Hi all, after successfully upgrading to 2.9.1.0 (though I have temporarily switched to Framework skin as ours needed work), I find the site index rebuild appears not to be working.

When visit /SearchResults.aspx and hit the button to rebuild the index, first I get an error saying 

Hmmm… can't reach this page

It looks like the webpage at https://[mysite.com]/SearchResults.aspx might be having issues, or it may have moved permanently to a new web address.

ERR_HTTP2_PROTOCOL_ERROR

The site is actually still working, and if I browse to the System Log I see this:

2025-06-23 21:14:48,818 INFO (null) - (null) - (null) - mojoPortal.SearchIndex.IndexHelper - Rebuilding Search index. 
2025-06-23 21:14:48,833 INFO (null) - (null) - (null) - mojoPortal.SearchIndex.HtmlContentIndexBuilderProvider - Html Content indexing page - Home 
2025-06-23 21:14:48,896 INFO (null) - (null) - (null) - mojoPortal.Features.SharedFilesIndexBuilderProvider - Shared Files indexing page - Home 
2025-06-23 21:14:48,911 INFO (null) - (null) - (null) - mojoPortal.Features.CalendarEventIndexBuilderProvider - Event Calendar indexing page - Home 
2025-06-23 21:15:07,579 INFO (null) - (null) - (null) - mojoPortal.Web.Global - ------Application Started------ 

And this folder is now empty on the web server: \Data\Sites\1\index

Any ideas how I can fix this? The site search is quite important on this site.

Thanks!