Can't connect to Linux VM with RDP

Question

Can't connect to Linux VM with RDP

koen1711 1

I've tried everything for the past 2 hours but I can't connect to my Linux VM, this morning I could but all of the sudden not.
These are my rules: https://gyazo.com/8d718191b4570335683b666d6e81ccef

Lex Li (Microsoft) 6,037 Reputation points Microsoft Employee

2022-10-19T05:59:14.833+00:00

What is the Linux distribution you used? Every distribution now ships with a firewall of itself, so you also need to open RDP port there. Your screen shot only shows that you opened the port on Azure side (which bridges external traffic to the VM), not on the VM itself.
srbhatta-MSFT 8,586 Reputation points Microsoft Employee

2022-10-21T04:38:04.067+00:00

Hi @koen1711 ,
Could you please provide the below requested information.
Thanks.

3 answers

Your answer

Lex Li (Microsoft) 6,037 Reputation points Microsoft Employee

2022-10-19T05:59:14.833+00:00

What is the Linux distribution you used? Every distribution now ships with a firewall of itself, so you also need to open RDP port there. Your screen shot only shows that you opened the port on Azure side (which bridges external traffic to the VM), not on the VM itself.
srbhatta-MSFT 8,586 Reputation points Microsoft Employee

2022-10-21T04:38:04.067+00:00

Hi @koen1711 ,
Could you please provide the below requested information.
Thanks.

Answer 1

Manu Philip 20,206 MVP Volunteer Moderator

It's usually Linux VM can't be connect by RDP over port 3389. Are you saying about SSH over port 22?

Lex Li (Microsoft) 6,037 Reputation points Microsoft Employee

2022-10-19T06:00:17.233+00:00

This guy has xrdp installed, so surely RDP connections can be supported.

Answer 2

koen1711 1

I've added another port and tried it over that, only SSH connection works, my other custom ones don't.

Manu Philip 20,206 Reputation points MVP Volunteer Moderator

2022-10-16T19:13:37.463+00:00

It is expected. Linux VMs are connecting to SSH only and not to RDP
koen1711 1 Reputation point

2022-10-16T19:37:16.6+00:00

Before I could connect through RDP.
Lex Li (Microsoft) 6,037 Reputation points Microsoft Employee

2022-10-19T06:01:06.8+00:00

If you read about xrdp, you will see RDP is a feasible option out there even for Linux/macOS.

Answer 3

Rafael da Rocha 5,251

Hello @koen1711
if it was working before, make sure whatever service was providing the functionality is still active on the VM.
Using your preferred method, check for processes listening on the ports you want to connect, and if IPTables or equivalent is in use, the rules are still allowing the connection.

koen1711 1

The programs are still listening, but I still can't connect:

systemd-r  730 systemd-resolve   13u  IPv4  24738      0t0  TCP 127.0.0.53:53 (LISTEN)  
xrdp-sesm  770            root    7u  IPv6  23214      0t0  TCP [::1]:3350 (LISTEN)  
xrdp       792            xrdp   11u  IPv6  30168      0t0  TCP *:3389 (LISTEN)  
sshd       902            root    3u  IPv4  29064      0t0  TCP *:22 (LISTEN)  
sshd       902            root    4u  IPv6  29066      0t0  TCP *:22 (LISTEN)  
cupsd     2074            root    6u  IPv6  61864      0t0  TCP [::1]:631 (LISTEN)  
cupsd     2074            root    7u  IPv4  61865      0t0  TCP 127.0.0.1:631 (LISTEN)

Rafael da Rocha 5,251 Reputation points

2022-10-19T10:25:28.687+00:00

It seems xrdp is listening on 3389 only for IPv6 connections while sshd is also accepting IPv4.
Is this intended? Are you connecting using IPv6?

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Can't connect to Linux VM with RDP

3 answers

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