--- title: 'Network Manager error on Linux: "No network connection", "device is strictly unmanaged"' url: 'https://ra1ahq.blog/en/oshibka-network-manager-v-linux-net-podklyucheniya-k-seti-device-is-strictly-unmanaged' markdown: 'https://ra1ahq.blog/en/oshibka-network-manager-v-linux-net-podklyucheniya-k-seti-device-is-strictly-unmanaged.md' lang: en date: '2023-12-22' description: 'In one of the experimental Linux installations I saw a network error. It manifests itself in the fact that ping passes, but Networkmanager shows the “No network” icon and network management through “Connection settings” does not work. Connec' taxonomy: category: - blog tag: - Linux archives_month: - dec_2023 archives_year: - '2023' --- # Network Manager error on Linux: "No network connection", "device is strictly unmanaged" 22 December 2023 11:52 ### Network Manager error on Linux: "No network connection", "device is strictly unmanaged" [Linux](https://ra1ahq.blog/en/tag:Linux) 22 December 2023 11:52 In one of the experimental Linux installations I saw a network error. It manifests itself in the fact that ping passes, but Networkmanager shows the “No network” icon and network management through “Connection settings” does not work. Connection settings - Network Manager settings (icon in the corner of the screen). If you have a network card, an Ethernet connection is added automatically. ### Symptoms **Problem #1:** it is impossible to connect to such a network, the error is "Connection 'Wired connection 1' is not available on device eth0 because device is strictly unmanaged" **Problem #2:** the network icon "Network Manager" is inactive, or rather shows the absence of a network. **Problem #3:** "Connection details" are not displayed for a wired connection. It is impossible to view the IP address graphically. **Problem #4:** connection settings - Last used -**"Never"**. ### Solution 1)**Correct the file`/etc/NetworkManager/NetworkManager.conf`** ``` sudo nano /etc/NetworkManager/NetworkManager.conf ``` Instead of \[ifupdown\] *managed=false* specify \[ifupdown\]**managed=true**: ``` [main] plugins=ifupdown,keyfile [ifupdown] managed=true [device] wifi.scan-rand-mac-address=no ``` This will solve the "device is strictly unmanaged" problem 2\) Make sure there are no unmanaged devices in the folder `/etc/NetworkManager/` Normally, the following commands should not output anything to the screen: ``` sudo grep -ri unmanaged-devices /etc/NetworkManager/conf.d/ sudo grep -ri unmanaged-devices /etc/NetworkManager/ ``` 4\) For the second problem: add ethernet to the list of exceptions of unmanaged devices in the file `/usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf` ``` sudo nano /usr/lib/NetworkManager/conf.d/10-globally-managed-devices.conf ``` Normally, the contents of the file should be: `[keyfile]` `unmanaged-devices=*,except:type:wifi,except:type:gsm,except:type:cdma,except:type:ethernet` If `except:type:ethernet` no - add to the end of the line **,except:type:ethernet** and save the file. 5\) Since modern Linux uses netplan with a description of a typical connection in a configuration file in yaml format, we check netplan: ``` ls /etc/netplan/ cat 00-installer-config.yaml ``` ``` network: renderer: networkd ethernets: enp1s10: dhcp4: true dhcp6: true version: 2 ``` The name of the network card must match the output of the command `ip a`. For example,**enp1s10**. For more information about netplan, see [article](https://ra1ahq.blog/en/netplan-kak-zamena-etc-network-interfaces). If the configuration is correct (see above), apply it: ``` sudo netplan apply ``` 6\) Start and allow automatic startup of network services: ``` sudo systemctl start systemd-networkd sudo systemctl enable systemd-networkd sudo systemctl start NetworkManager.service sudo systemctl enable NetworkManager.service ``` 7\) Re-read the configuration of the NetworkManager service ``` sudo systemctl reload NetworkManager.service ``` The NetworkManager applet icon in the status bar also changes to a wired RJ-45 jack symbol. After the last action, the network appears and can be managed (right mouse button - connection parameters). ### Default IPv4 Settings You can change the wired connection settings in Network Nanager to suit your needs. Below are the default settings: **Basic**: "Connect automatically to a network with priority" - 0, "All users can connect to this network." **Ethernet**: - Device - enp2s0 - MTU - automatic - Wake on LAN - default - Channel matching - Ignore **IPv4 parameters:** \*Address: 192.168.1.101 - Network mask: 24 - Gateway: 192.168.1.1 The fixed IPv4 address can be changed within the local network behind the Internet router. --- **Source link:** \*[Ubuntu Error: Connection activation failed: Connection is not available on device because device is strictly unmanaged](https://www.nixcraft.com/t/ubuntu-error-connection-activation-failed-connection-is-not-available-on-device-because-device-is-strictly-unmanaged/4533/2) ### Related publications [ ![](https://ra1ahq.blog/images/f/3/a/2/c/f3a2c07ef5b32c0308ab703405a5a5ca87b75283-archer-ac600-728.webp) Installing the kernel driver for the TP-Link Wi-Fi adapter after updating the Debian OS ](https://ra1ahq.blog/en/ustanovka-draivera-yadra-dlya-wi-fi-adaptera-tp-link-posle-obnovleniya-os-debian) [ ![](https://ra1ahq.blog/images/d/2/5/c/7/d25c7282750b398f71041fb8b90640b692e7e4b8-decibelfmtitle.png) Linux Cinnamon Desktop Applets for Listening to Internet Radio Stations ](https://ra1ahq.blog/en/applety-dlya-rabochego-stola-linux-cinnamon-dlya-proslushivaniya-internet-radiostancii) [ ![No picture](https://ra1ahq.blog/user/themes/mytheme/images/no-image.png) Passing a parameter to a Linux module/driver ](https://ra1ahq.blog/en/peredacha-parametra-modulyu-draiveru-linux) [ ![](https://ra1ahq.blog/images/5/c/4/e/a/5c4ea9c8c3f0b4dd890116d8fe7cbadfdb9814ba-archer-ac600.webp) Installing the TP-Link Archer T600U Nano Wi-Fi adapter driver in Debian 13 "Trixie" ](https://ra1ahq.blog/en/ustanovka-draivera-wi-fi-adaptera-tp-link-archer-t600u-nano-v-debian-13-trixie) [ ![](https://ra1ahq.blog/images/b/f/f/0/f/bff0f99f5897e0420fac9a6eef7254247f39c29d-pulseaudio-equalizer.png) Installing the audio equalizer pulseaudio-equalizer-ladspa on Linux ](https://ra1ahq.blog/en/ustanovka-v-linux-ekvalaizera-zvuka-pulseaudio-equalizer-ladspa) [ Backward](https://ra1ahq.blog/en/priyom-hamdrm-i-sstv-v-programme-qsstv-cherez-websdr "Previuous page") [ Forward ](https://ra1ahq.blog/en/poluchenie-predlozhennykh-proposed-obnovlenii-v-linux "Next page") ## Languages - 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