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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Limit nginx' simultaneous connections to an upstream server

My setup consists of an nginx server and a Node.js upstream server. How can I limit the number of connections between nginx and the upstream server? The intended behavior is: nginx keeps exactly n ...
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2answers
56 views

Apache2: How to track client download progress on server side

I'm running an Apache2 on Ubuntu Server. A client downloads a large file (appx. 2GB) from that server using a browser. How do I track the progress of that download on server-side. I'd like to see how ...
-5
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1answer
66 views

Commercial Dedicated vs Shared Residential Internet [duplicate]

I recently purchased a server to mess around with. I want to be able to host a few of my own sites, but my home internet is about 5Mbps up and down. I was looking into colo at my local DC and they are ...
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0answers
115 views

“Connection timed out” on Debian jessie after some successful tries

I have a root server hosted at Hetzner. After upgrading the server to debian jessie I experience connectivity problems. After connecting successfully to the server for 2 to 5 times it stops answering ...
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4answers
216 views

Multi RDP connections as an Admin to the domain controller

We have a 2008 r2 server that's everything in one. It's a domain controller plus it runs some applications. I know it's a not a good design but it is what it is. Since it's a domain controller, it ...
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1answer
49 views

Extremely flaky connection to our EC2 instance through one connection, but not others

We have a robotic coffee barista deployed at the Dell campus in North Austin, with internet service through Time Warner Cable. We have been fighting intermittent connection losses between 10PM - 1AM ...
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0answers
53 views

mysql-cli - force quit on timeout / connection drop

I have set timeouts in /etc/profile.d/ to disconnect inactive users using TMOUT and this works great however now I am seeing users just holding their connection open by keeping some foreground process ...
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0answers
134 views

Network disconnecting frequently in centos 7

I am in a problem. i am having a scenario with a centos 7 server hosting a website. everything was fine. but i had a power failure which affected the UPS with an overload, causing it to reset. So my ...
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1answer
16 views

Is it possible to use SPDY module for non-secure connections?

SPDY module is designed to only work with secure connections (SSL-enabled websites). I want to know there is any fork of that project (specifically MOD_SPDY for apache) which bypasses SSL and works ...
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2answers
51 views

What is the cause for TCP flow control misinterpretation?

The client cannot connect to our web server. I sniffed the client and web server only to found out that the client sees the TCP connection to be successful while the server see it as a failure. What ...
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0answers
148 views

Motorola WT41N0 not connecting to internet

for some reason one of our handhelds won't establish a steady connection. We are using Fusion version X_2.02.0.0.016R and the handheld is using Windows 7.00.2824. I have the same exact settings on ...
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1answer
189 views

AWS connect to private subnet instance without going through NAT

First of all, I know this is not something you should always do but for now It would save many hours if it were in fact possible. I am able to do the following: ssh (with .pem) -> NAT -> ssh ...
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1answer
281 views

How to verify that a firewall closes inactive connections?

How can I verify that a firewall closes connections on port X to a server after N minutes of inactivity? Background: I am working on a Java EE application deployed to a Glassfish application server. ...
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2answers
84 views

Best ways to establish connectivity at each layer of OSI model

We all know that ping is the most common way to establish layer 3 connectivity. Layer 1 connectivity is established by link light. Layer 2 connectivity is establish by checking if link protocol ...
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2answers
351 views

“Software caused connection abort” after removing rule in iptables

I use Putty to connect to a Linux Red Hat machine on an AWS instance. My local computer is Windows 8. On the iptables I had to make a change and accidentally forgot to put back this default rule: -A ...
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1answer
29 views

Max connection on a specific Application

I've an application ( that contain some Web Services ) deployed on a Server in a WAS 7 environement. That server host a many application; what I'm looking for is a way to limit the number of ...
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0answers
71 views

Microsoft Azure and Glassfish

I am having a problem with Azure database and glassfish. Azure database is closing the connection with glassfish pool after 2 minutes. I found the solution but I am having a hard time implementing it, ...
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1answer
306 views

