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Remote debugging comes to Rider 2018.3!

Maarten Balliauw

The latest Rider 2018.3 Early Access Preview (EAP) build brings remote debugging of .NET, .NET Core and Mono applications! By setting up an SSH connection, we can attach to a running process on a remote machine and step into code.

Better even, remote debugging works across platforms! For example, we can debug a .NET application running on a remote Linux machine, from our Windows box. Let’s see how this works.

Connecting the debugger to a remote server over SSH

With Rider 2018.3, it is now possible to debug a .NET, .NET Core or Mono application that is deployed on a remote machine. From the Run | Attach to Remote Process… menu, we can enumerate processes on a remote server, by connecting to it over SSH.

Of course, we will first have to set up such connection, which can be done from Rider’s settings under Build, Execution, Deployment | Debugger | Remote debug. We can also add a remote host the first time we use Run | Attach to Remote Process… Authentication with a remote host can be done using a password, an OpenSSH / Putty key pair, or using an OpenSSH configuration file and authentication agent.

Setup SSH session for remote debugging with Rider

The first time we now use the Run | Attach to Remote Process… action, Rider can connect to the remote machine and fetch a list of running processes. To do that, it requires the remote debugger tools to be uploaded and extracted on the machine, which can be done automatically.

Load Rider remote debugger tools on external machine

Note that when the unzip tool is installed on the remote machine, Rider will compress (and extract) the remote debugger tools to increase transfer speed.

Once we select a remote process, Rider will attach the debugger to it and allows us to pause execution, place breakpoints, inspect variables, and so on.

Once the remote debugger tools have been loaded first time, connecting to a remote host becomes much easier. Again using the Run | Attach to Remote Process… action, Rider now immeditaly lists remote processes and lets us attach to them:

Attach debugger to remote process in Rider and inspect variables

Once we select a remote process, Rider will attach the debugger to it and allows us to pause execution, place breakpoints, and so on.

Other debugger updates

Next to adding support for remote debugging, we have made a number of bugfixes and improvements to the debugger:

  • We added a new expression evaluation engine, which lets us use the latest C# syntax in debugger watches.
  • When inspecting variables, the context menu now lets us switch between decimal and hexadecimal for numeric values.
  • Support of pointer operations (arithmetic, derefencing) in watches for .NET, .NET core, Mono and Unity 2018.3+ (when the new runtime is used) is coming in the next EAP build

Download Rider 2018.3 EAP and give it a try! We’d love to hear your feedback!

#debugger #EAP #Rider
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56 Responses to Remote debugging comes to Rider 2018.3!

  1. Kirill Rakhman says:

    November 29, 2018

    Can I use this to debug an IIS application running on a Windows Server?

    • Maarten Balliauw says:

      November 29, 2018

      If you can SSH into the machine, you should be able to debug it.

  2. Dew Drop - November 30, 2018 (#2850) - Morning Dew says:

    November 30, 2018

    […] Remote debugging comes to Rider 2018.3! (Maarten Balliauw) […]

  3. jd says:

    November 30, 2018

    Nice move. Any update on this one ?
    https://youtrack.jetbrains.com/issue/RIDER-2704

    Regards

    • Maarten Balliauw says:

      November 30, 2018

      Not yet, keep an eye on that issue though.

  4. Eli says:

    November 30, 2018

    This is really cool to have, just one thing that is unclear to me, what setup is required on the server (besides ssh ofc)

    • Maarten Balliauw says:

      November 30, 2018

      Hi Eli,

      SSH access of course, and a user that has privileges to look at the running process(es) you want to attach to.

  5. Piotr says:

    December 6, 2018

    Can I debug a .NET application on a remote Windows machine? My local machine runs on Linux.

    • Maarten Balliauw says:

      December 6, 2018

      That should work, if the remote machine can be accessed over SSH (and the user has access to the process you want to debug)

  6. Pavel says:

    December 7, 2018

    Super awesome! .NET diagnostic tooling is really lacking on Linux, it is a pain sometimes. Great step in that direction!

