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Questions tagged [connection]

A connection generally refers to a TCP/IP connection, that is established as the result of the handshake between 2 hosts.

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28 views

Monitor outbound connections

How I can monitor outbound connection that are made from my server along with the program/application which has made the connection request? I have tried using the below command and I am not much ...
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1answer
56 views

GCP Instance Connection Disruption

I am a novice GCP user trying to run 4 scripts in parallel on an a linux instance with 4 CPUs, 4 GPUs, 15 GB RAM, and 30 GB Disk space. However, a few minutes after initializing my scripts, both ...
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Is it possible to watch the tcp connection packets on a connect call from the command line in linux?

Basically I want to do something like strace ssh user@host and instead of seeing the system calls, I want to watch the tcp connection packets as the connection is established. I'm having this weird ...
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40 views

I cannot get two VMs to communicate on the same network

Good morning, Prerequisites: All VMs are stored on Power8 servers. (10.45.0.0/16) (255.255.0.0) 10.45.0.100 VM1 10.45.0.40 ES 10.45.0.101 VM2 10.45.0.102 VM3 I performed all the tests using ...
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Why does my REST server response time increase when I have more connections

A trivial example shows that latency of responses grows rapidly with open connections. I don't understand why this is. How can I address this issue? For example: var express = require('express'); ...
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72 views

How to add RAS / EAP Credentials in Windows, in non-interactive, batch mode?

I want to make a fully automatic VPN client that does not require to enter a password through Windows GUI. The server to which VPN will connect is configured as IPSec IKEv2 VPN with EAP-MSCHAPv2 ...
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35 views

Establish VPN connection from a client behind a Debian router

EDIT : My searches leaded me to GRE packets : they seem to be exchanged on IP port (not TCP one) 47. It seems to be quite painful to handle it with iptables. So question become : how can I transmit ...
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1answer
64 views

Can't connect to my google cloud server via RDP

I have a google cloud server, I've been using it for months and I always connect to it by downloading the RDP file and it always worked. But today I'm getting this error message when I try to connect....
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1answer
49 views

Having issues opening up a port for my instance on GCE

I'm running a GCE instance. I ran sudo ufw allow http && nc -l 80 and it succeeds, showing that 80 is open. However, when I try to open up a server by running waitress, a Python server, with ...
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21 views

lsof displays two connections from one port

I'm following lsof output for my process COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME AppName 79899 heximal 7u IPv4 0x6c18d5501d2e17c9 0t0 TCP 10.3.2.8:...
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22 views

Connection timout between two IP troubleshooting

I have a client with a webserver and a VPS server with a webserver and a mailserver. These machines have to exchange data via REST API but I have a problem, they are not reachable each other over HTTP ...
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2answers
167 views

Webmail via imap unix socket - good idea or not?

I'm slowly setting up an email system on a Centos 7 server. The particular software I'm using will consist of postfix, dovecot and roundcube, although my question isn't specific to them (I think). I'...
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65 views

Nginx dynamically limit bandwidth per IP

I'm trying to set up a Nginx web server for serving file downloads. Let's say that my server has the capability to upload at maximum 1Gbps, is there any way I could make Nginx spread the bandwidth ...
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0answers
142 views

Logstash losing connection to Elasticsearch nodes

We're running Logstash on a server which is pushing logs into an Elasticsearch cluster. In the Logstash logs we see it losing connection to the Elasticsearch servers with a connection reset error. We ...
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1answer
103 views

PostgreSQL trust connection with QGIS

I've setup a local postgresql database, and as it's a local database, I'm not worried about security or authentication. I'm currently using this database with QGis and PostGIS to store geometry data. ...
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1answer
23 views

How can I count the time spent in a day in establishing connections between two servers?

