Hi guys,

One of our websites went down recently. The website is hosted on Azure and it got two slots. We made some changes on one of the slot and couriered to production on last week, website was working fine after courier. However we noticed the website and two slots were down on Monday morning (not sure when it started), we re-published the page we changed last week and websites were back. As we could login to cms, so server was running, just frontend was down.

In the log we could only see this error:

[P1868/D3/T95] ERROR Umbraco.Core.UmbracoApplicationBase - An unhandled exception occurred System.Exception: Exception while creating a value. ---> System.IO.IOException: An unexpected network error occurred.

at System.IO._Error.WinIOError(Int32 errorCode, String maybeFullPath) at System.IO.FileStream.ReadCore(Byte[] buffer, Int32 offset, Int32 count) at System.IO.FileStream.Read(Byte[] array, Int32 offset, Int32 count) at System.IO.BinaryReader.Read(Byte[] buffer, Int32 index, Int32 count) at Lucene.Net.Store.SimpleFSDirectory.SimpleFSIndexInput.ReadInternal(Byte[] b, Int32 offset, Int32 len) at Lucene.Net.Store.BufferedIndexInput.ReadBytes(Byte[] b, Int32 offset, Int32 len, Boolean useBuffer) at Lucene.Net.Index.CompoundFileReader.CSIndexInput.ReadInternal(Byte[] b, Int32 offset, Int32 len) at Lucene.Net.Store.BufferedIndexInput.Refill() at Lucene.Net.Store.BufferedIndexInput.ReadByte() at Lucene.Net.Store.IndexInput.ReadVInt() at Lucene.Net.Index.TermBuffer.Read(IndexInput input, FieldInfos fieldInfos) at Lucene.Net.Index.SegmentTermEnum.Next() at Lucene.Net.Index.SegmentTermEnum.ScanTo(Term term) at Lucene.Net.Index.TermInfosReader.Get(Term term, Boolean useCache) at Lucene.Net.Index.TermInfosReader.Terms(Term term) at Lucene.Net.Index.SegmentReader.Terms(Term t) at Lucene.Net.Index.DirectoryReader.MultiTermEnum..ctor(IndexReader topReader, IndexReader[] readers, Int32[] starts, Term t) at Lucene.Net.Index.DirectoryReader.Terms(Term term) at Lucene.Net.Search.WildcardTermEnum..ctor(IndexReader reader, Term term) at Lucene.Net.Search.WildcardQuery.GetEnum(IndexReader reader) at Lucene.Net.Search.MultiTermQuery.ConstantScoreAutoRewrite.Rewrite(IndexReader reader, MultiTermQuery query) at Lucene.Net.Search.WildcardQuery.Rewrite(IndexReader reader) at Lucene.Net.Search.BooleanQuery.Rewrite(IndexReader reader) at Lucene.Net.Search.BooleanQuery.Rewrite(IndexReader reader) at Lucene.Net.Search.IndexSearcher.Rewrite(Query original) at Lucene.Net.Search.Query.Weight(Searcher searcher) at Lucene.Net.Search.Searcher.CreateWeight(Query query) at Lucene.Net.Search.Searcher.Search(Query query, Collector results) at Examine.LuceneEngine.SearchResults.DoSearch(Query query, IEnumerable1 sortField, Int32 maxResults) in C:\projects\examine-qvx04\src\Examine\LuceneEngine\SearchResults.cs:line 110 at Examine.LuceneEngine.Providers.BaseLuceneSearcher.Search(ISearchCriteria searchParams, Int32 maxResults) in C:\projects\examine-qvx04\src\Examine\LuceneEngine\Providers\BaseLuceneSearcher.cs:line 182 at Examine.LuceneEngine.Providers.BaseLuceneSearcher.Search(ISearchCriteria searchParams) in C:\projects\examine-qvx04\src\Examine\LuceneEngine\Providers\BaseLuceneSearcher.cs:line 163 at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.GetUmbracoMediaCacheValues(Int32 id) at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.<>c__DisplayClass38_0.<GetCacheValues>b__0() at Umbraco.Core.Cache.DictionaryCacheProviderBase.<>c__DisplayClass10_0.<GetSafeLazy>b__0() --- End of inner exception stack trace --- at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem(String cacheKey, Func1 getCacheItem, Nullable1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, CacheDependency dependency) at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem(String cacheKey, Func1 getCacheItem, Nullable1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, String[] dependentFiles) at Umbraco.Core.Cache.DeepCloneRuntimeCacheProvider.GetCacheItem(String cacheKey, Func1 getCacheItem, Nullable1 timeout, Boolean isSliding, CacheItemPriority priority, CacheItemRemovedCallback removedCallback, String[] dependentFiles) at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.GetCacheValues(Int32 id, Func2 func) at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.GetUmbracoMedia(Int32 id) at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedMediaCache.GetById(UmbracoContext umbracoContext, Boolean preview, Int32 nodeId) at Umbraco.Web.PublishedCache.ContextualPublishedCache1.GetById(Boolean preview, Int32 contentId) at Umbraco.Web.UmbracoHelper.TypedMedia(Guid id) at Umbraco.Web.PropertyEditors.ValueConverters.MediaPickerPropertyConverter.ConvertSourceToObject(PublishedPropertyType propertyType, Object source, Boolean preview) at Umbraco.Web.Models.DetachedPublishedProperty.