Fixing the “For security reasons DTD is prohibited in this XML document.” issue

"For security reasons DTD is prohibited in this XML document. To enable DTD processing set the ProhibitDtd property on XmlReaderSettings to false and pass the settings into XmlReader.Create method."

This post describes a couple of ways to fix the issue “For security reasons DTD is prohibited in this XML document”. At least for me, it appeared when trying to access SharePoint Online using Powershell or a console program using OfficeDev.PnP (which in turn uses CSOM).


When running any piece of code, whether in PowerShell, .exe console or anything else than in the code behind relies on .NET Framework, you get an error like this:

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Unorthodox configuration: How to use VLK and Click-to-run Office Apps side-by-side (Visio and Office 2016 as an example)

Ever had issues with different versions of Office programs not living in harmony together? Me too! This post describes how I was able to fix the issue and get Visio and Office 2016 of different installation types to play well together.


This blog post was inspired by my need to have Office 365 ProPlus (2016 versions) and Visio running side-by-side on my laptop. That turned out to be a lot more complicated than it arguably should be, so I documented the steps for further use. These instructions are written for that particular scenario (installing MS Visio on a machine with pre-existing Office 2016/365 ProPlus installation). My laptop is running Windows 10 Enterprise, which probably caused one of the issues I ran into.

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