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Why is the browser prompting me to install Dynamsoft Service repeatedly?


The browser prompting me to install Dynamsoft Service repeatedly and keep getting the error ‘The Dynamic Web TWAIN module is not installed’ in the console.

There are a few possible causes

  • The Dynamsoft Service is not installed properly.
  • The Dynamsoft Service is installed correctly but not started.
  • The requests sent to the Service are redirected because you are using a proxy server on IE.
  • The service’s listening ports are blocked by another software, like anti-virus software.
  • The service is blocked by plugins you have installed in the browser. (e.g. NoScript)
  • If you are accessing an HTTPS site on a Linux machine.

The respective fixes are listed below

  • Check the path C:\Windows\SysWOW64\Dynamsoft\DynamsoftServicex64_17 or C:\Users\{UserName}\AppData\Roaming\Dynamsoft\DynamsoftService and make sure you have the correct files.
  • Check Local Services and make sure Dynamsoft Service is listed and Running.
  • On IE, go to Internet Options –> Security tab, select Local Intranet, then click Sites, uncheck ‘Include all sites that bypass the proxy server’

    why-is-the-browser-prompting-me-to-install-dynamsoft-service-repeatedly-1 why-is-the-browser-prompting-me-to-install-dynamsoft-service-repeatedly-2

  • Check your anti-virus software or any other software that can block local ports and make sure the ports 18622, 18623, 18625 and 18626 are not blocked.
  • Disable all the plugins in the browser, refresh and try again.
  • On your Linux client machine, visit and separately in Chrome and FireFox, manually add both certificates to the exception lists.

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