try changing the proxy in the machine.config file on the query server(s) as in my referenced article? You need a reboot of the query server(s) after you change it btw.
Here is a tool to help you troubleshoot https://gallery.technet.microsoft.com/SRx-Core-SharePoint-Search-d60113e9