Can't create a memory dump on iOS device: USBMuxConnectByPort: device = 3, port = 9000, result = 61

[JaneySprings]

Apple platform

iOS

Framework version

net10.0-*

Affected platform version

net10.0, iOS26, xcode26.1, DSRouter 9.0.657301

Description

I'm trying to collect a gcdump using the official instructions, but I get the error:

info: dotnet-dsrouter-61213[0]
      Successfully connected new device, id=3.

> dotnet-gcdump collect -p <PID>

fail: dotnet-dsrouter-61213[0]
      Failed USBMuxConnectByPort: device = 3, port = 9000, result = 61.

Steps to Reproduce

Try to collect gcdump on iOS device using the official guide:
https://github.com/dotnet/maui/wiki/Memory-Leaks

Did you find any workaround?

Simulator works fine

Relevant logs

Writing gcdump to '{PATH}.gcdump'...
0.0s: Creating type table flushing task
fail: dotnet-dsrouter-32689[0]
Failed USBMuxConnectByPort: device = 9, port = 9000, result = 61.
0.1s: [Error] Exception during gcdump: System.IO.EndOfStreamException: Unable to read beyond the end of the stream.

[rolfbjarne]

This happens when the port in question (9000) isn't open on the device.

This can happen either if the app isn't running, or it wasn't built with diagnostics support, or the correct environment variables weren't set at startup.

Can you try adding this to the csproj and see if that changes anything?

<PropertyGroup>
  <DiagnosticAddress>127.0.0.1</DiagnosticAddress>
  <DiagnosticPort>9000</DiagnosticPort>
  <DiagnosticSuspend>false</DiagnosticSuspend>
  <DiagnosticListenMode>listen</DiagnosticListenMode>
</PropertyGroup>

Note that you won't need to set DOTNET_DiagnosticPorts when launching the app with mlaunch if these variables are set.

[JaneySprings]

I build my app with your properties in project file:

dotnet build /Users/nromanov/Work/examples/MauiProfileTest/MauiProfileTest.csproj -p:Configuration=Debug -p:TargetFramework=net10.0-ios -p:RuntimeIdentifier=ios-arm64 -p:_BundlerDebug=true

And run it with the following command:

tools/bin/mlaunch --launchdev=./bin/Debug/net10.0-ios/ios-arm64/MauiProfileTest.app --devname=00008101-000551753E8A001E

But I get the same error from dsrouter(

[JaneySprings]

I also tried to create a mlaunch tcp-tunnel 9000:9000 before creating a dump, but it also doesn’t work