Why can't connect to my VM?

Question

I cannot connect to the VM. It says Unable to connect. I'm using a mac. I also tried with my windows computer but that didn't work Error Code:0x204

Answer 1

Hi @Aiden Mathew ,

and directly under the lines in your screenshots you see which Security Rules are configured.

You should compare your Security Rules in your NSG with the Security Rules in my NSGs screenshot above (the yellow marked Security Rule is required for RDP)
.
If this Security Rule is missing in your NSG -> Click on Add Inbound Rule
Add a new Security Rule like this:
Source IP: Any
Source Port: Any
Destination IP: Any
Service: RDP
Destination Port: 3389
Protocol: TCP
Action: Allow
Priority: 100 (if 100 is already in use choose any priority like 200, 300 or 400, ...)
Name: RDP Allow

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten

Answer 2

Hi @Aiden Mathew ,

the Windows VM is running in Azure?
If yes -> The VM got a public IP assigned?
If yes -> Are there Network Security Groups (NSG) associated (associated to VM and/or Azure Virtual Network)?
If yes ->Are there Security Inbound Rules defined for RDP Port 3389 allow?

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten

Answer 3

Hi @Aiden Mathew ,

in the Azure Portal the Public IP (used to connect via RDP from outside) you can check here:

If there are NSGs associated with the VM and/or the Virtual Network and the configured Security Rules you can see here:

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(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)

Regards
Andreas Baumgarten

Answer 4

Hello @Aiden Mathew ,

Welcome to the Microsoft Q&A platform. Happy to answer your question.

Error Code 0x204 is a Remote Desktop Connection problem. It mostly occurs when a user tries to connect to a remote device but get failed due to some reasons such as a driver issue and security problems. It comes with an error message like this. Since when did this issue occurred? Did you make any new configurations or updates on the VM?

After checking on the NSG rules as suggested by community member @andreas Baumgarten, please look at the thread explained about the same error 0x204 you might try first:
https://learn.microsoft.com/en-us/answers/questions/187583/rdp-works-pc-to-pc-but-i-get-error-code-0x204-mac.html

Another article talking about this error https://appuals.com/remote-desktop-error-code-0x204/

And this article for general troubleshoot :
How to Fix Remote Desktop Error Code 0x204 on Windows and MacOS?

(If the reply was helpful please don't forget to upvote and/or accept as answer, thank you)