--- title: CMSE Installation Fails During Component Service Check description: Not Accessible Error During CMSE Installation --- [Skip to content](https://commercial.screenbeam.com/en/support/cmse-installation-fails-during-component-service-check#main-content) English Show submenu for translations [![ScreenBeam logo](https://commercial.screenbeam.com/hs-fs/hubfs/ScreenBeamLogo-Zendesk-2.png?width=180&height=22&name=ScreenBeamLogo-Zendesk-2.png)](https://www.screenbeam.com/) Open main navigation Close main navigation - English Show submenu for translations - [Open Ticket](https://helpdesk.screenbeam.com/ticket) [Open Ticket](https://helpdesk.screenbeam.com/ticket?hsLang=en) How can we help? - There are no suggestions because the search field is empty. 1. [Commercial Knowledge Base](https://commercial.screenbeam.com/en/support?hsLang=en) 2. [Known Issues & Troubleshooting Tips](https://commercial.screenbeam.com/en/support/known-issues-troubleshooting-tips?hsLang=en) 3. [CMS Enterprise](https://commercial.screenbeam.com/en/support/known-issues-troubleshooting-tips?hsLang=en#cms-enterprise) # CMSE Installation Fails During Component Service Check ## During the installation of CMSE, users can run into an error screen where they see Error: \[Service\] is not accessible ### ERROR: Users might see an error that looks like the image below.  ![](https://commercial.screenbeam.com/hs-fs/hubfs/image-png-Sep-29-2026-07-58-40-6876-PM.png?width=624&height=442&name=image-png-Sep-29-2026-07-58-40-6876-PM.png) ### CAUSE This is usually caused by a security setting on the server you are trying to install the CMSE software on. Or you have a very locked-down server environment. By default, all extensions are blocked in IIS, and we have to specify which extension the CMSE app uses so that it can configure it through the filtering service. ### FIX ![](https://commercial.screenbeam.com/hs-fs/hubfs/image-png-Oct-06-2026-08-44-31-9629-PM.png?width=670&height=345&name=image-png-Oct-06-2026-08-44-31-9629-PM.png) 1. You can temporarily disable the filtering service to allow all extensions so that they can use CMSE 2. Or you can allow the following extensions   "." .png .jpg .jpeg .img .pem .js .css .html .xhtml .htm .json .xml .svg .ico .woff .woff2 .text .avif .webp .apng 3. Also check the **"Allow unlisted file name extensions"** setting in IIS Request Filtering. Make sure that it is allowed 4. Once all of these have been modified or enabled, the application should work as expected. 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