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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Windows Server Hyper-V host Ubuntu guest network down until restart after incident

I have a Windows Server 2022 host with Hyper-V installed. There are two Generation 2 VM's installed, Ubuntu 20.04 and 22.04 LTS servers. Host machine has a network configuration that looks like this: ...
-1 votes
2 answers
2k views

Nginx yielding 499 status due to upstream connection reset

Have read other posts; they do not yield much light. Situation: Kubernetes cluster with ingress points to Several nginx containers that proxy-pass to a Node application on a specific URI via location ...
2 votes
1 answer
10k views

Weblogic JDBC connection pool keeps in suspended state when DB is back to normal

We have a JDBC connection pool on a weblogic 12c. When the backend database goes to offline, the pool goes into suspended state, and when the db is back online after a short period of time (say 5 min),...
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0 answers
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SSH_CLIENT variable bringing the server's IP instead of the client's IP when connecting via SSH

I need to monitor the SSH access logs of an Oracle Linux Server 7.9 to determine which machines accessed this server throughout the day. However, the logs display the IP of the server itself instead ...
-1 votes
1 answer
105 views

Cannot connect to server using some applications

I've been using ssh to connect to my server for weeks, but 24h ago it suddenly stopped working. The following things I tried: When I enable VPN on my local machine I can connect When using my phone's ...
83 votes
16 answers
685k views

What causes SSH error: kex_exchange_identification: Connection closed by remote host?

I setup a SSH server online that is publicly accessible by anyone. Therefore, I get a lot of connections from IPs all over the world. Weirdly, none actually try to authenticate to open a session. I ...
0 votes
1 answer
3k views

FireFox gets ns_error_net_interrupt when clicking on loaded page

FireFox is connecting to my website, but accessing already visited pages would randomly not connect resulting in a Secure Connection Failed Chrome and Microsoft Edge are not having that problem. ...
3 votes
1 answer
985 views

smbcacls fails with NT_STATUS_BAD_NETWORK_NAME while smbclient connects

smbclient works fine: $ smbclient //server1/share1/ -E -W AA -U username%password Domain=[AA] OS=[Windows Server 2008 R2 Enterprise 7601 Service Pack 1] Server=[Windows Server 2008 R2 Enterprise 6.1] ...
1 vote
1 answer
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How can I do site-to-site OpenVPN routing without NAT

I have two OpenVPN servers at different location. Each machine in one location can ping and connect to every machine in the other location. My problem is when I use SSH to connect from machine A in ...
0 votes
1 answer
48 views

Mail server woes

A problem has cropped up on my network today and I'm rather confused. Firstly here's the setup of my network.... Internet traffic comes in via static ip. Ubiquiti Dream Machine Pro forwards mail ...
0 votes
2 answers
641 views

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 ...
0 votes
2 answers
973 views

postfix time to time issue delivery temporarily suspended connection timed out

I have a Postfix installed on an Oracle Linux server. This Postfix is configured to receive emails from another Postfix server, which are sent externally through the Fortinet Cloud Email Security ...
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0 answers
666 views

Kubernetes connection refuses often

I have configured Kubernetes using kubeadm in cent os stream 9. When I issue kubectl commands i am getting this error often The connection to the server xx.xxx.xx.xx:6443 was refused - did you ...
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0 answers
362 views

How to get actual latency when downloading with curl?

I have an http software that let people be logged and download data according to sent bytes. It's an infinite download until connection stopped. I want to know the time for each download. The ...
0 votes
1 answer
92 views

When connecting to my server through my domain, I get connection error. however, on a VPN it connects just fine [closed]

New poster here so unsure if this is the correct stack exchange. But basically, I use NPM (Nginx Proxy Manager) to direct internet traffic to various VMs running on my hub server running proxmox. ...
0 votes
0 answers
25 views

Connected Host / Hypervisor does not show up in network, but hosted VMs do

I have setup a Debian based hypervisor with a single Ethernet Device, such that /etc/network/interfaces looks like that: allow-hotplug eth0 iface eth0 inet manual auto iface eth0.30 iface eth0.30 ...
1 vote
2 answers
562 views

Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your Internet connection or proxy settings

I have recently (past 24 hours) noticed the above message when logging into a headless server over WAN via ssh. When I try to apt-get update the server, I get "Failed to fetch ... Temporary ...
0 votes
0 answers
413 views

How can I check if an outgoing connection is blocked by local firewall?

