Unable to connect to SFTP server on Azure VM with public IP

Question

Unable to connect to SFTP server on Azure VM with public IP

Josue Gonzalez 110

We have a SFTP server running on an Azure VM and we cannot connect to it using the Public IP address of the virtual machine. We are able to connect via internal/private IP address.

We implemented outbound and inbound rules to allow connection via port 3388 (Source = Any, Protocol = TCP, Destination = Any) attached to the subnet and the NIC

GitaraniSharma-MSFT 49,911 Reputation points Microsoft Employee Moderator

2023-10-25T08:41:38.77+00:00

Hello @Josue Gonzalez ,

Apologies for the delay in response.

Could you please share a screenshot of the issue along with the error message that you receive when trying to connect to the SFTP server using the Public IP?

Regards,

Gita
Josue Gonzalez 110 Reputation points

2023-10-25T21:08:28.4366667+00:00

Thank you all for your responses. The issue was due to the source port in the NSG rule. This was set as 3388; when we changed it to * the issue was fixed.
GitaraniSharma-MSFT 49,911 Reputation points Microsoft Employee Moderator

2023-10-26T08:25:25.4233333+00:00

Thank you for the update, @Josue Gonzalez . Glad to hear that the issue is now resolved.

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GitaraniSharma-MSFT 49,911 Reputation points Microsoft Employee Moderator

2023-10-25T08:41:38.77+00:00

Hello @Josue Gonzalez ,

Apologies for the delay in response.

Could you please share a screenshot of the issue along with the error message that you receive when trying to connect to the SFTP server using the Public IP?

Regards,

Gita
Josue Gonzalez 110 Reputation points

2023-10-25T21:08:28.4366667+00:00

Thank you all for your responses. The issue was due to the source port in the NSG rule. This was set as 3388; when we changed it to * the issue was fixed.
GitaraniSharma-MSFT 49,911 Reputation points Microsoft Employee Moderator

2023-10-26T08:25:25.4233333+00:00

Thank you for the update, @Josue Gonzalez . Glad to hear that the issue is now resolved.

Answer 1

msrini-MSFT 9,291 Microsoft Employee

Hi,

From Azure Platform perspective, you will need to make sure that inbound NSG rules are allowed on the port which SFTP listens on. Default port for SFTP server is port 22. If you have configured port 3389, then that should be fine.

Once platform NSG are set right, you will need to check the guest OS firewall. If it is windows, then look for Windows Firewall. If its Linux, look for ip tables and check if the SFTP port is allowed.

If none of the above works, then can you run "netstat -ano" and share the screenshot here?

Regards,

Karthik Srinivas

Josue Gonzalez 110 Reputation points

2023-10-18T21:43:11.8266667+00:00

PowerShell_transcript.TSMS0930.+XgUpfRb.20231018162503.txt
msrini-MSFT 9,291 Reputation points Microsoft Employee

2023-10-19T01:24:32.6+00:00

Can you share the working SFTP connection and non-working SFTP connection? I just wanted to understand how you are trying to connect and what error message you are getting.

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Unable to connect to SFTP server on Azure VM with public IP

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