Hi Guys I experiencing this problem with my site, running umbraco 4.0.3 on database mySql.

My problem is that a spesific node in content node cannot be expanded, its serve as a root of my web. When i check the log table I found this entry:

At /umbraco/tree.aspx?rnd=58d574f3-5c51-4b1d-aef9-df2622329971&id=1160&treeType=content&contextMenu=true&isDialog=false (Referred by: http://localhost/umbraco/TreeInit.aspx): umbraco.DataLayer.SqlHelperException: Umbraco Exception (DataLayer): SQL helper exception in ExecuteReader ---> MySql.Data.MySqlClient.MySqlException: Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.

   at MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior behavior)

   at MySql.Data.MySqlClient.MySqlHelper.ExecuteReader(MySqlConnection connection, MySqlTransaction transaction, String commandText, MySqlParameter[] commandParameters, Boolean ExternalConn)

   at MySql.Data.MySqlClient.MySqlHelper.ExecuteReader(String connectionString, String commandText, MySqlParameter[] commandParameters)

   at umbraco.DataLayer.SqlHelpers.MySql.MySqlHelper.ExecuteReader(String commandText, MySqlParameter[] parameters) in d:\TeamCity\buildAgent\work\7380c184e9fcd3ea\umbraco\datalayer\SqlHelpers\MySql\MySqlHelper.cs:line 81

   at umbraco.DataLayer.SqlHelper`1.ExecuteReader(String commandText, IParameter[] parameters) in d:\TeamCity\buildAgent\work\7380c184e9fcd3ea\umbraco\datalayer\SqlHelper.cs:line 240

   --- End of inner exception stack trace ---

   at umbraco.DataLayer.SqlHelper`1.ExecuteReader(String commandText, IParameter[] parameters) in d:\TeamCity\buildAgent\work\7380c184e9fcd3ea\umbraco\datalayer\SqlHelper.cs:line 244

   at umbraco.cms.businesslogic.web.Document.GetChildrenForTree(Int32 NodeId)

   at umbraco.cms.presentation.Trees.BaseContentTree.Render(XmlTree& Tree)

   at umbraco.loadContent.Render(XmlTree& Tree)

   at umbraco.cms.presentation.tree.LoadTree(String treeAlias)

   at umbraco.cms.presentation.tree.Page_Load(Object sender, EventArgs e)

   at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)

   at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)

   at System.Web.UI.Control.OnLoad(EventArgs e)

   at umbraco.BasePages.BasePage.OnLoad(EventArgs e)

   at System.Web.UI.Control.LoadRecursive()

   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

I have tried to check my permissions, but its still intact. I have also tried to reindex my website, and its give me the following error in the log table:

Error indexing node: System.NullReferenceException: Object reference not set to an instance of an object.

   at umbraco.cms.businesslogic.index.Indexer.IndexNode(Guid ObjectType, Int32 Id, String Text, String UserName, DateTime CreateDate, Hashtable Fields, Boolean Optimize)

   at umbraco.cms.businesslogic.web.Document.Index(Boolean Optimze)

FYI, my website has been running for at least 3 month now, recently I got this problem and still cannot solve it

Do Anyone know something about this?