Pi3 - Wifi stopped working

[SteanerSVK]

Hi. I'm using Raspbian Stretch 4.9.59-v7+ on my Raspberry Pi 3 and my wifi stopped working. I've been trying editing the network files, but I can't get it working. When I click on Network upper right corner it says "No wireless interfaces found". It worked yesterday, but today it just don't work.
That's my /etc/network/interfaces

# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

auto wlan0
iface lo inet loopback

# allow-hotplug wlan0
iface wlan0 inet manual
wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

iface default inet static
address 192.168.1.23
netmask 255.255.255.0
gateway 192.168.1.1

In /etc/dhcpcd.conf I've added these lines:

interface wlan0
static ip_address=192.168.1.23/24
static routers=192.168.1.1
static domain_name_servers=192.168.1.1 8.8.8.8

And my /etc/wpa_supplicant/wpa_supplicant.conf look like that:

ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1
country=SK

network={
ssid="myssid"
psk="mypass"
key_mgmt=WPA-PSK
}

[SurferTim]

There should not be anything in /etc/network/interfaces except this for a wifi client application.

Code: Select all

# interfaces(5) file used by ifup(8) and ifdown(8)

# Please note that this file is written to be used with dhcpcd
# For static IP, consult /etc/dhcpcd.conf and 'man dhcpcd.conf'

# Include files from /etc/network/interfaces.d:
source-directory /etc/network/interfaces.d

Only bridge interfaces go in here now.

[SteanerSVK]

I did what you said, and when I type the command: sudo ifdown wlan0 && sudo ifup wlan0 it says:
ifdown: interface wlan0 not configured
ifup: unknown interface wlan0

[SteanerSVK]

Oh, okay. It's working, thank you. Now, I probably can't use command sudo ifdown wlan0 but sudo ip link set wlan0 down, right?

[SurferTim]

Oh, okay. It's working, thank you. Now, I probably can't use command sudo ifdown wlan0 but sudo ip link set wlan0 down, right?

That is correct.