ServicePortal error: "A potentially dangerous Request.Form value was detected from the client"

Problem

A problem has been identified in version 7.3 of ServicePortal that can cause the following error:

    Exception type: HttpRequestValidationException
    Exception message: A potentially dangerous Request.Form value was detected from the client

Solution

Navigate to the Modules sub-folder of the ServicePortal folder (normally C:\Inetpub\wwwroot\ServicePortal\Modules).

Take a backup of the IPCForms.aspx file and then open the file with a text editor such as Notepad.

The first line of the file looks like this:

<%@ page language="C#" autoeventwireup="true" inherits="IPCForms, ServicePortal_deploy" %>

Add the text validaterequest="false" within the tag so that the line looks like this:

<%@ page language="C#" autoeventwireup="true" inherits="IPCForms, ServicePortal_deploy" validaterequest="false" %>

Save the file and perform an IIS reset.

This issue should only effect verion 7.3 and is due to be resolved in the next release.