There are times when configuring or managing cloud hybrid search doesn't go as expected. Most issues can be easily fixed. The following common troubleshooting scenarios can be used to help address these issues.
The cloud hybrid search setup fails to complete due to networking
Cloud hybrid search requires access to SharePoint Online. If your environment is behind a proxy server or another network-filtering appliance, you should try to bypass the proxy server or appliances to reach SharePoint Online. If bypassing the proxy is not possible, you may need to configure the WinHTTP proxy settings via netsh.
You can use netsh to import Internet Explorer's proxy configuration into a WinHTTP proxy configuration:
netsh winhttp import proxy source=ie
For more information on the uses and capabilities of netsh, see https://docs.microsoft.com/en-us/windows-server/networking/technologies/netsh/netsh-contexts.
Once you've updated the proxy settings...