The wifi network could not be found on debian

[kepler19]

Hello,
wireless interface (wlo1) The wifi network could not be found on debian 9.

I can not connect to my wifi device on Debian 9, but when i am trying to connect to my neighbor wifi it connects without any issue, before i had not such issues on connecting.

i can connect to my wifi device from windows 10 and mobiles too.

How to solve it?

[Head_on_a_Stick]

How are you attempting to connect?

Are you absolutely sure that you have entered the password correctly?

Please post the output of

Code: Select all

ip link
lspci -knn | grep -iA2 net
systemctl list-unit-files --state=enabled

Be sure to use code tags when posting the output, thanks!

[kepler19]

HI, i am now on neighbor wifi connected. Yes i entered correct password, it also had remembered password. worked before fine.

Code: Select all

ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp1s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 38:63:bb:70:dc:a1 brd ff:ff:ff:ff:ff:ff
3: wlo1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DORMANT group default qlen 1000
    link/ether 10:08:b1:48:fc:29 brd ff:ff:ff:ff:ff:ff

Code: Select all

lspci -knn | grep -iA2 net
01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
        Subsystem: Hewlett-Packard Company RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [103c:2235]
        Kernel driver in use: r8169
        Kernel modules: r8169
02:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
        Subsystem: Hewlett-Packard Company RTL8723BE PCIe Wireless Network Adapter [103c:2231]
        Kernel driver in use: rtl8723be
        Kernel modules: rtl8723be

Code: Select all

systemctl list-unit-files --state=enabled
UNIT FILE                                  STATE  
cups.path                                  enabled
accounts-daemon.service                    enabled
anacron.service                            enabled
autovt@.service                            enabled
avahi-daemon.service                       enabled
binfmt-support.service                     enabled
bluetooth.service                          enabled
console-setup.service                      enabled
cron.service                               enabled
cups-browsed.service                       enabled
cups.service                               enabled
dbus-org.bluez.service                     enabled
dbus-org.freedesktop.Avahi.service         enabled
dbus-org.freedesktop.ModemManager1.service enabled
dbus-org.freedesktop.nm-dispatcher.service enabled
display-manager.service                    enabled
getty@.service                             enabled
irqbalance.service                         enabled
keyboard-setup.service                     enabled
ModemManager.service                       enabled
network-manager.service                    enabled
networking.service                         enabled
NetworkManager-dispatcher.service          enabled
NetworkManager-wait-online.service         enabled
NetworkManager.service                     enabled
pppd-dns.service                           enabled
rsyslog.service                            enabled
rtkit-daemon.service                       enabled
sddm.service                               enabled
syslog.service                             enabled
systemd-timesyncd.service                  enabled
ufw.service                                enabled
unattended-upgrades.service                enabled
avahi-daemon.socket                        enabled
cups.socket                                enabled
remote-fs.target                           enabled
anacron.timer                              enabled
apt-daily-upgrade.timer                    enabled
apt-daily.timer                            enabled

39 unit files listed.

[kepler19]

How are you attempting to connect?

Are you absolutely sure that you have entered the password correctly?

Please post the output of

Code: Select all

ip link
lspci -knn | grep -iA2 net
systemctl list-unit-files --state=enabled

Be sure to use code tags when posting the output, thanks!

Now it worked after i used your provided codes, what happened? Thanks friend.

[Head_on_a_Stick]

Now it worked after i used your provided codes, what happened?

Really? Those commands were diagnostic in nature and should not have changed the system configuration in any way.

Perhaps your router had a technical fault, is the firmware fully updated?

[kepler19]

Perhaps your router had a technical fault, is the firmware fully updated?

That router is provided by mu ISP and i have not permissions to access on it. so i do not know is it updated or not. Thanks.