--- layout: default-layout noTitleIndex: true needAutoGenerateSidebar: true title: Dynamic Web TWAIN SDK – Content-Security-Policy violated keywords: Dynamic Web TWAIN, Content-Security-Policy breadcrumbText: Dynamic Web TWAIN – Content-Security-Policy violated description: Dynamic Web TWAIN – Content-Security-Policy violated date: 2022-02-18 10:38:17 +0000 last_modified: 2022-11-01 04:15:58 +0000 --- View all FAQs about [Project Deployment and End-user Installation]( https://www.dynamsoft.com/web-twain/docs/faq/#project-deployment-and-end-user-installation) # Dynamic Web TWAIN – Content-Security-Policy violated If your server has Content-Security-Policy enabled, you might get an error when accessing a web scanning page using Dynamic Web TWAIN. ``` CSP14312: Resource violated directive 'default-src 'self' 'unsafe-inline' 'unsafe-eval'' in Content-Security-Policy: wss://127.0.0.1:8992/. Resource will be blocked. ``` In such cases, you will need to modify your Content-Security-Policy settings to allow the loading of Dynamic Web TWAIN JS files like dynamsoft.webtwain.initiate.js, dynamsoft.webtwain.config.js. etc. To do so, please set the Content-Security-Policy value on the client or server side to: ``` connect-src 'self' ws://127.0.0.1:18622 wss://127.0.0.1:18623 ws://127.0.0.1:18625 wss://127.0.0.1:18626 http://127.0.0.1:18622 https://127.0.0.1:18623 http://127.0.0.1:18625 https://127.0.0.1:18626 ``` More information can be found on https://content-security-policy.com/