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Questions tagged [connectivity]

63 questions
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1 answer

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 fired and hence the script returns error (If the…
Zeta.Investigator
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1 answer

How to create a configuration to only connect to WiFi if signal is ≥ 30 %?

Is there any chance to create a configuration that does the following job? Only connect to available WiFi if it's signal is stronger than 30 % At many places, I stay in the border area of barely available wifi-signals. Thereupon those inevitable…
Dave
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4
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1 answer

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 each attempt fails. The connectivity lights on the…
BugBuddy
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4
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1 answer

Broadcom BCM4352 : Bluetooth does not connect

Why does Blutooth not connect? The Bluetooth unit can find, but not connect to other devices on Debian Testing (9.0 Stretch). Bluetooth works well with a different Operating System. BIOS settings permit wireless. The following packages were…
user75798
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4
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0 answers

Cannot connect to FreeBSD server behind a router

I have a FreeBSD 9.3 installation inside the 192.168.2.x LAN2 which is connected to the 192.168.1.x LAN1 (router WAN IP is 192.168.1.10). This BSD runs SSH and FTP services. I can use both services from any LAN2 computer. But I am unable to connect…
lpVoid
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3
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1 answer

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 sometimes don't give an actual disconnect message until…
TiredSquirrel
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3
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Telnet connect to non-existing adress

I'm having unexpected behavior using the telnet command on various linux (Linux Mint, Ubuntu server). When trying to connect to a non-existent device, it succeed. I tested with 1.2.3.4 which is not a placeholder. Telnet $ telnet 1.2.3.4 9100 Trying…
Édouard Lopez
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2
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2 answers

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:" error, i.e., it's different than the ssh server: reasons for…
xpt
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2
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1 answer

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 Telnet is installed on it, you can check the…
Culip
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1 answer

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 ssh -o StritHopstKeyChecking=no -p port user@hostA…
stdcerr
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2
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5 answers

(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 combination to turn it off works on Windows, but doesn't on…
deque
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1 answer

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 ttl=54 time=42.6 ms ping yahoo.com PING…
Omegastick
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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 command: hdfs dfsadmin -report But I get this error…
Jermoe
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The command "hdfs dfsadmin -report" fails because "failed to connect to server"

I am trying to configure a multi-node cluster of open source Hadoop. I have Hadoop 3.0 installed on the namenode and the data node. Both are running Linux (SUSE and Ubuntu). None are CentOS, RedHat or Fedora. I have tried different settings with…
Jermoe
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1 answer

Certain HTTPS web sites do not load from KVM virtual machine over IPv6

This is driving me crazy as I cannot load certain HTTPS web sites only from KVM virtual machines and only over IPv6. IPv4 works fine. IPv6 connectivity works for the same websites from the hypervisor. My setup The KVM hypervisor is running on…
Vangelis Tasoulas
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