Site crashing - possibly Lucene/Examine issue?

Umbraco 13 site has been running along fine for months and then this morning it’s down, won’t come back up. Errors seem to be all along the lines of this - any advice as to what we could try? Have tried usual app pool restarts, site restarts, cleared out temp folder etc. Can’t get into the back end either. Thanks!

{"@t":"2025-05-07T07:54:00.8538757Z","@mt":"{StartMessage} [Timing {TimingId}]","StartMessage":"Examine shutting down","TimingId":"34dfa93","SourceContext":"Umbraco.Cms.Core.Logging.ProfilingLogger","ProcessId":6572,"ProcessName":"w3wp","ThreadId":20,"ApplicationId":"980723de35b2a434698704ac817cea2393191c0f","MachineName":"RADE-XH23","Log4NetLevel":"INFO "}
{"@t":"2025-05-07T07:54:02.0293397Z","@mt":"Connection ID \"{ConnectionId}\", Request ID \"{TraceIdentifier}\": An unhandled exception was thrown by the application.","@l":"Error","@x":"System.ObjectDisposedException: this ReferenceManager is disposed.\r\nObject name: 'Lucene.Net.Search.SearcherManager'.\r\n   at Lucene.Net.Search.ReferenceManager`1.Acquire()\r\n   at Lucene.Net.Search.SearcherManager.IsSearcherCurrent()\r\n   at Examine.Lucene.Providers.LuceneSearcher.GetSearchContext()\r\n   at Examine.Lucene.Providers.BaseLuceneSearcher.CreateQuery(String category, BooleanOperation defaultOperation, Analyzer luceneAnalyzer, LuceneSearchOptions searchOptions)\r\n   at Examine.Lucene.Providers.BaseLuceneSearcher.CreateQuery(String category, BooleanOperation defaultOperation)\r\n   at AspNetCore.Views_Partials_website_MiscPageElements_SearchResults.ExecuteAsync()\r\n   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)\r\n   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, Boolean invokeViewStarts)\r\n   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)\r\n   at Microsoft.AspNetCore.Mvc.ViewFeatures.HtmlHelper.RenderPartialCoreAsync(String partialViewName, Object model, ViewDataDictionary viewData, TextWriter writer)\r\n   at Microsoft.AspNetCore.Mvc.ViewFeatures.HtmlHelper.PartialAsync(String partialViewName, Object model, ViewDataDictionary viewData)\r\n   at AspNetCore.Views_USNSearchResultsPage.ExecuteAsync() in D:\\inetpub\\WebsiteName\\www-u13\\Views\\USNSearchResultsPage.cshtml:line 42\r\n   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)\r\n   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, Boolean invokeViewStarts)\r\n   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)\r\n   at

What a waste of a day.

What I also noticed, while trying to get it to work was that a site on a test domain would work perfectly but once we switched the live domain over to it it broke again

Anyway it turned out the permissions were not set correctly on the site, and had not been since the start. I’m not sure how it was even working at all, but once we sorted them everything started working again. Or maybe it had just had a nice rest!

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