I have two servers, one is a SQL Server and the other one is a webserver with IIS installed. I'd need to find a -weird, admittedly- information: how much time the webserver spend during a day, in ...
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1answer
40 views

nameserver doesn't work stable

I've recently bought 2 domains from namesilo. I'm using a VPS on AWS. https://duman.digital and https://dumandigital.com Both are using the same nameservers, same settings, however dumandigital.com ...
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145 views

503 Service Temporarily Unavailable AWS

I followed this tutorial https://medium.com/@remy.dewolf/aws-fargate-first-hands-on-experience-and-review-1b52fca2148e but in the end when I copy-paste the DNS name I get that the service is ...
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2answers
1k views

Cannot establish VPN connection in Azure

Today started to get this message: The connection was prevented because of a policy configured on your RAS/VPN server. Specifically, the authentication method used by the server to verify your ...
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1answer
36 views

Windows Server 2011 - System opening ominous TCP connections

Where I work we have a Windows Server 2011 Small Business edition, and recently our Symantec software started reporting "blocked intrusion attempts" from port 80. Our routers do not forward any port ...
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2answers
500 views

After Windows 10 update 1803, network fails randomly

We have a network with 4 servers and several clients with W10. The server's OS versions are: W10 Enterprise: 10.0.17134.137 W10 Pro: 10.0.17134.165 W10 Enterprise: 10.0.17134.165 W10 Pro: 10.0....
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52 views

how to get file download connections on linux

I have a site with video content (mp4 files). When people are watching videos, they are downloading video files from my site. I want to know the number of the active connections via the linux ...
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1answer
91 views

Nginx shows 15k active connections, few are reading/writing/waiting - what are they doing?

Currently using NGINX as a load balancer for an upstream to a sharded mongo cluster. .conf reads: stream { upstream prodapp_mongo { least_conn; server xxx.xxx.xxx.xxx:27017; ...
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1answer
26 views

I get a ERR_CONNECTION_TIMED_OUT for the web and cant connect via SSH to a server

Was in the middle of working on a website on a linode server when suddenly it went offline. Trying to connect via the web I get: This site can’t be reached xxxxx.com took too long to respond. ...
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250 views

Connecting to MongoDB Atlas throws Exception 'No suitable servers found'

Connecting to the mongodb atlas and trying to write a simple document gives the following error. What am I doing wrong? $manager = new MongoDB\Driver\Manager("mongodb://admin:admin@test-shard-00-00-...
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1answer
515 views

cassandra port is closed

I am trying to connect to a cassandra installation from a remote machine. Cassandra is running the thrift service on 9160 which is the default port. But I cannot connect the DB and I always get ...
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1answer
45 views

Trouble connecting to a remote server using SSH

I am able to connect to git@github.com using ssh. My key matches the key stored in the server. However I am trying to connect to a private repo git@privaterepo.com that blocks non allowed IPs and I ...
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17 views

Lost requests between linux servers (¿SSL maybe?)

I'm having a headache with that: I've two landing pages in 2 different domains in a "Server A". One landing page with HTTPS and another one without it. Both landing pages have a file named "tracker....
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26 views

Debugging connectivity issue to a website

How can we debug the connectivity issues to a website https://test.mysite.office.net? From public networks, this URL is accessible. From our network we are not able to access it. But Ping works fine, ...
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103 views

I can ping only some websites. At my wits end

I have a really strage phenomenon in one of our data centers. I can ping facebook.com, yahoo.com, deb.nodesource.com and a few others (DNS resolution works fine). But I can't ping google.com, archive....
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407 views

Tomcat not accepting connections, Apache using up all available workers

We run two separate tomcat-servers (tomcat 7) behind a load-balancer and an Apache (v. 2.2) working as proxy (on the same host). Every server runs about 70 microservices which are accessed from a ...
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2answers
89 views

Verify network providers

The hosting company is telling us that their network is multi-homed, a blend of multiple bandwidth providers (level3, att, cogent...) Is there any way we can test / verify their claim? we want to ...
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1answer
103 views

HAProxy-Apache encrypt connection

I have haproxy_server and apache_server in different datacenters, what is the best way to have encrypt connection between them? It’s working with the certbotand with the following configuration: ...
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1answer
42 views

How to connect to my desktop from Linux debian Azure VM,

I have a license server on a local desktop computer in my office; I should be able to connect to it thanks to its ip-adress and port. But it does not work. To understand why, I tried running command: ...
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1answer
405 views

