If you’ve recently launched a Remote Desktop (RDP) session and been greeted with an “Unknown remote connection” warning, you’re not alone. This is the result of a recent Windows security update, and while it might look concerning at first glance, it’s actually Microsoft tightening security rather than indicating a problem.
What’s Changed?
Microsoft has introduced additional security prompts for Remote Desktop connections, particularly when the RDP file isn’t digitally signed, the publisher can’t be verified, or you’re connecting via a gateway. Windows is simply asking you to confirm that you trust the connection before proceeding.
What Does “Unknown publisher” Mean?
This message does not mean the connection is unsafe. It simply means that the RDP file you’re using hasn’t been digitally signed to verify its source. This is common and doesn’t indicate any issue with your system or the remote service.
What Should You Do?
Before clicking Connect, select the following options:
✅ Drives
✅ Clipboard
✅ Printers (if applicable)
This ensures you can copy and paste between your computer and the remote session, and access local files when needed.
Once selected, click Connect.
At present, you may need to follow the above process each time. For ease, we can provide you with new versions of your RDPs which are signed and come with the option to remember chosen settings.
To obtain an updated RDP contact support@rushcliff.com and confirm which user number(s) you require.