I have a situation, where my server can't connect to an SMTP server, while my PC can. But the same server can connect to another SMTP server. I think that my firewall might be blocking it. How can I ...
2 votes
1 answer
4k views

Drop ALL the TCP connections (ESTABLISHED,RELATED) in Ubuntu

I'm facing a few hosts sending a flood of requests to my webserver (NGINX). I'm trying to block them via iptables, with ipset and a good old DROP rule. The rule is effective against NEW connections, ...
0 votes
0 answers
173 views

Intermittent Inbound Traffic Blocked Windows Server 2012 R2

We manage a number of pcs running Windows Server 2012 R2 on various hardware (computers have differing network cards etc.). These machines are connected at different physical locations to a physical ...
6 votes
2 answers
51k views

Why would a client send a RST packet as reply to a SYN,ACK?

I have a HTTP webservice where sometimes the connection setup fails in a strange way: client sends a SYN packet server sends a SYN,ACK reply client responds with RST In which situations could a ...
1 vote
2 answers
15k views

Can't connect to nginx server from public IP Address

Hi I have a nginx server running on a linux machine. I can connect it to from localhost using curl -v http://localhost:8080 fine. But can't connect it to using curl -v http://<machine-ip>:8080, ...
3 votes
2 answers
697 views

Errors about Making Failover-Cluster on Hyper-V with Win-Server-19 on Powershell

Good day. On my working have task to make Cluster incide cluster on Hyper-V. Started to do this. Made 3 virtual PC on Hyper-V, download Failovering cluster by command:"Install-WindowsFeature ...
0 votes
0 answers
498 views

HTTP request fails with connection time out, but only from our server

My web application is running on a dedicated linux server located at a major hosting company. It needs to connect to an API provider, but libCurl always reports a connection timeout. I've boiled it ...
0 votes
1 answer
786 views

Jenkins Plugins Error After Update - "Errors Checking Update Site"

I'm running Jenkins on a RHEL 7.9 server, with OpenJDK 11.0.17. I recently updated Jenkins to version 2.361.4 from 2.346.3. After updating I went to the plugins manager page to see what plugins ...
1 vote
1 answer
2k views

Can no longer connect to server (an error occurred during the pre-login handshake)

Apologies if this isn't the place to ask this, or if it isn't enough information to go off of. I'm pretty new at this and don't know what or where else to ask. Since two nights ago, nobody can connect ...
19 votes
14 answers
269k views

SQL - an error occurred during the pre-login handshake

Until yesterday evening, I was able to connect to my server from my local machine. Now, I get the following error: A connection was successfully established with the server, but then an error ...
0 votes
2 answers
658 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. ...
1 vote
0 answers
818 views

Intermittent RDP disconnects

We have a Windows Server 2016 VPS which we use to run company software on it. Users have to RDP to it, each one of them has its own separate session. At one of our sites, we have poor 4G internet ...
1 vote
1 answer
2k views

Which machine is actually closing the TCP socket and why?

I'm working on a C# application, handling TCP sockets. I have a server application (Hercules) on the remote machine, trying to keep a socket open. I have my application on my machine, subscribing to ...
0 votes
0 answers
68 views

Why does connectivity differ for straight and crossover cabling towards 1Gbit MDI-X capable switch (from Linux OS)?

There's no constraint with directly connecting a Realtek 1000/100/10Mbit transceiver towards a common router. There was no connection ('Could not activate connection: Connection 'Name of Lan ...
0 votes
2 answers
3k views

ec2 instance connection timed out but can be pinged

I've seen many similar questions but none like this. So I started an ec2 instance and installed apache, Wordpress, etc on top. And I was able to access everything fine with the public IP provided to ...
0 votes
2 answers
3k views

HAProxy Maintain Connections to Backend regardless of Frontend Connections

Is there a way to configure HAProxy to maintain an X number of open HTTP connections to the backend that get reused by new HTTPS connections (i.e. requests) to the frontend, and keep the backend ...
0 votes
1 answer
2k views

"MySQL Server has gone away" on simple select

I get a MySQL server has gone away error on a simple query. mysql> select version(); ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 1 A ...
71 votes
7 answers
140k views

How to force MySQL to connect by TCP instead of a Unix socket?

