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

Has anyone had the same problem? 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 ...
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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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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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What are the use cases for cloud-init?

Installing Ubuntu Server 18.04, I see the networking config in /etc/netplan has a .yml file that talks about CloudInit and networking configuration not persisting across instances. I have read https://...
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0answers
988 views

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 ...
7
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2answers
755 views

Is there a way to prevent USB over ethernet from working?

This video shows an attack where attaching a USB device to a locked computer pretty much takes over all currently running browsers. The trick is that the USB device acts as Ethernet over USB, and a ...
7
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0answers
740 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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0answers
6k views

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. ...
7
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1answer
290 views

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 ...
7
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1answer
11k views

How to see log of nmcli “Network connection failed :unknown reason”

My country has network block, so when i use "nmcli connection up uuid <UUID>", it always show "Connection establish successful" and then show "Network connection failed :...
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4answers
1k views

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 ...
6
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1answer
359 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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0answers
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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0answers
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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?
6
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1answer
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16.04 - curl: (35) gnutls_handshake() failed: Error in the pull function

When trying to connect to a HTTPS websites, I get this error curl: (35) gnutls_handshake() failed: Error in the pull function.. In detail: curl -vvv "https://example.tld" * Rebuilt URL to: https://...
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0answers
1k views

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/...
6
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1answer
4k views

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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0answers
4k views

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 ...
6
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3answers
32k 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,...
6
votes
1answer
816 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-...
6
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2answers
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 ...
6
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0answers
915 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 ...
6
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1answer
4k views

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 ...
5
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2answers
2k 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 ...
5
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0answers
563 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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0answers
1k views

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=...
5
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1answer
338 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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0answers
4k 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 ...
5
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1answer
3k views

Opening a port to an application accessible outside of localhost?

Though I have researched this all day, I still can not find a solution to this issue. On my Ubuntu Server I am trying to run a node.js application that simply prints out "Hello World" and runs on ...
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0answers
6k 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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0answers
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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0answers
2k views

Why Speed and duplex Unknown!?

I'am add Network card (OneConnect 10Gb) on ubuntu 16.04 and show ethtool command but output show speed and duplex unknown!. any idea fix this problem. xxx:~# ethtool enp12s0f0 Settings for ...
5
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1answer
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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0answers
2k views

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 ...
5
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1answer
3k 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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0answers
1k views

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 ...
5
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0answers
1k views

open file on network using bookmark for Keepass2

On my network I have a file named : sftp://bernard@myserver.nl/home/bernard/shared/keepass2/algemeen.kdbx I want to use this file with Keepass2 In Nautilus I have mounted the directory successful and ...
5
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1answer
22k 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 ...
5
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1answer
2k 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 ...
5
votes
1answer
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 ...
5
votes
1answer
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 ...
5
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2answers
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 ...
5
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0answers
5k 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 ...
5
votes
1answer
1k 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 ...
5
votes
1answer
12k 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 ...
4
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0answers
171 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 ...
4
votes
1answer
1k views

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 ...
4
votes
2answers
556 views

WIFI keeps disconnecting every half an hour

I have a Lenovo thinkpad with intel wireless: Cannon Point-LP CNVi [Wireless-AC] 9560. It worked great until I upgraded from Ubuntu 18.04 to 20.04. Ever since it disconnects from the internet every ...
4
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0answers
55 views

A strange path is being printed for an entry when netstat command is used?

When I used the netstat -a command to check for active connections, I encountered this entry under active unix domains sockets(servers and established) Proto Refcnt Flags Type State ...

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