launch debug connection refused when localhost is not 127.0.0.1

[zhongpan]

Environment data

• VS Code version: 1.44.2
• Extension version (available under the Extensions sidebar): 2020.4.74986
• OS and version: centos7
• Python version (& distribution if applicable, e.g. Anaconda): 2.7.5

Expected behaviour

launch debug Current File success

Actual behaviour

launch debug Current File connection refused

Steps to reproduce:

Modify the localhost in /etc/hosts that is not 127.0.0.1, such as eth0 ip.Then launch debug.

My analysis and suggestions

Because localhost in /etc/hosts file is not 127.0.0.1,
Therefore, DebugAdapter is not listening on the address 127.0.0.1,
Therefore, "ptvsd --client --host localhost" cannot connect to DebugAdapter.
It is recommended that the DebugAdapter listen at 0.0.0.0.

[int19h]

It sounds like you're using ptvsd 4.x for the debugger. Can you please try with debugpy? Take a look at microsoft/ptvsd#2104 to see the various possible reasons why it's not enabled for you - most likely it's because of telemetry opt-out.

[zhongpan]

It sounds like you're using ptvsd 4.x for the debugger. Can you please try with debugpy? Take a look at microsoft/ptvsd#2104 to see the various possible reasons why it's not enabled for you - most likely it's because of telemetry opt-out.

Yes, I'm using ptvsd. As you suggested, it works when I switch to debugpy.

[int19h]

Thank you for the confirmation! We're going with debugpy exclusively going forward, so all the fixes happen in there.