  7. Nickie S. says:

    December 7, 2018

    Are there any plans for adding copying functionality, so I can edit, build and debug program without leaving IDE?

  8. Bob Gonsalves says:

    December 17, 2018

    Will this effectively replace the Attach to Android Process that was in MonoDevelop? Any chance we can get a tutorial on how to do that?

    • arseny_chernyaev says:

      December 18, 2018

      Rider uses the same algorithm as MonoDevelop, for now. What would you like us to improve in attach to Android process?

      • Bob Gonsalves says:

        December 19, 2018

        Right now I don’t have any suggested improvements. I’ll download the EAP package and see how it feels..

        • Bob Gonsalves says:

          June 4, 2019

          It turns out that Run>Attach to Unity Process works just fine for me!

      • Daivid Silverio says:

        November 20, 2019

        Actually, it would be great to be able to attach to Xamarin android processes like the Android Studio IDE can do. Currently if I try to attach to a process when a debuggable application is running I get nothing.

  9. ydrolet says:

    January 28, 2019

    Thank you very much for this great feature! Does the remote debugger tools that are uploaded to the remote machine support ARM? I would like to remote debug .NET Core program on a Raspberry Pi. Is it possible? If not, do you have plans to support ARM in the future?

  10. on3al says:

    January 31, 2019

    Did this functionality make it into the released version? Is this functionality available when running Rider on OSX?

    • Maarten Balliauw says:

      February 4, 2019

      Absolutely! Should be availabel from the Run menu.

  11. George says:

    March 18, 2019

    Can we use remote Debugging to debug a local docker container built from a docker-compose.yml?

    I am able to actually hit the container using the “Attach to remote Process” feature at root@127.0.0.1:port

    But i get a:

    info: Microsoft.AspNetCore.Server.Kestrel[17]
    api_1 | Connection id “0HLLBKT2RMC3P” bad request data: “Invalid request line: ‘SSH-2.0-JSCH-0.1.54\x0A'”
    api_1 | Microsoft.AspNetCore.Server.Kestrel.Core.BadHttpRequestException: Invalid request line: ‘SSH-2.0-JSCH-0.1.54\x0A’
    api_1 | at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpParser`1.RejectRequestLine(Byte* requestLine, Int32 length)
    api_1 | at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpParser`1.GetUnknownMethod(Byte* data, Int32 length, Int32& methodLength)
    api_1 | at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpParser`1.ParseRequestLine(TRequestHandler handler, Byte* data, Int32 length)
    api_1 | at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpParser`1.ParseRequestLine(TRequestHandler handler, ReadOnlySequence`1& buffer, SequencePosition& consumed, SequencePosition& examined)
    api_1 | at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpParser`1.Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.IHttpParser.ParseRequestLine(TRequestHandler handler, ReadOnlySequence`1& buffer, SequencePosition& consumed, SequencePosition& examined)
    api_1 | at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.Http1Connection.TakeStartLine(ReadOnlySequence`1 buffer, SequencePosition& consumed, SequencePosition& examined)
    api_1 | at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.Http1Connection.ParseRequest(ReadOnlySequence`1 buffer, SequencePosition& consumed, SequencePosition& examined)
    api_1 | at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.Http1Connection.TryParseRequest(ReadResult result, Boolean& endConnection)
    api_1 | at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequests[TContext](IHttpApplication`1 application)
    api_1 | at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProcessRequestsAsync[TContext](IHttpApplication`1 application)

    I am not sure this is a rider issue, a docker issue, or a dotnet core setup issue.

  12. vb says:

    April 18, 2019

    Is Edit and continue is supported

  13. Kirill Rakhman says:

    April 26, 2019

    Is there a way to debug a Docker image running in a Kubernetes pod? I can open a shell using

    kubectl exec -it POD_NAME — /bin/bash

    but how can I tell Rider to use that to connect?

