Hello,

Apologies at the start as I'm not a web developer and haven't had much experience administering web servers so a lot of what I say or ask may be very stupid.

Our corporate web site is managed via Umbraco 4 v4.0.2.1, Assembly version 1.0.3441.17657.

When the user who manages the web site content tries to logon to Umbraco on the server she is intermittently getting an error message and can't get on. If we do an iisreset on the server, she is able to log on and work on Umbraco fine.

This used to be occurring about once a month but in recent weeks it has started to occur much more frequently - perhaps once every couple of days.

I've been onto the server and have found the event below in the Application event log occurs at the time the user tries to logon to Umbraco but gets the error.

Log Name: Application
Source: ASP.NET 2.0.50727.0
Date: 29/02/2012 09:25:01
Event ID: 1309
Task Category: Web Event
Level: Warning
Keywords: Classic
User: N/A
Computer: <removed>
Description:
Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 29/02/2012 09:25:01
Event time (UTC): 29/02/2012 09:25:01
Event ID: 19561c23f2e5429faad4257a5e483ad7
Event sequence: 3498
Event occurrence: 10
Event detail code: 0

Application information:
Application domain: <removed>
Trust level: Full
Application Virtual Path: /
Application Path: <removed>
Machine name: <removed>

Process information:
Process ID: 4820
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE

Exception information:
Exception type: NullReferenceException
Exception message: Object reference not set to an instance of an object.

Request information:
Request URL: http://<removed>/umbraco/editContent.aspx?id=1069
Request path: /umbraco/editContent.aspx
User host address: <removed>
User:
Is authenticated: False
Authentication Type:
Thread account name: NT AUTHORITY\NETWORK SERVICE

Thread information:
Thread ID: 6
Thread account name: NT AUTHORITY\NETWORK SERVICE
Is impersonating: False
Stack trace: at umbraco.controls.ContentControl.addControlNew(Property p, TabPage tp, String Caption)
at umbraco.controls.ContentControl..ctor(Content c, publishModes CanPublish, String Id)
at umbraco.cms.presentation.editContent.OnInit(EventArgs e)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)


Custom event details:

Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="ASP.NET 2.0.50727.0" />
<EventID Qualifiers="32768">1309</EventID>
<Level>3</Level>
<Task>3</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2012-02-29T09:25:01.000Z" />
<EventRecordID>12156622</EventRecordID>
<Channel>Application</Channel>
<Computer><removed></Computer>
<Security />
</System>
<EventData>
<Data>3005</Data>
<Data>An unhandled exception has occurred.</Data>
<Data>29/02/2012 09:25:01</Data>
<Data>29/02/2012 09:25:01</Data>
<Data>19561c23f2e5429faad4257a5e483ad7</Data>
<Data>3498</Data>
<Data>10</Data>
<Data>0</Data>
<Data><removed></Data>
<Data>Full</Data>
<Data>/</Data>
<Data><removed></Data>
<Data><removed></Data>
<Data>
</Data>
<Data>4820</Data>
<Data>w3wp.exe</Data>
<Data>NT AUTHORITY\NETWORK SERVICE</Data>
<Data>NullReferenceException</Data>
<Data>Object reference not set to an instance of an object.</Data>
<Data>http://<removed>/umbraco/editContent.aspx?id=1069</Data>;
<Data>/umbraco/editContent.aspx</Data>
<Data><removed></Data>
<Data>
</Data>
<Data>False</Data>
<Data>
</Data>
<Data>NT AUTHORITY\NETWORK SERVICE</Data>
<Data>6</Data>
<Data>NT AUTHORITY\NETWORK SERVICE</Data>
<Data>False</Data>
<Data> at umbraco.controls.ContentControl.addControlNew(Property p, TabPage tp, String Caption)
at umbraco.controls.ContentControl..ctor(Content c, publishModes CanPublish, String Id)
at umbraco.cms.presentation.editContent.OnInit(EventArgs e)
at System.Web.UI.Control.InitRecursive(Control namingContainer)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
</Data>
</EventData>
</Event>

Can anyone suggest what the problem may be and how I could resolve it? I'm afraid I'll need very detailed steps as to how to carry out any resolution.

Thank you in advance for any help,

R