Questions tagged [networking]

Managing and using network connectivity on a Ubuntu system

9,648 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
9
votes
0answers
2k views

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 ...
8
votes
0answers
1k views

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=...
8
votes
0answers
10k views

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://...
7
votes
0answers
780 views

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 ...
7
votes
1answer
571 views

Sysctl IPv6 disable autoconfig for all interfaces not working

I am trying to turn off IPv6 autoconfig for my all interfaces (I have 4). I want to use net.ipv6.conf.all.autoconf = 0 In the my sysctl config (under /etc/sysct.d) But the settings not applied for ...
7
votes
0answers
454 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 ...
7
votes
0answers
731 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 ...
7
votes
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
votes
1answer
289 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
votes
4answers
998 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
votes
0answers
932 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 ...
6
votes
1answer
336 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 ...
6
votes
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 ...
6
votes
1answer
16k views

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://...
6
votes
2answers
675 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 ...
6
votes
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
votes
0answers
10k 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", it always show "connection establish successful" and then show "Network connection failed :unknown reason:" right now, I find ...
6
votes
1answer
792 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
votes
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
votes
0answers
900 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
votes
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
votes
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
votes
1answer
299 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 ...
5
votes
0answers
3k 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
votes
0answers
6k 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?
5
votes
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 ...
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
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 ...
5
votes
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 ...
5
votes
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 ...
5
votes
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
votes
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 ...
5
votes
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
votes
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
votes
1answer
21k 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
votes
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
10k 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
votes
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
votes
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
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
votes
2answers
488 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
votes
0answers
517 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 ...
4
votes
0answers
53 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 ...
4
votes
1answer
8k views

Ubuntu 20.04 “Temporary failure in name resolution” - recently reinstalled

I rent a vps from contabo for about half a year now, it worked fine until now, because it started producing "Temporary failure in name resolution" errors. I read that this is a DNS error, I tried ...
4
votes
1answer
1k views

KDE CONNECT issue on KUBUNTU 20.04

After upgrade to Kubuntu Focal Fossa, this app doesn't find my phone. My topic is also related to these: Connection problem with KDE Connect KDE Connect - Main phone and Desktop cant see each other -...
4
votes
0answers
995 views

Ubuntu 20.04 VPN PPTP doesn't work

syslog error: May 8 09:54:21 pptpteste-VirtualBox pppd[2367]: LCP: timeout sending Config-Requests May 8 09:54:21 pptpteste-VirtualBox NetworkManager[2367]: LCP: timeout sending Config-Requests May 8 ...
4
votes
2answers
172 views

IP command using to 100% CPU on wakeup

On laptop wakeup I see a process called ip that uses 100% CPU. It won't stop on its own, I need to manually kill it every time. By looking for it in ps I could find that the command being run is ip ...
4
votes
0answers
324 views

How to resolve acer_wmi errors filling up kern.log and syslog?

Recently bought an Acer Predator Helios 300 and was able to create a working Ubuntu 18.04 and Windows dual boot setup in my third attempt. I really have my doubts whether all the modules have ...
4
votes
0answers
637 views

19.10 dhclient + resolvconf not updating resolv.conf

I am not running systemd.resolved, not do I wish to. Am am using netplan, systemd.networkd, resolvconf, dhclient /etc/resolv.conf is a link -> ../run/resolvconf/resolv.conf The resolvconf hook from ...

1
2 3 4 5
193