Fatal exception in DebugThread loop when calling two debuggers

I have the following error when I’m trying run Sidekiq and Rails from Visual Studio code:

Fatal exception in DebugThread loop: Address already in use - bind(2) for "127.0.0.1" port 1234
Backtrace:
/Users/cameron/.rbenv/versions/2.2.5/lib/ruby/gems/2.2.0/gems/ruby-debug-ide-0.6.1/lib/ruby-debug-ide.rb:114:in `initialize'
  from: /Users/cameron/.rbenv/versions/2.2.5/lib/ruby/gems/2.2.0/gems/ruby-debug-ide-0.6.1/lib/ruby-debug-ide.rb:114:in `new'
  from: /Users/cameron/.rbenv/versions/2.2.5/lib/ruby/gems/2.2.0/gems/ruby-debug-ide-0.6.1/lib/ruby-debug-ide.rb:114:in `block in start_control'
WARN: Unresolved specs during Gem::Specification.reset:
      rake (>= 0.8.1)
WARN: Clearing out unresolved specs.
Please report a bug if this causes problems.

The launch.json looks as follows:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Listen for rdebug-ide",
            "type": "Ruby",
            "request": "attach",
            "cwd": "${workspaceRoot}",
            "remoteHost": "127.0.0.1",
            "remotePort": "1234",
            "remoteWorkspaceRoot": "${workspaceRoot}"
        },
        {
            "name": "Rails server",
            "type": "Ruby",
            "request": "launch",
            "cwd": "${workspaceRoot}",
            "program": "${workspaceRoot}/bin/rails",
            "args": [
                "server",
                "-p",
                "3131"
            ]
        },
        {
            "name": "Sidekiq",
            "type": "Ruby",
            "request": "launch",
            "cwd": "${workspaceRoot}",
            "program": "${workspaceRoot}/bin/bundle",
            "args": [
                "exec",
                "sidekiq"
            ]
        }
    ],
    "compounds": [
        {
            "name": "Server/Client",
            "configurations": ["Rails server", "Sidekiq"]
        }
    ]
}

Even if I try and call them separately or using the compound I get that error. I’m only able to get sidekiq running with my Rails app by calling bundle exec sidekiq manually in the terminal.

Why am I getting this error?

Operating system: macOS High Sierra VS Code: Version 1.22.2 (1.22.2)

[mtsh0]

hi, i had same error today. i searched this error, and hit below similar problem(and approach)!! (in Japanese) げ！ローカルサーバーを切らずにターミナルを消しちゃった！ i think this error caused by you got off the terminal without turning off the local server.

you may solve this problem with 2steps.

1. run below command in terminal with port number after IP address

lsof -i :1234
# in my case
#=> COMMAND   PID USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
#=> ruby    83410 username    7u  IPv4 0x992a0bd9da1c7fdf      0t0  TCP localhost:sear

this command indicates process lists connect currently.

1. run below command to kill this port proccess.

kill -QUIT <PID>
# in mycase 
# kill -QUIT 83410

and It became available. i hope my comments help you!!

[minkir014]

@golubov-andrey Have you tried that? If so, tell me so that I will try it too.