This section lists common problems and possible solutions. If you experience other problems or would like to add a solution for a problem feel free to open an issue in our Github project or send us an email to firstname.lastname@example.org.
Permission denied when accessing the USB-Mux¶
Problem: The control software outputs an "Access denied" message and does not find the specified USB-Mux.
In the following example a user tries to access the USB-Mux without previously installing the udev-rule:
$ usbmuxctl --serial 22 status Access denied while checking serial number for device: 1-5.1 Failed to connect to device: Failed to find the defined USB-Mux
To fix this issue either run the tool as root (e.g. using
or setup an udev-rule that grants access to your user.
The chapter Using as non-root user for setup
Make sure to reload the udev config, re-attach the device and re-login
into your device after installing the rule.
Also make sure that the group name specified in the udev rule appears
in the output of the
$ groups … plugdev …