Questions tagged [connectivity]
The connectivity tag has no usage guidance.
66
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mutt hangs when connecting to SMTP server on an unreliable connection
When sending email with mutt and connecting to an external SMTP server, on an unreliable connection (e.g., bad Wifi), it often happens that mutt remains stuck at the "Connecting to..." stage ...
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36
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Intel AX210 with single antenna saw 5Ghz and then it didn't?
I've been upgrading an a bit older HP Pavillion laptop with SSD, more RAM and since I had one lying around, an Intel AX210 m2 wifi adapter.
The stock adapter was a single-channel Broadcom ...
- 224
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46
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Gnome shows ethernet connected when cable is unplugged
I'm trying to connect to the internet on my Debian 12 laptop using my phone connection through an USB-C cable.
When the cable is connected and the connection sharing is activated on the phone, the ...
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28
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Connecting 2 vm having ubuntu on same device
I have a window laptop where i have installed 2 ubuntu VM's on VMWARE workstation 17 player. I have downloaded apache on one Virtual machine and DNS on the other. I have a website on ubuntu having ...
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43
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Fallback to alternative jumphost address upon primary jumphost disconnection
I have a subset of servers that I can only reach via a jumphost connection, for which I have two independent addresses to utilize. Normally, this is straightforward and either of the two jumphosts can ...
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124
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Connection error: (Unable to connect to any servers, {127.0.0.1:9042: ConnectionRefusedError(111, Tried connecting to [(127.0.0.1, 9042)]
Sometimes when I try cqlsh command on my Ubuntu 22.04 machine I get the following error:
Connection error: (Unable to connect to any servers, {127.0.0.1:9042:
ConnectionRefusedError(111, Tried ...
- 158
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11
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How to simulate network error for DR testing using RHEL (compatible) hosts on local network?
I would like to simulate datacenter connectivity network error for DR testing. I have a local network with total of 6 hosts, simulating two datacenters with 3-3 hosts.
I would like to simulate the ...
- 236
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1k
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Ssh access to a server with internet access but no public IP address
I have an ssh server running Kubuntu 22.04 behind a router providing internet connection, but without a public IP (this is the policy of the ISP). So, the server can access the internet, but any port ...
- 4,861
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51
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How to update Ubuntu without network connection (using only connected Windows machine)
My ubuntu system no longer connects to the internet, I suspect due to lack of updates since I haven't used it for almost two years. However, I now need to use it with internet again, but it fails to ...
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1
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Ubuntu VM with bridged adapter not connecting to internet
I am trying to deploy a web app in a VM, but if I use a NAT adapter, that VM is assigned a private IP. I want to use the bridge adapter to give the VM a real IP in my DHCP network. Both host OS and ...
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Connection to github.com closed by remote host
Problem is exactly as reported in
HPC ssh "connection closed by remote host"
Connection to host closed by remote host. Exit status -1
But it is not the "ssh_exchange_identification:&...
- 1,354
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136
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Can SSH into headless setup, but no internet connection
I freshly set up a headless Raspberry Pi on Raspbian.
It is connected to the router via ethernet, I tried wifi before with the same issues.
I can SSH via ethernet and wifi, I can ping the Pi, from the ...
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194
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Turn a script do while to a systemctl service to intercept a tcp connection state
I made a little script that refresh browser, when web-server is down and connection is lost, with an infinite loop do/while true.
I want to turn it in a service for a better and clean solution.
The ...
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52
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Cannot connect to other instances within an AWS LAN
My client installed several AWS instances, all in the same region/datacenter.
My task is to install a Redis and a Postgresql instance on one of the machines and make the data store/database accessible ...
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1
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2k
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My Ubuntu 20 can't connect to internet despite the working wifi
My Ubuntu 20 cannot connect to any sites anymore. My wifi is working fine & the wifi connection icon on the top of my desktop shows that i'm connected, but i'm not!
I've checked to make sure I'm ...
- 121
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1k
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NordVPN on Arch Linux Limited Connectivity
I am using the NordVPN-bin package from AUR on my Arch Linux system (Manjaro KDE Plasma).
Connecting etc works just fine, but after I connected to the services I always get the notification: "...
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276
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networkmanager / nmcli - possible to ignore connection.secondaries for a single connection?