Too many open connections [duplicate]

I have a dedicated server with 32GB RAM. It works all fine till some punters came to ddos my server. I had really high uplink bandwidth usage (over 150Mbps). I looked at netstat with the following ...
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2answers
226 views

Keeping TCP connections alive to track which clients are online

I am developing an application where a server needs to stay in touch with lots of simple IoT devices. Nearly no information exchange is needed between the server and each device, but devices need to ...
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154 views

Inconsistency in TCP and HTTP connection management

I observe following scenario in WireShark: The problem I see here is that after receiving [FIN, ACK] from server (4090) and acknowledging it (4092), http client attempts to send another HTTP ...
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1answer
28 views

Is there a way to know the duration for which the connection is open using lsof?

If not possible with lsof what other way to find the time for which the connection is open on a machine. Please do let me know if you need any other information.
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1answer
78 views

Video Streming server outbound bandwidth and providers [closed]

Imagine the case of Twitter Periscope or Meerkat.The paradigm of their servers is that they recieve video from users and then stream it to a large amount of users (say > 100K for the sake of this ...
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1answer
46 views

No internet connection via my OpenVPN server (solved)

I have OpenVPN up and running on my server. I want all traffic from my clients to be routed trough the VPN server. The client connects just fine but is unable to connect to the internet. Server ...
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0answers
163 views

What causes the “connecting” and “waiting” for seconds on HTTP GET requests with nginx?

What causes for the delay in connecting to an Nginx server and for the Waiting time are under an admin's control? I've set up GTMetrix to run daily web page load speed tests, and sometimes I get ...
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1answer
253 views

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 ...
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0answers
82 views

String domain on RDP file not working

I am about to flash 80 HP T620 Thin Clients (TC) which will only be used to launch an RDP file so users can connect to their virtual machines on our Hyper-V environment. In the end, the TCs will be ...
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4answers
295 views

MYSQL - is LOCALHOST speedy than i.e. (domain) mysql.domain.com [closed]

I am interested, on some hosting(although they are paid hostings, for example, DreamHost. probably 000webhost too), in database server, you have to insert: mysql.domain.com (instead of: localhost). I ...
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2answers
631 views

better alternative for tcp_syncookies in linux

In an effort to prevent DDOS attacks I followed suggestions to leave /proc/sys/net/ipv4/tcp_syncookies value set to 1 in my linux box to enable TCP syncookies. However, when I look at this URL: http:/...
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0answers
64 views

Slow IIS site performance for certain network conditions

I'm trying to determine the cause certain uses are seeing on an IIS site I work with. Users started to mention this slowness to us a month or so ago and I've been trying to determine the cause of it ...
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0answers
265 views

LDAP build script failing on openLDAP-2.4.31 ( ldapmodify -Y EXTERNAL -H ldapi:/// )

ORIGINAL QUESTION: I want to set the password to the backend admin so that I can change the LDAP ACL to what I need... needless to say I don't want my config posted all over the place, plus the .ldif ...
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2answers
102 views

Transparent switch from Wifi to ethernet

I have the following network setup: Zyxel USG 200 Firewall which also acts as DHCP server 2 Switches 2 Wifi APs (Zyxel NWA3560-N and WAC6503D-S) with NAT and DHCP disabled The clients (mostly ...
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1answer
118 views

NIC seems slow, even on 100Mb/s full duplex [closed]

So I have a server running Centos 6 64bit with cPanel. It's set on eth0 running at 100MB/s full duplex. But, one particular server seems sluggish on its connectivity, despite server load being minimal ...
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1answer
139 views

How can I build connections among four OSs, especially between two Ubuntus? [closed]

More background information: Two Ubuntu 14.x systems both hosted in Windows using VMware Workstation 10: Ubuntu server in Windows 7 and Ubuntu guest in Windows 8.1. Public IP is limited, so using ...
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4answers
158 views

How to access a machine with a wrong network address?

