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Defining the Path to the Error Message
iView 
By default the iView DedicationAlerter of portal component sap.com.portal.supportability.isolde is called. You can display a different iView (e.g. with your own error message text).
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1. Choose System Administration ® Support ® Support-Desk ® Portal Runtime ® Workload Distribution Configuration.
2. Click on folder Workload Distribution Configuration.
3. Go to edit mode for service DistributionConfiguration.
4. In the field Default Alert iView Name enter the desired iView path and click on Apply.

Do not change the properties HTTP Methods and Use Absolute Path.