<.ctor>b__7_1() at System.Lazy1.CreateValue() at System.Lazy1.LazyInitValue() at System.Lazy1.getValue() at Umbraco.Web.Models.DetachedPublishedProperty.getValue() at Umbraco.Web.PublishedPropertyExtension.GetValue[T](IPublishedProperty property, Boolean withDefaultValue, T defaultValue) at Umbraco.Web.PublishedContentModels.UsnAcBanner.getBannerImage() at ASP.PageViewsPartialsUSNAdvancedPageComponentsUSNACBannercshtml.Execute() in d:\home\site\wwwroot\Views\Partials\USNAdvancedPageComponents\USNACBanner.cshtml:line 85 at System.Web.WebPages.WebPageBase.ExecutePageHierarchy() at System.Web.Mvc.WebViewPage.ExecutePageHierarchy() at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) at Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer) at System.Web.Mvc.HtmlHelper.RenderPartialInternal(String partialViewName, ViewDataDictionary viewData, Object model, TextWriter writer, ViewEngineCollection viewEngineCollection) at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model) at ASP.PageViewsPartialsUSNAdvancedPageComponentsUSNComponentsSwitchcshtml.Execute() in d:\home\site\wwwroot\Views\Partials\USNAdvancedPageComponents\USNComponentsSwitch.cshtml:line 23 at System.Web.WebPages.WebPageBase.ExecutePageHierarchy() at System.Web.Mvc.WebViewPage.ExecutePageHierarchy() at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) at Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer) at System.Web.Mvc.HtmlHelper.RenderPartialInternal(String partialViewName, ViewDataDictionary viewData, Object model, TextWriter writer, ViewEngineCollection viewEngineCollection) at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) at ASP.PageViewsPartialsUSNAdvancedPageComponentsUSNAdvancedPageComponentscshtml.Execute() in d:\home\site\wwwroot\Views\Partials\USNAdvancedPageComponents\USNAdvancedPageComponents.cshtml:line 27 at System.Web.WebPages.WebPageBase.ExecutePageHierarchy() at System.Web.Mvc.WebViewPage.ExecutePageHierarchy() at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) at Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer) at System.Web.Mvc.HtmlHelper.RenderPartialInternal(String partialViewName, ViewDataDictionary viewData, Object model, TextWriter writer, ViewEngineCollection viewEngineCollection) at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model) at ASP.PageViewsUSNAdvancedPagecshtml.Execute() in d:\home\site\wwwroot\Views\USNAdvancedPage.cshtml:line 6 at System.Web.WebPages.WebPageBase.ExecutePageHierarchy() at System.Web.Mvc.WebViewPage.ExecutePageHierarchy() at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) at System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) at System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) at Umbraco.Core.Profiling.ProfilingView.Render(ViewContext viewContext, TextWriter writer) at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList1 filters, ActionResult actionResult) at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() at System.Web.Mvc.Async.AsyncControllerActionInvoker.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult1.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase1.End() at System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) at System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase1.End() at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) at System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase1.End() at System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) at System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResultBase`1.End() at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

We couldn’t address the problem, would you be able to help? The umbraco version we are using is 7.12.3.

Thanks