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This usually means you have the wrong ta.key installed on Server or client.

Check or Make sure the are the same.

Excellent tools are nmap and fping
nmap -sP 192.168.1.1/24

fping -a -r 0 -g 192.168.1.1/24

But if you don't want to install a new tools,
you can try with the default ping.

for i in {1..254}; do (ping -vc 1 -t 4 192.168.1.$i); done

Or, if you want a clearer output, add grep:
for i in {1 ...

It looks like there is problem with the key.

If you can post part of your server/client config
we can verify a little more.

You can check with hdparm :
sudo hdparm /dev/sdc

/dev/sdc:
multcount = 0 (off)
readonly = 1 (on)
readahead = 256 (on)
geometry = 15904/64/32, sectors = 32571392, start = 0

Change it with:
sudo hdparm -r0 /dev/sdc1

If it doesn't work, it might be a problem with the USB drive.

Best is to erase the partitions with fdisk or gparted
and create new ones.

ho do I remove write protection on a usb drive ?

I have a drive that I want to format.
but when I try to do it under windows,
I get the message that the drive is write-protected.

if you have the latest version of Debian, Buster.
it probably uses systemd.
The config files are in /etc/systemd/

You can check the current NTP server with:
systemctl status systemd-timesyncd

edit the file: /etc/systemd/timesyncd.conf
add the server:
# add to the end : set NTP server for your ...

you can use the command: It shows the username

You can use :
ip address

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever ...

Pressing F10 should get you into bios, where you can set the boot order.


DEL and F2 tend to be the most popular hotkeys for PCs, but if you’re unsure of what your brand’s hotkey is, this list of common BIOS keys by brand may help.
Acer: F2 or DEL
ASUS: F2 for all PCs, F2 or DEL for motherboards ...