Hi all,

don't see a forum for debugging discussions, so am trying here in Install.

I have several DNN sites running on IIS 6.0, Windows Server2003.

4 on a single instance of DNN 4.5.5

1 each on a new IIS instance using DNN 4.9.2

one of the new ones just quit suddenly:  www.thewordislife.net

gives:

http://www.thewordislife.net/Default.aspx?tabid=37&error=Object+reference+not+set+to+an+instance+of+an+object.&content=0

DotNetNuke Error: - Version 04.09.02

An error has occurred.
An error has occurred.

not very helpful

IIS 6.0 logs
2009-12-11 13:36:36 W3SVC251805 172.21.1.100 GET /Default.aspx tabid=37&error=Object+reference+not+set+to+an+instance+of+an+object.&content=0 80 - 99.66.252.137 Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+6.0;+WOW64;+Trident/4.0;+GTB6.3;+SLCC1;+.NET+CLR+2.0.50727;+Media+Center+PC+5.0;+InfoPath.2;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729) 200 0 0
2009-12-11 13:36:36 W3SVC251805 172.21.1.100 GET /Default.aspx - 80 - 99.66.252.137 Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+6.0;+WOW64;+Trident/4.0;+GTB6.3;+SLCC1;+.NET+CLR+2.0.50727;+Media+Center+PC+5.0;+InfoPath.2;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729) 302 0 0
2009-12-11 13:36:57 W3SVC251805 172.21.1.100 GET /Default.aspx - 80 - 99.66.252.137 Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+6.0;+WOW64;+Trident/4.0;+GTB6.3;+SLCC1;+.NET+CLR+2.0.50727;+Media+Center+PC+5.0;+InfoPath.2;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729) 302 0 0
2009-12-11 13:37:17 W3SVC251805 172.21.1.100 GET /Home/tabid/37/ctl/Privacy/language/en-US/Default.aspx - 80 - 99.66.252.137 Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+6.0;+WOW64;+Trident/4.0;+GTB6.3;+SLCC1;+.NET+CLR+2.0.50727;+Media+Center+PC+5.0;+InfoPath.2;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729) 302 0 0
2009-12-11 13:37:17 W3SVC251805 172.21.1.100 GET /Default.aspx tabid=37&error=Object+reference+not+set+to+an+instance+of+an+object. 80 - 99.66.252.137 Mozilla/4.0+(compatible;+MSIE+8.0;+Windows+NT+6.0;+WOW64;+Trident/4.0;+GTB6.3;+SLCC1;+.NET+CLR+2.0.50727;+Media+Center+PC+5.0;+InfoPath.2;+.NET+CLR+3.5.30729;+.NET+CLR+3.0.30729) 200 0 0
2009-12-11 13:38:55 W3SVC251805 172.21.1.100 GET /Prayer/tabid/63/Default.aspx code=ksp 80 - 220.181.7.132 Baiduspider+(+http://www.baidu.com/search/spider.htm) 302 0 64
2009-12-11 13:38:55 W3SVC251805 172.21.1.100 GET /Default.aspx tabid=63&error=Object+reference+not+set+to+an+instance+of+an+object.&content=0 80 - 220.181.7.127 Baiduspider+(+http://www.baidu.com/search/spider.htm) 200 0 0
2009-12-11 13:40:03 W3SVC251805 172.21.1.100 GET /Default.aspx - 80 - 76.248.238.176 Mozilla/5.0+(Windows;+U;+Windows+NT+6.0;+en-US;+rv:1.9.1.3)+Gecko/20090824+Firefox/3.5.3+(.NET+CLR+3.5.30729) 302 0 0
2009-12-11 13:40:03 W3SVC251805 172.21.1.100 GET /Default.aspx tabid=37&error=Object+reference+not+set+to+an+instance+of+an+object.&content=0 80 - 76.248.238.176 Mozilla/5.0+(Windows;+U;+Windows+NT+6.0;+en-US;+rv:1.9.1.3)+Gecko/20090824+Firefox/3.5.3+(.NET+CLR+3.5.30729) 200 0 0

is there any good resource on how to approach debugging DNN? I can find nothing useful on this site or on the web in my searches so far.

we tried changing the web.config file to give better messages but just keep getting the same message. Have restarted this IIS instance several times.

thanks for any ideas.

ok, checked the event log and error logs in the dnn db and IIS, lots of entries but all seem to be of the symptom, no clue as to the cause. I am still trying to find a good writeup on a debug process for DNN. What to look for / in, how to get better error messages turned on, some strategies, etc. Have not found anything.

we finally reloaded from a backup and things came up again, no clue as to the cause yet. And the server / dnn is painfully slow.

One possible problem I have found in MS .net KB is about xml, .net and threads, where too many xml threads lock up the web server. my symptoms are similar to that. Will be posting in the xml module forum on this issue.