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Issue with browsing files in browser having special characters in file name and fix

After upgrading one of our very old customer’s website from EPiServer 4.62 to CMS 6 R2, it was reported that documents with special characters in file name (for e.g. ‘S&R12.pdf’) throwing ‘System.Web.HttpException: A potentially dangerous Request.Path value was detected from the client (&).’ when they are being opened up in browser.

Fix for this is issue is to just add requestPathInvalidCharacters="" if you want to allow all special characters.

The above attribute must be added to the element <httpRuntime> in your website’s web.config so that it will look as follows:

<configuration>

    .

    .

    <system.web>

        .

        .

        <httpRuntime requestValidationMode="2.0" requestPathInvalidCharacters="" />

        .

        .

    </system.web>

    .

    .

</configuration>

If you want to restrict certain special characters then make sure you specify them as requestPathInvalidCharacters="&lt;,&gt;,*,%,:,&amp;,\"

Nov 22, 2012

( 11/22/2012 8:15:26 AM)

See my blogpost for how to activate validation on filenames in the EPiServer filemanager. I think you don't have this setting since you have upgraded from an EPi 4 site.

http://world.episerver.com/Blogs/Per-Nergard/Dates/2011/6/Hot-to-add-validation-of-folder-names-in-CMS5-filemanager/

Santosh Achanta
( By Santosh Achanta, 1/17/2013 10:15:29 PM)

Hi Per, the settings illegalCharactersRegex and illegalCharactersDisplayString doesn't help me with this problem unless I have the setting I have specified in this blog. Also in EPiServer 7 the settings you mentioned are no more valid.

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