Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

"ledgerblue.commException.CommException: Exception : No dongle found"

See original GitHub issue

OS: MacOS Sierra 10.12.5 device: Ledger Nano S firmware: 1.4.1 Script: Any Python: Either 2.7 or 3 - same results. command: python -m ledgerblue.checkGenuine --targetId 0x31100003 Version: 0.1.17 (commit 01ac90675898c14c5d2b1cef379cfdcc5774fe4f - ie. non pip version) trace (for checkGenuine.py - but replace for any script):

Traceback (most recent call last):
  File "/usr/local/Cellar/python3/3.6.4_2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/local/Cellar/python3/3.6.4_2/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/Users/tadhgriordan/Documents/blue-loader-python/ledgerblue/checkGenuine.py", line 137, in <module>
    dongle = getDongle(args.apdu)
  File "/Users/tadhgriordan/Documents/blue-loader-python/ledgerblue/comm.py", line 221, in getDongle
    raise CommException("No dongle found")
ledgerblue.commException.CommException: Exception : No dongle found

Ledger is recognised by my machine for all Apps, Ledger Manager, MyEtherWallet etc. running system_profiler SPUSBDataType:

Nano S:

     Product ID: 0x0001
     Vendor ID: 0x2c97
     Version: 2.00
     Serial Number: 0001
     Speed: Up to 12 Mb/sec
     Manufacturer: Ledger
     Location ID: 0x14400000 / 8
     Current Available (mA): 500
     Current Required (mA): 100
     Extra Operating Current (mA): 0

I have another Nano S on 1.3 which works as normal.