RST packet and server behavior

If a client send one RST packet to a server, how will the server react? Client ----RST----> Server Does the server close the connexion immediatly or does it wait for another packet to be received? ...
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1answer
37 views

Internet host is not accessible with VPN connected

I've connected to my work VPN via KerioControl VPN Client. Everything was OK until today I've experienced connectivity issue with internet host: ping api.nuget.org Pinging cs9.wpc.v0cdn.net [72.21....
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2answers
545 views

telnet non interactive: connection closed by foreign host

if I do telnet host_ip port < /dev/null Trying host_ip... Connected to host_ip. Escape character is '^]'. Connection closed by foreign host. By checking the wireshark, the client side sends tcp ...
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1answer
64 views

Connect 3 L2 switches to router

I own: 3 switches (layer 2, managed, 24 ports) model Zyxel GS1920-24HP 1 router model Zyxel USG 310 My network is segmented into 10 VLANs (1, 2, 3, 4, 5, 6, 7, 8, 10, 11), the central router ...
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1answer
192 views

iptables block traffic on 443 port without connection timeout

I have a pc 192.168.1.10 and I want to block traffic to port 443 from the lan to it. Now I am just using: iptables -A INPUT -p tcp -s 192.168.1.0/24 --dport 443 -j REJECT the problem is that if I ...
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0answers
2k views

AWS: ssh_exchange_identification: read: Connection reset by peer

I am facing "ssh_exchange_identification: read: Connection reset by peer" error. I am not able to ssh my instance. Any help is highly appreciated. Thank you. Below is the debug information ssh -i ~/....
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2answers
473 views

random CONNECTION_RESET on apache2.4 debian 9

My server has some strange behaviour and I just cant find the cause. I've been looking everywhere. I will pay 200$ worth of bitcoin to anyone who can figure this out. The problem: When requesting ...
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1answer
93 views

weird netstat output on netscaler

We have a VPX-1000 netscaler. When traffic suddenly increases our website goes offline and doesn't response to requests but our netscaler load is fine (cpu %40 ram %50 4 cores 4gb). After incident ...
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1answer
61 views

Random connection resets between browser and Linux server - MTU wrong or ICMP not getting through?

I've been seeing random ERR_CONNECTION_RESET errors in my browser (Chrome, Firefox or Edge running on different machines, Windows 10 1709) when I try to edit web pages on a remote Linux server running ...
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1answer
175 views

Unable to SSH/Ping but can FTP/Connect to Apache [closed]

I've gone away for a couple of days and left my machine running at home. I was doing some stuff on it over ssh just before I left and it was working fine. I got to the hotel and connected to the wifi, ...
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0answers
779 views

SSH server connects, but does not open a shell session

I have a server, where I can login using SSH, but do not get a shell (anymore). What can I do to login to a minimal shell to debug the issue? Here is the log of ssh -vvvv debug1: ...
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0answers
770 views

HTTP request works on browser, fails on everything else

What am I doing Two NodeJS/HTTP servers running on ports 3000 and 3001 Using Nginx to proxy requests app.localhost -> localhost:3001 api.app.localhost -> localhost:3000 What's wrong ...
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3answers
98 views

Loss of connection when connected via switch

we've currently set up 7 ubuntu machines connected to a switch and that switch to a router-modem, router has dchp configured to bind each machines specific Mac address to an ip (in essence static IP ...
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2answers
600 views

DHCP server problems with static IP clients

lately I've been having some problems with my DHCP and my clients IP. So basically, in my netwrok I have a DHCP server (Windows 2012 R2) which is working fine (when you connect to the network you get ...
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0answers
715 views

Debian 8 - TCP Overflows / TCP Drops

I have recently installed netdata on my Debian 8 server (monitoring software) and afetr installing my Debian 8 server is reporting the below two alerts constantly. 1m ipv4 tcp listen overflows = 37 ...
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0answers
60 views

Parts of Synology down or a local issue?

I have a Synology NAS DS214+ appliance, which lately has started working wierdly. I started looking into this, after seeing problem with Synology Package Center, same as in this question: Impossible ...