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If we have any session variables used in any custom Webparts or any custom pages in Sharepoint and these session variables are used to fetch data based on logged on user, then when we click on "sign in as different user" it does not clear out all the previous session values and cookies. This would not fetch us correct data in a custom Webpart.
When we use custom authentication with ISAPI filters sitting on MOSS, sign in as different user throws an error 401 Unauthorized.
Sign In as different user functionality available in the Welcome.ascx file does not clear out all the session and cookied values.
Make a copy of Init.js available under <Install drive>:Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\LAYOUTS\1033 and save it as Init_Original.js.
Search for method LoginAsAnother.
In the else part of the function comment out the below lines of code
var ch=url.indexOf("?") >=0 ? "&" : "?"; url+=ch+"Source="+escapeProperly(window.location.href); STSNavigate(url);
Add the below line of code:
Save the file.
Limitations of the above method: If a public update, a hotfix package, or a service pack is installed that contains updates to init.js file then the customization done to this file will be lost.
Modifying the files that are installed by SharePoint is not supported. When you modify these files, you must consider that they may be replaced by future updates and service packs. Additionally, there may be complications when you upgrade to later versions of the product. Keep backup copies of all customized files in case they are overwritten by an update. Product support will provide commercially reasonable support for help with modifications but will be unable to provide product changes or hotfixes that result from modifying the files that are installed by SharePoint.
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