So far only seen that when hosting DNN4x (a .NET20 based app) in a .NET40 environment:
`Configuration Error
D
escription: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.
…
Parser Error Message: The browser or gateway element with ID 'Safari1Plus' cannot be found.
…
Source Error:
…
Line 33: <!– http://www.sunrisebrowser.com/en/–
>
L
ine 34: <!– Mozilla/5.0 (Macintosh; U; PPC Mac OS X; fr-fr) AppleWebKit/125.5.7 (KHTML, like Gecko) SunriseBrowser/0.895 –
>
L
ine 35: <gateway id=“AppleWebKitCatchall” parentID=“Safari1Plus”
>
.
..
Source File: D:\WEBSITES\DNN.SS\App_Browsers\OceanAppleWebKit.browser Line: 35
…`
Change the AppPool to .NET20