TL;DR - If you have your ethernet connection defined with "connection.secondaries" in networkmanager / nmcli (to auto-connect to a vpn), is there a way to skip / ignore / override the ...
- 651
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124
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My EPSON ET-2710 printer has a USB connection with a GNOME managed computer. I can print documents but Image Scan ignores my connection to the printer
My computer is a recent ACER Aspire with GNOME environment. I have connected it to my ET 2710 EPSON printer through a USB connection.
No problem to print a document. But the connection to the computer ...
7
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1
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3k
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How to make a systemd-timer depend on internet connectivity?
I'm using systemd-timer to periodically run a script which consumes a webservice.
Problem is, upon system resume or wake-up, internet connectivity would not get started right away but the timer gets ...
0
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1
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809
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list out all computer node connected to master node
I have HPC access, connected to other HPC via local IP or just simple hostname (i.e., compute1 or node3). I can log in to them by typing "ssh node3" or its IP like "ssh 10.2.6.20"
...
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1
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3k
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SSH connections frequently disconnected when using a mobile hotspot for internet access
My ssh sessions are frequently disconnected when I use a provider that offers internet service via cellphone towers. They seem to "freeze" and stop responding to anything I've typed, but ...
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239
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How to increase and check number of successful ssh connections to a remote host
I wrote the below loop that creates ssh connections to remotehost1
$ cat sshloop.sh
#!/bin/sh
i=0
while [ $i -ne 500 ]
do
i=$(($i+1))
echo "SSH COUNT IS: $i"
...
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A ping script to check network availability
I want to create a script for ddwrt that pings on 4 hosts to check whether internet is available or not. If out of 4 tests, one of the ping results comes true then assume internet is working otherwise ...
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2
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374
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Why is OpenVPN Client Failing to Connect on Linux?
This VPN works fine in Windows however trying to start it in CentOS works for a few seconds and eventually stops with no message in error logs. Also the server instantly stops responding to pings ...
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1
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1k
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Bluetooth cannot connect to BT Keyboard
I recently invested in a new Intel NUC and put Arch Linux on it. I also invested in a Keychron K6 however I have hit a brick wall when it comes to connecting to it via Bluetooth.
Here is what ...
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102
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Connect to wifi w/out DE and DM
When installing LAMP server, I went for tasksel, and got my DE (Xfce) and seemingly also display manager (LightDM) removed (this is a known "bug", believe it or not). Now I just need to ...
- 226
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106
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Make NetworkManager connect to the preferred network when it becomes available
I have a Debian Linux server and two wireless networks, A and B.
Network A is the preferred, faster network. B serves as backup.
Therefore I have set both to connect automatically in NetworkManager ...
- 739
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1
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Testing connectivity and port availability using SSH instead of Telnet
Assume that you have a pair of UNIX/Linux machines. You want to check if both machines can connect to each other via an arbitrary port, say, TCP 111.
Log into the shell of Machine 1 (10.0.0.1). If ...
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344
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Emulating temporary loss of internet connectivity programmatically
Is it possible to make a program lose and get back it's internet connection by some other means than disconnecting/connecting the cable or putting the interface down/up?
That would be necessary in ...
- 305
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1
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372
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Ethernet connection unmanaged
I am using elementaryOS 5.1.7 Hera and I suddenly don't have any ethernet connection. Network manager says it's unmanaged. I checked that /etc/NetworkManager/NetworkManager.conf has indeed managed=...
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49
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Establish LTE-internet connectivity
I am trying to establish internet connectivity using a SIM card.
Running the command nmcli radio shows WWAN to be enabled, however the command:
nmcli device status
returns:
DEVICE TYPE STATE ...
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1k
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How can I test GRE packets connectivity?
If desiring to test TCP port 5900 to a remote host (say IP 111.222.111.222 ), I do :
l$ nc -v 111.222.111.222 5901
Connection to localhost 5901 port [tcp/*] succeeded!
RFB 003.008
As can be seen, ...
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671
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Intermittent internet connection/DNS issues with Debian
For the last 15~20 days I've faced a inconsistent connection issues. I've tried several things, and mostly I can't say if they helped or not.
What I can say for sure:
When returning from hibernation, ...
