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adb connection failed
#1
I can not connect adb using USB-C or TCP.

- Using USB type C to C
    no device

- Using tcp(ping is succeed)
    adb connect 192.168.1.134
    unable to connect to 192.168.1.134:5555: Connection refused

If someone succeeds, please help me.

Thank you!
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#2
It works fine for me, check the wiki here.
Note use of the top USB2 port has NOT been verified - looking at the schematic it seems it may in fact be the type 3 USB A port that is OTG. But for sure I have had no problems with the type C port
ROCKPro64 v2.1 2GB, SM961 128GB NVMe for rootfs, HDMI video & sound, Bluetooth keyboard & mouse
Started Bionic minimal - now Cosmic, Openbox desktop for general purpose daily PC.
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#3
I'm also trying to get this working. when I plugged into the USB 2.0 OTG port. nothing happened. I found a type-c to type-a cable and plugged it in. my computer recognized a new device.

I am using adb to sideload gapps from opengapps.org.

however the signature verification failed.
error: 21

it seems to be timing out at around 50% of file transfer.
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#4
I have the exact same problem.

adb devices return no device.
adb connect is falling despite that the ping is working.

I did try on android 7 and android 8. I also tried on all usb 2 ports. For usb c, I use a hub c to 3 and connect it to the MacBook pro. Also note that I tried on a MacPro with ubuntu.

lsusb on both machines, never show the rockpro64 :/ and adb is not working.

On the device itself I am developer mode and try all transfer mode possible (MTP, PTP...)

please help!
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#5
Actually, I bought a usb c to usb 3 and it works now.
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