PuTTY - Unable to open connection to /dev/ttyUSB0: ....Permission denied

English Network/Internet
1

With Yast I added additional groups to my user account, but mainly the dialout group. I have so many apps open and do not want to close everything and logout to update the changes. I did a

su - $USER

and confirmed the update
BEFORE:

nasheayahu@kbbn7studio:~> id
uid=1000(nasheayahu) gid=100(users) groups=100(users),42(trusted)

AFTER:

nasheayahu@kbbn7studio:~> id
uid=1000(nasheayahu) gid=100(users) groups=100(users),36(kvm),42(trusted),107(qemu),108(libvirt),462(wireshark),474(audit),476(flatpak),477(pulse),478(pulse-access),483(video),489(disk),490(dialout),491(cdrom),492(audio),494(kmem)

but I keep getting:

Screenshot_20230902_114548
Screenshot_20230902_114548994×690 17.7 KB

Permission are:

kbbn7studio:/dev # ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 Sep  2 11:20 /dev/ttyUSB0

Does this mean I’m still forced to logout or is there additional steps needed?

2

@nasheayahu:

Please take a look at the directory ‘/dev/’ –

I suspect that, you’ll not find a device named “ttyUSB0” …

However, there are, usually, the devices ttyS0 … ttyS31 …

Please check your PuTTY configuration – <https://the.earth.li/~sgtatham/putty/0.79/htmldoc/Chapter4.html#config-ssh-tty>

1 Like
3

You think that what he shows is fake?

kbbn7studio:/dev # ls -l /dev/ttyUSB0
crw-rw---- 1 root dialout 188, 0 Sep  2 11:20 /dev/ttyUSB0
1 Like
4

That is nonsense.

5

No such device on this Leap 15.5 system –

 > LANG=C l /dev/ttyU*
ls: cannot access '/dev/ttyU*': No such file or directory
 > file /dev/ttyUSB0
/dev/ttyUSB0: cannot open `/dev/ttyUSB0' (No such file or directory)
 >
6

But the OP shows clearly he has it on his 15.4 system.

It probably is created by udevd when an USB device that supports data communication ports is connected.

7

It is rather unclear how you started PuTTY in the first place. If PuTTY was started from your desktop environment menu (not from the terminal where you executed the second id command) - yes, you need to logout and login to apply new group membership.

1 Like
8

I don’t use Putty but I use Minicom with usb to serial converter so I think we are in similar situation.
I add my user to the following groups :

  • dialout
  • lock
  • uucp (maybe this group is not really necessary. I had to add it in the past when I used VMware Player and I wanted to use usb to serial thru virtual machine)
1 Like
9

@dcurtisfra: Then you don’t have such a device present (it is created dynamically by the supporting usbserial module).