I would like to analyze mysql traffic. Right now, all mysql requests are sent to the MySQL unix socket: unix 2 [ ACC ] STREAM LISTENING 3734388 15304/mysqld /var/run/mysqld/...
1 vote
3 answers
605 views

Random MySQL connectivity issues?

I can run the exact same command over and over again and sometimes it works, sometimes it doesn't: root@bak-rrk9m:/# mysql -Bsuroot -p"$MYSQL_ROOT_PASSWORD" -h"$...
2 votes
2 answers
929 views

Website inaccessible until host is pinged from client (on a class A subnet)

There is this really weird issue on the internal network, this happens constantly to "random" machines. Machine (client) boots up, goes to some-intern-website-which-is-not-accessible-from-internet....
1 vote
1 answer
3k views

Can ping, can establish SSH connection in one way but not on other way

First of all, sorry for my English. We're facing a very strange problem with SSH connection between two specific servers. Let's say we have X1, X2 and Y servers. Where X1 and X2 are behind the same ...
-1 votes
1 answer
2k views

Router drops connection

We are having trouble with our Draytek router, and I thought this would be the best place to ask. Our current set-up: Cisco EPC3925 modem to our connection point Draytek Vigor2850 router connected ...
0 votes
1 answer
3k views

Apache Empty response Diognosis

My server gives empty response randomly. This is about four weeks that I cant figure out what is the problem. I will try my best to give you extensive information about my problem. sever specs: ...
0 votes
1 answer
2k views

MySQL Bad Handshake to MySQL Cluster behind Proxy

I have just set up a MySQL cluster using five hyperV linux boxes (2x management nodes, 2 data nodes and 1 proxy) having followed (with a bit of tweaking) the instructions here. Everything works fine ...
2 votes
1 answer
2k views

Can not see drive in Remote Desktop Connection

I did an upgrade from Windows XP to Windows 7. Since I did that I can not see my drive. Of course I set the local ressources settings and the remote settings. The operating system on my server is ...
1 vote
1 answer
2k views

Access OpenVPN connection from local network through WAN IP?

I have 2 machines at home, one is a pine64 running a Debian linux and a desktop PC with windows 8. I successfully installed openVPN server to the pine64 so I have a working setup, the openVPN service ...
3 votes
3 answers
2k views

How to track down connectivity drops

My company just changed it's old firewall (Zyxel ZyWALL 70) with a new one (Zyxel ZyWALL USG 300). Everything seems to be working fine but sometimes, in a non-periodic span of time, connectivity ...
-1 votes
1 answer
120 views

User in Iran can't communicate with my server in the U.S

Someone on Iran is unable to connect to my service which is hosted on a server in the U.S. It seems like most other services work for them fine but mine does not. I asked them to ping the server and ...
0 votes
1 answer
678 views

ping, but no throughput to server via wireguard from raspberry pi

I have a wireguard setup with a dedicated root server machine acting as the vpn subnet`s server. As clients, I want to connect a lot of raspberry-pi clients (3&4) - all of them having their own ...
7 votes
2 answers
7k views

Certificates in SQL Server 2008

I need to implement SSL for transmissions between my application and Sql Server 2008. I am using Windows 7, Sql Server 2008, Sql Server Management Studio, and my application is written in c#. I was ...
3 votes
1 answer
2k views

Ubuntu 16.04 server is listening but not accepting incoming requests

I recently upgraded my server from Ubuntu 14.04 to 16.04. The upgrade seemed successful (so I'm not sure if it's related) but about a week in I restarted the host and it now will not accept remote ...
106 votes
15 answers
394k views

ssh tunnel refusing connections with "channel 2: open failed"

All of a sudden (read: without changing any parameters) my netbsd virtualmachine started acting oddly. The symptoms concern ssh tunneling. From my laptop I launch: $ ssh -L 7000:localhost:7000 user@...
0 votes
2 answers
3k views

Using a specific network adapter for a service

On a Synology NAS this is called: Service-interface binding Is there something to specify the network adapter used by a certain service? I don't wan't all applications running on that adapter. I only ...

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