Exception attempting to connect to Observatory: SocketException: OS Error

[waltcow]

flutter attach --device-id=flutter-tester --debug-port=49494 -v

[  +23 ms] executing: [/Users/me/Flutter/flutter/] git -c log.showSignature=false log -n 1 --pretty=format:%H
[  +40 ms] Exit code 0 from: git -c log.showSignature=false log -n 1 --pretty=format:%H
[        ] 2449928d7ca4ae1bde00694627b2099417d6a5e6
[        ] executing: [/Users/me/Flutter/flutter/] git describe --match v*.*.* --first-parent --long --tags
[  +22 ms] Exit code 0 from: git describe --match v*.*.* --first-parent --long --tags
[        ] v1.10.1-14-g2449928d7
[   +7 ms] executing: [/Users/me/Flutter/flutter/] git rev-parse --abbrev-ref --symbolic @{u}
[  +10 ms] Exit code 0 from: git rev-parse --abbrev-ref --symbolic @{u}
[        ] origin/master
[        ] executing: [/Users/me/Flutter/flutter/] git ls-remote --get-url origin
[   +9 ms] Exit code 0 from: git ls-remote --get-url origin
[        ] https://github.com/flutter/flutter.git
[  +51 ms] executing: [/Users/me/Flutter/flutter/] git rev-parse --abbrev-ref HEAD
[  +11 ms] Exit code 0 from: git rev-parse --abbrev-ref HEAD
[        ] master
[ +148 ms] executing: /usr/local/Caskroom/android-sdk/25.2.3/platform-tools/adb devices -l
[  +24 ms] Exit code 0 from: /usr/local/Caskroom/android-sdk/25.2.3/platform-tools/adb devices -l
[        ] List of devices attached
[  +11 ms] executing: /Users/me/Flutter/flutter/bin/cache/artifacts/libimobiledevice/idevice_id -h
[ +148 ms] /usr/bin/xcrun simctl list --json devices
[ +205 ms] Artifact Instance of 'AndroidEngineArtifacts' is not required, skipping update.
[   +2 ms] Artifact Instance of 'IOSEngineArtifacts' is not required, skipping update.
[   +2 ms] Artifact Instance of 'FlutterWebSdk' is not required, skipping update.
[   +3 ms] Artifact Instance of 'WindowsEngineArtifacts' is not required, skipping update.
[   +3 ms] Artifact Instance of 'LinuxEngineArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'LinuxFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'MacOSFuchsiaSDKArtifacts' is not required, skipping update.
[        ] Artifact Instance of 'FlutterRunnerSDKArtifacts' is not required, skipping update.
[  +61 ms] Connecting to service protocol: http://127.0.0.1:49494/
[  +29 ms] Exception attempting to connect to Observatory: SocketException: OS Error: Connection refused, errno = 61, address = 127.0.0.1,
port = 56333
[   +3 ms] This was attempt #1. Will retry in 0:00:00.100000.
[ +107 ms] Exception attempting to connect to Observatory: SocketException: OS Error: Connection refused, errno = 61, address = 127.0.0.1,
port = 56334
[        ] This was attempt #2. Will retry in 0:00:00.200000.
[ +207 ms] Exception attempting to connect to Observatory: SocketException: OS Error: Connection refused, errno = 61, address = 127.0.0.1,
port = 56335
[   +1 ms] This was attempt #3. Will retry in 0:00:00.400000.

Flutter.app is running, but attach port is not woking, don't know why ?