Questions tagged [networking]

Managing and using network connectivity on a Ubuntu system

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USB Ethernet + thunderbolt errors

Currently having major issues with thunderbolt ethernet adapter. The device is a "Razer Core X" thunderbolt eGPU enclosure which has a built in USB3 hub and gigabit ethernet port. Essentially a very ...
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Ubuntu 18.04.2 LTS server - network configuration problem during setup

When installing from current server iso's in a VMWare VM and without a DHCP Server present, both Ubuntu installers are not able to manualy configure a ethernet interface. With the ubuntu-18.04.2-...
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9 votes
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Can't access GitHub via Google Chrome?

I successfully run the command ping github.com. Output is like: PING github.com (192.30.253.112) 56(84) bytes of data. 64 bytes from lb-192-30-253-112-iad.github.com (192.30.253.112): icmp_seq=1 ttl=...
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8 votes
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756 views

NetHogs showing suspicious (outgoing) traffic to random ports from root on Ubuntu 16.04

Using NetHogs on an Ubuntu 16.04 (web) server, i.e. on a machine where no consumer applications or web browsers are installed, besides traffic that is to be expected (HTTP and SSH) PID USER ...
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8 votes
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A stop job is running for Raise network interfaces (/1min 31s)

When I am trying to shutdown my pc running ubuntu 16.04.5 it will hang on this line: A stop job is running for Raise network interfaces (1s/1min 31s) This is my /etc/network/interfaces file: # This ...
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8 votes
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7k views

Cisco AnyConnect: Posture Assessment Failed: CSD library signature verification failed

All of a sudden AnyConnect stopped working. Version 4.5 on ubuntu 16.04. I'm now getting the following error when trying to connect. Any ideas on how to resolve it?
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wpa_supplicant[949]: wlan0: Failed to initiate sched scan

I installed ubuntu 14.04 lts with gnome, I connect normally to wifi of my house, but in my college i can't, my colleges wifi is an open wifi with a html login page. My notebook is a dell Inspiron 14. ...
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7 votes
0 answers
761 views

Cannot Get Xdmx to work with two Ubuntu Computers (xinit error)

I have two computers running Ubuntu 16.04 with Unity, and I'd really like to use the distributed multihead (Xdmx) software in order to use one of the computers as a second monitor, instead of just ...
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  • 171
7 votes
1 answer
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How do I remove the long name given to my internet connection?

The other day my computer randomly started displaying the full name of my ethernet controller as you can see here: I'm fine with it saying Ethernet Controller like it used to but having the whole ...
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7 votes
2 answers
9k views

Can't control connection bit rate using iwconfig with Atheros TL-WN821N (AR7010)

I'm trying to reduce the connection bit rate on my Atheros TP-Link TL-WN821N v3 usb wifi adapter due to frequent instability issues (reported connection speed goes down to 1Mb/s and I have to ...
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7 votes
2 answers
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How to disconnect internet when VPN fails?

Normally I'm connected to the Internet with a VPN, but sometimes it fails and some programs may automatically start to use the default unsecure connection. How do I disconnect all the internet until ...
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7 votes
4 answers
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Wifi connected but Internet drops frequently

I spent more than 2 weeks searching for a solution to the following problem without success: On my Ubuntu 18.04, I am connected to a Wifi (named "SmartCampus") but the internet keeps dropping ...
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6 votes
1 answer
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Wifi keeps disconnecting (Ubuntu 20.04)

I have a dual boot Windows 10 and Ubuntu 20.04 machine. I can connect to Wifi fine on Windows, but when using Ubuntu it disconnects every 10-20 minutes or so. When this happens, I can always get it ...
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  • 171
6 votes
0 answers
624 views

Network Activation fails for wifi

I have a BrosTrend AC3L device. It worked initially an then I patched to latest 20.04 and it seems to have developed this behaior. The devices comes up and connects to the network and then fails to ...
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6 votes
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5k views

Cannot disconnect from NordVPN

System Info: Ubuntu 18.04.1 LTS NordVPN Version 2.0.0 I recently installed the nordvpn-release_1.0.0_all.deb following these instructions. I'm able to connect to a VPN server via terminal using ...
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6 votes
1 answer
421 views

Torque: Unauthorized Request

Following this guide: https://jabriffa.wordpress.com/2015/02/11/installing-torquepbs-job-scheduler-on-ubuntu-14-04-lts/ I installed TORQUE on Ubuntu 16-04-lts (he claims the process works the same ...
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6 votes
0 answers
3k views

How to reset netplan to default in 18.04?

