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https://blog.devoworx.net/2016/04/30/the-form-cannot-be-submitted-to-the-web-server-either-because-your-computer-is-offline-or-because-the-host-server-is-currently-unavailable-if-this-problem-persists-contact-your-network-administrator/
The form cannot be submitted to the web server either because your computer is offline or because the host server is currently unavailable. If this problem persists, contact your network administrator in SharePoint