  14. Camilla says:

    June 19, 2019

    I’m running Windows 10 in Parallels with IIS and want to debug the application from Rider on MacOs. Is this possible? I’m a little bit confused by the setup, for example – “To do that, it requires the remote debugger tools to be uploaded and extracted on the machine, which can be done automatically.” – Which remote debugger tools are you referring to and how to do this?

    I installed Visual Studio 2017 Remote Debugger on my Windows installation but I don’t get the option to load the tools in Rider. I have enabled SSH on Windows and verified the connection. I’m very new to .NET development, so I’m sorry if this should be very obvious. Thanks!

  15. Sergey Bezkrovnyi says:

    July 11, 2019

    Hi Maarten.
    I need to debug service running at the VM
    – OS: Linux 5.0.6
    – IP: 127.0.0.1
    – Port: 18022

    To check Rider 2019.1.3 possibility to do this I did the following steps:

    1. Build test ConsoleApp1 application with Rider 2019.1.3
    2. Copy ConsoleApp1.exe, ConsoleApp1.pdb to Linux VM, folder /test_debug
    3. Set /test_debug as current directory
    3. As root run command
    mono –debugger-agent=address=127.0.0.1:18022,server=y,transport=dt_socket –debug ConsoleApp1.exe

    4. In Rider created remote host with parameters host: 127.0.0.1; port: 18022 (credentials of root); save changes
    5. Do Run -> Attach To remote Process -> select created host
    6. I see popup “loading” and after couple of sec “No process to attach to”

    Please, clarify what step I missed (did wrong)?

    • Maarten Balliauw says:

      July 11, 2019

      Can you try without passing in those debugger agent parameters? Rider will use its own debugger and should not need the debugger agent listening.

  16. Sergey Bezkrovnyi says:

    July 11, 2019

    At VM:
    mono ConsoleApp1.exe

    at Win, RIder,
    Attach to Remote Process -> select host -> hang with popup “Loading” > 2min
    Then I stopped them

    • Maarten Balliauw says:

      July 11, 2019

      Would you mind using the Help | Report a Bug menu and make sure to upload logs? We’re then able to see what is causing the issue.

      • Sergey Bezkrovnyi says:

        July 11, 2019

        How can send you ZIp file for folder
        C:\Users\sergey.bezkrovnyi.DO\.Rider2019.1\system\log

  17. Sergey Bezkrovnyi says:

    July 11, 2019

    Registered as RIDER-30033 by Sergey Bezkrovnyi

  18. Robert Wagner says:

    July 30, 2019

    Hi,

    I can’t get this to work. I’ve setup SSH and I have a .NET FX process running on the machine. When I attempt to remote debug, I get the message “No process to attach to”.

    Rider 2019.1.2
    Remote Machine is Windows 2019 Server Core

    • Maarten Balliauw says:

      July 30, 2019

      Hi Robert,

      This is a known issue and should be fixed with the next EAP release (late this/early next week) – http://www.jetbrains.com/rider/eap

      • Xiangyi says:

        December 10, 2019

        Hi,

        I am still not able to attach the remote debugger with rider 2019.2.3 (showing ‘no process to attach to’). It used to work flawlessly in rider 2018.

        Has the issue been fixed? Thank you.

  19. Tobias Punke says:

    October 7, 2019

    Hi,

    where are the fingerprints / known_hosts saved? When the fingerprint changes, nothing happens anymore. Where can I delete old fingerprints?

    • Tobias Punke says:

      October 7, 2019

      Okay, restarting Rider seems to be enough though.

  20. Krzysztof says:

    October 30, 2019

    After upload tools for debug collecting processes never ends.
    Application to debug is on raspberry pi in net core.
    I’m using Rider 2019.3 EAP on Windows 10.
    Any suggestions?

  21. Alex says:

    November 27, 2019

    Does Rider support remote debugging on linux-arm(64) targets?

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