I tried creating a network bridge through Virtual Machine Manager for KVM. Now my Ubuntu network connection depends on my Windows KVM being booted. Since creating this bridge when Ubuntu is booted ...
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6 votes
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How to automatically bring up CAN interface in Ubuntu 17.10

In previous versions of Ubuntu I have been using this script to automatically bring up an network interface for a USB to CAN bridge device, whenever the device is plugged in: $ cat /etc/network/...
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  • 819
6 votes
1 answer
2k views

Why Speed and duplex Unknown?

I'm adding a Network card (OneConnect 10Gb) on Ubuntu 16.04 and run the ethtool command but output shows speed and duplex unknown!. Any idea how to fix this problem? xxx:~# ethtool enp12s0f0 ...
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  • 61
6 votes
1 answer
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Apply static IP address change in /etc/network/interfaces in Ubuntu 16.04

TL;DR: In Ubuntu 14.04, If you change a static IP address in /etc/network/interfaces and apply the changes with ifdown and then ifup command everything works fine. But this sequence is not working in ...
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6 votes
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Problem with PBISOpen and Ubuntu 14.04LTS

I'm testing openpbis 8.3 version and I have authentication problem when I'm trying to open new session on Ubuntu 14.04 LTS, not in local network but only in distant network. Adding the computer on ...
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  • 61
6 votes
3 answers
33k views

Can't connect to WiFi with "Connection activation failed" error after upgrade from 14.04 -> 15.04

I recently upgraded from 14.04 to 14.10 to 15.04 in succession. I lost internet capabilities each time, thanks to my having to use a Realtek WiFi dongle. I was able to resolve those issues both times,...
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6 votes
1 answer
888 views

(32) Ad-Hoc mode is not supported by this device. - 13.10 on i5 NUC

Not sure if this is an Ubuntu issue or intel issue. Any insights will be appreciated. I have an intel NUC (D54250WYK) w/ intel 7260 wireless adapter and Ubuntu 13.10. I can connect to my local wi-...
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6 votes
1 answer
23k views

Getting WiFi AP working with hostapd and isc-dhcp-server [Xubuntu 14.04]

I have tried using ap-hotspot from WebUpd8, and it did not work for me in 13.10 or 14.04, so I have been working on getting hostapd manually set up, using isc-dhcp-server since dnsmasq was having ...
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6 votes
0 answers
953 views

How can I connect to Microsoft Direct Access?

My company has moved from Cisco VPN to Microsoft Direct Access. I was using network-manager-vpnc to connect from Ubuntu before. Can I use the same to connect to direct access? If not, how can I ...
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5 votes
1 answer
355 views

Wifi Network-manager icon in green color Ubuntu 20.04

Ubuntu 20.04, does any of you knows why the icon tray is displayed as green? When this happen also the wifi stops working. I found this on the web but they trolled the poor guy. It only happens when I ...
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5 votes
0 answers
3k views

Unable to connect to scanner

This seems to be a reoccurring problem. There has been other questions similar to this without a decent answer. Ubuntu 20.04.1 locates the scanner when Document Scanner starts up but when told to ...
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  • 51
5 votes
2 answers
3k views

Qualcomm QCA6174 - Wifi Unstable - Dell XPS 13 9380 - Ubuntu 20.04 Focal

I have Ubuntu 20.04 installed on Dell XPS 13 9380 (Service Tag: 8SGZPV2) with Qualcomm QCA6174 wifi chip. Every 2-5 minutes, the wifi signal drops off then comes back online after a few seconds. This ...
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VPN: openconnect how to indicate a form field for authentication purposes?

I am trying to connect to a corporate vpn using openconnect (protocol Global Protect): perret at perret-pc in ~ $ openconnect --protocol=gp [vpn-address] POST [vpn-address]/ssl-vpn/prelogin.esp?tmp=...
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5 votes
1 answer
442 views

Openvpn connection problem using network manager

I have problem with connecting to vpn my company gave me those files along with a password I tried to import them this way 1- I go to Network Setting 2- then I press the plus button to add new ...
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5 votes
0 answers
9k views

Unstable wifi connection - "activation of network connection failed" Ubuntu 18.04

I have installed Ubuntu 18.04 on my HP laptop. LAN cable works fine, but WIFI connection is terrible. It might work sometimes but starts weakening too soon - starts "connecting" and eventually says "...
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5 votes
0 answers
7k views

DNS_PROBE_FINISHED_NO_INTERNET Ubuntu 16.04

When I connect to the router and navigate on Chrome I get this error: DNS_PROBE_FINISHED_NO_INTERNET I get the same even if I connect to another router in my area. I tried the command sudo -r ...
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5 votes
0 answers
1k views

tun0 doesn't have internet access

I'm using OpenVPN on tun0 (Ubuntu 16/EC2), I can successfully start it with systemctl start openvpn@Ireland (PIA's Irish cluster), but the interface doesn't have Internet access: curl --interface ...
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  • 150
5 votes
1 answer
2k views

