We currently have a load-balanced website with its files located on a centralised file share (Azure).

We have added the following to the web.config:

<add key="Umbraco.Core.LocalTempStorage" value="EnvironmentTemp" />
<add key="Umbraco.Examine.LuceneDirectoryFactory" value="Examine.LuceneEngine.Directories.TempEnvDirectoryFactory, Examine" />

Everything seems to work fine, for a while, until it doesn't...

Upon visiting the Examine Management tab, we're presented with an error. Checking the logs and I can see the following:

System.IO.FileNotFoundException: _2i.fnm ---> System.IO.FileNotFoundException: Could not find file '\\xxxxxx\App_Data\TEMP\ExamineIndexes\External\_2i.fnm'. File name: '\\xxxxxx\App_Data\TEMP\ExamineIndexes\External\_2i.fnm'

The site is then in an unresponsive state and requires a restart, as well as clearing the Temp and Cache files. Although that doesn't always fix the corrupt Examine Index issue we seem to be having.

I've read and read Q&A's on the forums but it's all very confusing, so I was hoping someone would be able to point out our error.

Thanks in advance.