Avoiding Issues with IIS Request Filtering or URL Scan

If you have activated Request Filtering or URLScan software, you will need to allow the following verbs:

• GET
• HEAD
• POST

Note that the Horizons deployment process will clear existing IIS request filtering rules and define the necessary file extension and verb rules for each sub-application during deployment. If modification of request filtering rules has been disallowed on the IIS root level, you will see errors like this when accessing affected applications:

Figure 1 - Example of an error due to filtering rules being locked

To avoid this, make sure that you remove any lockitem=”true” flags set in the applicationHost.config file for IIS. Example below:

<verbs allowUnlisted="true" applyToWebDAV="true">
<add verb="TRACE" allowed="false" lockItem="true" />
</verbs>