Freeze on losing network connection

When I mount a server file system that is located in a local network over nfs on my laptop, the processes interacting with the filesystem freeze / hang up whenever the network connection is lost. The ...
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  • 299
5 votes
0 answers
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Wifi keeps disconnecting on HP 2000-2c10DX

My wifi keeps dropping connection constantly. I really want to use Ubuntu as a main OS, but this wifi problem is an issue. In the past, upgrading the kernel fixed it, but it isn't fixing the problem ...
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5 votes
1 answer
4k views

cat: /var/lib/misc/dnsmasq.leases: No such file or directory

I've searched all over the internet, but couldn't find any answers of my problem.. I want to connect my Raspberry Pi to my laptop. But whenever i try to check the ip address of my raspberry, i get ...
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5 votes
0 answers
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How do I force nmcli to reconnect to different uuid?

I have a bash script that checks my network environment and mounts shares accordingly. If I'm at work and have a hard-wire connection to the LAN, then I'd like to activate a hotspot connection for ...
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  • 331
5 votes
1 answer
3k views

Cannot change Wifi settings, stuck on WEP Security

I just started using Linux and as such do not have a proper knowledge of how to use the command line and all of those sorts of things, so please try to bear with me :). I have been able to connect to ...
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5 votes
1 answer
11k views

Openswan's ipsec verify fails on "Two or more interfaces found, checking IP forwarding"

I'm trying to set an L2TP/IPsec VPN. I have installed openswan from the repository on Ubuntu 13.04 Section: universe/net Architecture: amd64 Version: 1:2.6.38-1 and configured it following the ...
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5 votes
1 answer
5k views

Connected to wireless, but no internet access

After installing Ubuntu 12.04 a week ago wireless internet had been working fine. It stopped working yesterday, however, and I'm at a loss for what to do even after scouring replies to similar posted ...
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  • 121
5 votes
2 answers
5k views

Wireless not connecting automatically

My wireless is working fine, but when I login, it does not connect automatically, I have to select it from the list each and every time to use it. Even though the connect automatically option is ...
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  • 3,847
5 votes
0 answers
6k views

Playing Age of Empires II multiplayer in VirtualBox Over wi fi network

I installed Age of Empires II (Expansion) in VirtualBox (hosting Windows XP). It works great in single player mode. Unfortunately, I tried playing multiplayer via WI-FI which I created on my Ubuntu ...
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  • 5,904
5 votes
3 answers
5k views

Ubuntu 18.04: Two wireless interfaces

I just install Ubuntu 18.04 on my laptop. The laptop already has a wireless interface, when i try to plug in a USB wireless interface and try to turnoff one of them the other will stop too. And i can'...
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  • 51
5 votes
1 answer
2k views

How can I network two computers together using Thunderbolt 3?

I have two computers, and I need to transfer a (very) large file between them. Both computers are Thunderbolt 3 compatible, and I have a passive Thunderbolt cable ready to use. Is there a way I ...
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  • 33k
5 votes
1 answer
13k views

Bluetooth adapter not found in Ubuntu 16.04

Since my upgrade to 16.04 the OS does not find the bluetooth-adapter anymore. The Laptop is an Acer Aspire V5-573G and all i can find about the bluetooth adapter is this: "Bluetooth Qualcomm Atheros ...
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  • 208
4 votes
1 answer
343 views

Intel Wifi Periodically Stops Working on Ubuntu 22.04

Error: [42740.562956] iwlwifi 0000:00:14.3: Microcode SW error detected. Restarting 0x0. [42740.563042] iwlwifi 0000:00:14.3: Start IWL Error Log Dump: [42740.563047] iwlwifi 0000:00:14.3: Transport ...
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4 votes
1 answer
2k views

Ethernet is disabled after reboot - Ubuntu server 20.04.3

Problem I had a working internet connection over ethernet prior to shutting down, but now that I've booted back up I can't connect to my own network, let alone the internet. I had a very similar ...
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4 votes
1 answer
185 views

TPLink AX3000 not working with Ubuntu 20.04 (Failed to INIT ucode -110)

I'm running Ubuntu 20.04.03 with kernel 5.11. I have a Gigabyte B460M DS3H motherboard with a Core i5 CPU. I have installed a TPLink AX3000 Wifi 6 adapter that uses Intel's AX200 chipset. It is ...
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4 votes
1 answer
151 views

Why the internet is in use while nothing is running but Ubuntu OS?

I am using Ubuntu 18.04 and for some reasons installed it fresh yesterday , I found strange thing is happening while all my programs closed and even after turn on without open anything but system ...
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  • 431
4 votes
0 answers
247 views

why airplane mode turns on automatically?

I am using Ubuntu 20.10 on a fujitsu T901 laptop. Ubuntu automatically activates airplane mode and therefore wifi turns off and connection gets lost. there is no obvious pattern that I could ...
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