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I have a problem when upgrading my website to the latest version : 7.2.2.

While everything works fine during the process, I cannot access any of my pages after upgrade the and I'm getting back 404 errors.

The only page I can access is the home page by adding /Default.aspx after my website URL.

If I replace the advanced UrlFormat by the old humanFriendly method, in the web.config file, everyhing is back to normal.

I'm looking for quite a while now, and I found the "origin" of the problem thanks to the Dnn Software forum, but nobody has given me a solution.
Now I do want to use again the advanced format to get rid of those aspx extension, as in my current website version (7.1.2).

Any hint or test I could run will be helpful...I'm getting kind of desperate.

PS : I read something about portal alias and language, but I have only activated one single language (French) and I don't use content localization.

Hi Aderson,

Thank you for the quick answer, as always.

I already tried the first technique and I manage to have errors logged on the event viewer when turning on the advanced mode.

I can then easily retrieve those error by turning back to the human friendly mode.

Here is what I got...do you think any further step would be more helpful (fiddler, symbol files ??)

Url Processing Exception:Exception in Url Rewriting Process

Http Status:500 Internal Server Error

Original Path:http://www.pcs.fr/Admin/Site-Settings

Raw Url:/Admin/Site-Settings

Final Url:null

Rewrite Result:[no rewrite]

Redirect Location:[no redirect]

Action:Continue

Reason:Exception

Portal Id:0

Tab Id:-1

Http Alias:www.pcs.fr

Debug Message 1:Exception: Object reference not set to an instance of an object.

Debug Message 2:(TRUNCATED TO 500 CHARS): Stack Trace: at DotNetNuke.Security.PortalSecurity.IsInRoles(UserInfo objUserInfo, PortalSettings settings, String roles) at DotNetNuke.Security.Permissions.PermissionProvider.HasPagePermission(TabInfo tab, String permissionKey) at DotNetNuke.Common.Globals.ValidateModuleInTab(Int32 tabId, String moduleName) at DotNetNuke.Entities.Urls.TabIndexController.AddStandardPagesToDict(SharedDictionary`2 tabIndex, Dictionary`2 dupCheck, String httpAlias, Int32 portalId, String cultureCode)

Debug Message 3:Inner Ex : null

Exception Type:System.NullReferenceException

Message:

Object reference not set to an instance of an object.

Stack Trace:(TRUNCATED TO 500 CHARS): at DotNetNuke.Security.PortalSecurity.IsInRoles(UserInfo objUserInfo, PortalSettings settings, String roles) at DotNetNuke.Security.Permissions.PermissionProvider.HasPagePermission(TabInfo tab, String permissionKey) at DotNetNuke.Common.Globals.ValidateModuleInTab(Int32 tabId, String moduleName) at DotNetNuke.Entities.Urls.TabIndexController.AddStandardPagesToDict(SharedDictionary`2 tabIndex, Dictionary`2 dupCheck, String httpAlias, Int32 portalId, String cultureCode) at DotNe