I have a Windows Active Directory network in a LAN of addresses 192.168.10.0/24. I have another site that has addresses of 192.168.11.0/24, where all AD servers are in the 192.168.10.0/24 site (I know,...
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4answers
181 views

is it safe to change the RDP port?

My web server is in the U.S. and it is accessed from my home in Canada using Remote Desktop Connection, standard port. Unauthorized persons have tried to log in from many different countries, some ...
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1answer
45 views

How to troubleshoot connection error from windows to unix?

Sidenote: I am still trying to fix this issue. I have a ubuntu server running bind on 192.168.0.2, listening to :53 # netstat -tulpn //output shortened tcp 0 0 192.168.0.2:53 0.0.0.0:* LISTEN 3795/...
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303 views

Banned from SSH Centos server but can't find where

For some reason my ip address is banned from using ssh or sftp. I have no problem connecting to the server using an other ip nor i have problems reaching all other services (like http, teamspeak) with ...
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1answer
146 views

Too Many HTTP Requests from one source

We are having an issue at one of our customer sites where Tripwire is flagging events when more than 1000 HTTP connections are being individually created from different IP addresses within a span of ...
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1answer
270 views

MySql Clients connection timeout randomly

I have 100 PC clients connecting to MySQL over LAN. They're running INSERT querys with no particular period.Statistically, at the same time no more than 10 PCs are trying to run INSERT query. This is ...
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1answer
5k views

Zabbix Cannot Get Value From Agent [closed]

I am attempting to connect Zabbix to a host and am getting the error: Get value from agent failed: cannot connect to [[xxx.xxx.xxx.xxx]:10050]: [4] Interrupted system call I am not sure why this ...
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0answers
161 views

What happens if a machine gets a SYN/ACK packet without sending initial SYN packet?

I'm thinking of a situation where an attacker manipulates a SYN packet that was sent from A's source IP address to B. The server will receive the packet and think it's a legitimate packet, and send a ...
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1answer
98 views

Concurrent connections per IP

I need to make a few changes to a firewall configuration, but before I do I'd like to see the number of concurrent Apache connections per IP. This command produces a nice list: #netstat -ntu | awk '{...
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votes
1answer
94 views

IPv6 connections from outside the LAN are timing out; what is blocking the connection?

as I understand with ipv6 there is no NAT so every client on a network will get a different public ip address (so there is no need for port forwarding). so I checked on my network and indeed every ...
56
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5answers
7k views

I accidentaly forbid SSH connection to a remote server… What's next?

Let's say it again, we all make mistakes, and I have just made one. A brief history: I was doing some stuff on a VPS (Debian) I'm renting, when I noticed some strange behaviour. Using the netstat ...
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3answers
5k views

Can't connect computer to domain [closed]

I can not connect a computer to Server 2012 R2. the error message I receive is Note: This information is intended for a network administrator. If you are not your network's administrator, notify the ...
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1answer
222 views

Ipvsadm to monitor connections on a load balancer

I am working on to set up Haproxy on a load balancer with two backend web servers in the first period. The problem I am facing is to monitor number of connections to each of my web servers. I have ...
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1answer
232 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 ...
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2answers
172 views

Website is down but only for me

I have a website that is working fine for everyone but throws an error whenever I try and access it. The web developer is saying it is a problem with my network. What should I check to confirm this? ...
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4answers
2k views

telnet cannot connect to port without firewall

If I try to connect to MySQL with telnet myhost.com 3306 I get a network not reachable error, even when I flush all iptables rules. I can reach other ports like ssh (with the same iptables rules ...
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2answers
3k views

Siege: descriptor table full sock.c:119: Too many open files

I am trying to make a stress test in my own server using siege with the following command: $ siege -c 500 myweb.com/somefile.php But I get this error: [error] descriptor table full sock.c:119: Too ...