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nanosani's avatar
nanosani
Copper Contributor
Oct 14, 2022

Microsoft RDP problems Windows 11 22H2

I have a problem with one of my networks. After upgrading to Windows 11 22H2, I'm having problems with RDP connections. The clients cannot connect to the machine.   However, there is a workaround ...
configuration
security
__Barrett__'s avatar
__Barrett__
Copper Contributor
Sep 21, 2023

I can confirm disabling UDP can help with RDP connections at this point. There's definitely a bug in Windows affecting RDP over UDP right now. Hopefully they patch it soon.

 

Although, one thing that definitely should be cleared up (nanosani), is it doesn't increase security by disabling UDP for RDP. The initial connection is negotiated with TCP first, then moved to UDP (over DTLS).

 

RichardDuffySMB (Dec 12 2022 03:20 PM) - RDP is (default) port 3389. I'm sure it was a mistake, but wanted to be clear that up 🙂

nanosani (Dec 12 2022 03:31 PM) - What you say is true, "Forging UDP packets is easier than TCP packets". Although, what you don't understand is it uses DTLS for UDP transmission. The mindset that you're just "forging UDP" is ridiculous on is face. Either way, any attack on this requires MITM to capture and deconstruct to even begin it. Meaning if an attacker is even good enough to succeed at doing that, then the destination has much bigger things to worry about.

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