SharePoint 2013 Error UserAgent not available file operations may not be optimized

This SharePoint tutorial, we will discuss how to fix the error, UserAgent not available, file operations may not be optimized in SharePoint 2013.

While working in a SharePoint 2013 migration project, we saw some errors in the uls viewer.

The error coming as like below:

11/17/2015 22:48:09.50 w3wp.exe (0x2F50) 0x2ED4 SharePoint Foundation Files ak8dj High UserAgent not available, file operations may not be optimized. at Microsoft.SharePoint.SPFileStreamManager.CreateCobaltStreamContainer(SPFileStreamStore spfs, ILockBytes ilb, Boolean copyOnFirstWrite, Boolean disposeIlb) at Microsoft.SharePoint.SPFileStreamManager.SetInputLockBytes(SPFileInfo& fileInfo, SqlSession session, PrefetchResult prefetchResult) at Microsoft.SharePoint.CoordinatedStreamBuffer.SPCoordinatedStreamBufferFactory.CreateFromDocumentRowset(Guid databaseId, SqlSession session, SPFileStreamManager spfstm, Object[] metadataRow, SPRowset contentRowset, SPDocumentBindRequest& dbreq, SPDocumentBindResults& dbres) at Microsoft.SharePoint.SPSqlClient.GetDocumentContentRow(Int32 rowOrd, Object ospFileStmMgr, SPDocumentBindRequest& dbreq, SPDocumentBindResults& dbres… 69b8429d-ee20-a03f-5a1f-a92a228e83e4

UserAgent not available file operations may not be optimized SharePoint 2013

I googled and tried the below solutions and it worked for me. Run the below PowerShell command.

$webApp = Get-SPWebApplication “http://WebAppURL”
[Microsoft.SharePoint.Publishing.PublishingCache]::FlushBlobCache($webApp)

Then I did IIS reset in all the SharePoint servers and this worked for me.

Another solution, you can also try:

You can look at the Default.aspx page or any page which has been set for default, if it has been customized using SharePoint designer. You can reset those pages to site definition back, sometimes this helps to solve the issue.

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This SharePoint tutorial, we learned how to fix error UserAgent not available file operations may not be optimized SharePoint 2013.

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