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1k
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Bluetooth keeps changing from A2dp to headset and loses connection on Debian Buster with JBL 4 Speaker
since over a year I am having trouble with the bluetooth connection to my JBL 4 speaker. It looses connection again and again. I created a script according to what I found on the internet to reconnect ...
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Bizarre connectivity issue
I just got the most bizarre connectivity issue.
WiFi connects and also cable. I can ping and even connect to a VPM (forticlient), but the browser can't reach any page. It throws "server not found" ...
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Interernet is not available in Browser
I am using Linux Mint 19.1. I am getting internet in Laptop but I am not getting internet in Browser.
My laptop suddenly shut down after that I am not getting internet in my Browser.
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281
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Make ssh client process end once the connection to server was lost!
I have a ssh process hanging around (i.e., does not exit and end).
I can test that no connection with the sshd server exists anymore
ss -t | grep [SERVERIP]
yields no results. Additionally, being ...
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236
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Connect docker-container with other container by unit-socket
I'am trying to connect to containers by unit-socket/
docker run -d -v /var/lib/docker/overlay/[container_id]/var/run/postgresql/.s.PGSQL.5432:/socket_volume/.s.PGSQL.5432 -p 50000:8080 my_repo/...
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ssh session for Azure CentOS virtual machine keeps getting disconnected after only few seconds of inactivity
ssh session with PuTTY to an Azure CentOS virtual machine keeps getting disconnected after only few seconds of inactivity.
Also i am running a self developed process that gets killed for no reason .. ...
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281
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How to configure stderr from nc?
I would like to check port connections with nc and forward the result to a text file.
stdout works fine. stderr is empty, if you don't use -v (which I dont want), so I would like to configure the ...
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No Link on WAN Port for TP-Link Archer C7 AC1750 v4 Running OpenWRT 18.06.4
Looking to upgrade from a working Linksys router running OpenWRT Kamikaze, I selected the TP-Link Archer C7 based on happy Reddit reviews of OpenWRT running smoothly on it. It seemed lucky to get the ...
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how do I tab in telnet when executing it on remote host by ssh?
How can I use tab when I use telnet on a remote host by ssh, I have something like:
ssh -o StritHopstKeyChecking=no -p port user@hostA telnet hostB; echo "Reconnect?"; while read < /dev/tty; do ...
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(Ubuntu 18.04 LTS) Can't switch off Airplane mode with physical switch
I'm running Ubuntu 18.04 LTS on an MSI GS65 Stealth 8RE. When the laptop gets out of sleep mode, air plane mode is on and Linux says it must be deactivated via a physical switch. The FN+F10 ...
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1
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Can't connect to Github from one PC, every other website works fine
Running Ubuntu 16.04, I can connect to other websites fine:
ping google.com
PING google.com (172.217.25.206) 56(84) bytes of data.
64 bytes from nrt12s13-in-f14.1e100.net (172.217.25.206): icmp_seq=1 ...
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1
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USB-Ethernet adapter stops working periodically, as if going to sleep
My laptop uses a USB-Ethernet adapter for a wired connection. Periodically, while actively working, the connection is lost. NetworkManager tries to connect and to obtain an IP address via DHCP but ...
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Unable to telnet to a server
Here are 2 servers
192.168.0.12
192.168.0.21
there is a service running in 50070 port in server 192.168.0.12
when I do telnet from 192.168.0.21 server it fails:
$telnet 192.168.0.12 50070
Trying ...
- 113
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Mac Unable to Connect to a Wifi Hotspot - Google Starbucks
I have a MacBook Pro that is not connecting to a Wifi Hotspot - namely, Google Starbucks.
The problem is that the login page will not pop up when I connect to the network as it does with every other ...
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546
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get pppd exit code - how?
I'm designing some reporting system on Raspberry Pi system which connects to world thru 3G usb modem controlled by pppd.
99,999% of time connection works ok, but sometimes it drops and further ...
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Change USB Port Health (Connectivity) Check Interval
Is there any way (in Linux) to change the interval that the system polls the USB ports for a health (connectivity) check? Or even turn off this check?
Background: I have a small box that the devices ...
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584
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Hadoop cluster not listening on port that I configured. What is wrong?
I set up a Hadoop cluster with RHEL 7.4 servers. There is no firewall between them. I am running Hadoop 3.0. On the namenode the core-site.xml file is configured to use port 54310.
I run this ...
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