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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Can access server via SSH/FTP but other protocols won't work

I followed this guide to setup an "Upside-Down Ternet." Everything was fine up until the part where I configured IPTABLES then I lost SSH connection. Now I expected that because I'm messing with ...
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8 views

telnet “connection closed by foreign host” for some servers, not all

I started having issues connecting to our mail server on 1 server, but the others are able to connect without issue. telnet my.smtp.server 25 Trying 1.2.3.4... Connected to my.smtp.server. Escape ...
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28 views

Jenkins best practices for inter region connectivity in AWS [on hold]

One of the new requirement that I have is trying to use my Jenkins server which is set up in my AWS us-east account to deploy code to the application servers(in a private subnet) in the AWS china ...
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0answers
28 views

Connecting to a MariaDB server with master-master replication setup hangs randomly

I have a two server MariaDB master-master setup as documented on the DigitalOcean community page: https://www.digitalocean.com/community/tutorials/how-to-set-up-mysql-master-master-replication. The ...
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0answers
10 views

Force an application to use a specific connection [migrated]

So my Mint 17 has 2 connections (wired and wireless) when both connected by default the wired is used, what I want to do is keep wireless for file download and general Internet usage, and use the ...
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1answer
43 views

Samba connection reset on Windows 7 (System error 5)

I am having problems setting up a Samba server, or to be more exact the problem is that i have set up the server, but it sometimes stops working for several hours and then starts again. It is always ...
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0answers
7 views

Windows/IIS7.5 half-closing connections resulting in sockets in TIME_WAIT

I'm seeing scenarios where the client side initiates the TCP close but the webserver (IIS 7.5) simply responds with an ACK and the connection ends up in TIME_WAIT. Why would it do that? Typical HTTP ...
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1answer
14 views

Cannot login to ssh - stdin: is not a tty

FIXED If you have seen this in the login screen of your server... stdin: is not a tty ...you know the trouble. Well. I've had the exact same problem on my root server. I tried several things to ...
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43 views

One-way connectivity on DC

I have a Windows Server 2012 R2 server as a domain controller and DNS server for the AD-integrated domain. Using the server's IP, the server can be pinged, the default IIS website can be accessed, ...
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18 views

Google Cloud Messaging - server side - connection 502 error

i have problem with connection from my application server to GCM : gcm.googleapis.com:5235 Exception: XMPPError connecting to gcm.googleapis.com:5235.; : remote-server-error(502) I have exact same ...
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1answer
31 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: ...
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1answer
41 views

Running nginx on AWS is sending back 'ERR_CONNECTION_TIMED_OUT' responses

I have installed nginx on an Ubuntu AWS (EC2) node and confirmed it is running via ps -aef | grep nginx. In the server section I have: server { listen 8080; server_name ...
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1answer
37 views

Iptables: Difference between RELATED and ESTABLISHED state?

I've tried reading many articles on the internet but none of them are quite clear. I also know similar question has been posted here before but none of them explain my situation. Earlier I ended up ...
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0answers
36 views

Ubuntu 14.04 SSH from Third Party, No Error Cause

I have two instances of Ubuntu 14.04 running. I am utilizing a third party service that accesses the instance(s) via ssh using its own generated key pair, of which it provides me the public key. I ...
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0answers
7 views

Can't connect to the IBM bladcenter switch

I got IBM 8677 bladecenter with hs21 type 8853 & 7995 I connect the Ethernet SM I\O module , configed it in the IMM to same subnet as my host. I dont know why , but I cant telnet it or ping it . ...
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2answers
40 views

IPv6 DNS Connectivity through IPv6

My clients are using IPv4 in the USA. Their ISP is not ready for IPv6 yet. My public web server is on only IPv6. It is registered with a DNS Provider(GoDaddy) that is IPv4 and IPv6 enabled. Can my ...
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26 views

nginx access log and $connection variable

!Hi, guys! I've added $connection variable to output of nginx access log and everything seemed working fine. But i've noticed that sometimes different client IP's assigned to the same connection. Up ...
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1answer
38 views

SSH RDP Tunnel and Port Connection

Tried doing some research but can't really figure out the solution (or how to troubleshoot further) for this problem. Objective and Reasoning for setting this up: SSH Tunnel RDP from work to home ...
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0answers
22 views

MONGO - mongod - no connection to database [duplicate]

i have an testserver running under ubuntu 14.04 with public ip address. On this i have plesk 12.5 and mongodb 3.2. For administration of mongo i installed phpmongodb. Then created an database, an ...
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1answer
46 views

Increase Connection Timeout for “ssh: connect to host xxxxx port 22: Connection timed out”

I need to perform a sort of scan over 20k+ machines in the network (all linux), and I am using ssh to connect to each machine, run a small command on it, and gather the output. I am running parallel ...
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0answers
20 views

Does nginx consider a page request as one request or more (including static files)?

Lets say we have a configuration as below: http { limit_conn_zone $binary_remote_addr zone=conn_limit1:12m; limit_conn_zone $server_name zone=conn_limit2:24m; [...] server ...
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1answer
67 views

Nginx Stress Test with httperf - Large Data Transfer Differences from Apache Server

I'm running a simple httperf stress test on a quad-core Nginx server, pointed at an HTML/PHP document. Large connection rates quickly begin experiencing high connection and response times (see the ...
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1answer
43 views

What is the difference criterion between max_clients and max_conns? [closed]

I'm new to server administration; What are the main \ Criterial differences between max_connections and max_clients a server can handle? It can be sound very similar,
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1answer
34 views

How to change MySQL user permission temporarily (Per Connection)

I do not know if it is possible at all or not. What I want is that, when a certain connection is established, the user not be able to modify data with that connection. This is the scenario: ...
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143 views

Apache times out unexpectedly ( despite setting Timeout in httpd.conf )

I've a PHP script (on centos, apache 2.2, php 5.4 & apache-mod-php5) that its execution takes about 2 minutes, but 1 minute after sending request, my connection to apache server times out and ...
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2answers
46 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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0answers
67 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 ...
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0answers
94 views

SQL Server 2008 R2 eventually sends RST instead of FIN/ACK

My SQL Server 2008 R2, running on Windows Server 2012 R2 unexpectedly sends connection resets (RST packets) to its clients performing series of small queries. The problem is, it eventually happens. ...
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0answers
10 views

debug connection to other server

My server suddently is unable to connect to other servers through Curl, file_get_contents etc. This issue is reported for at least 5 different server Ips. Whereas it still works with many others. ...
4
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1answer
1k views

Why are connections in FIN_WAIT2 state not closed by the Linux kernel?

I have an issue in a long-lived process called kube-proxy being part of Kubernetes. The problem is that from time to time a connection is left in FIN_WAIT2 state. $ sudo netstat -tpn | grep ...
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votes
1answer
69 views

Connect remotely to Database by SoftEther VPN Client

As i have just started studying about Softether VPN, i have some questions : I want to work at home, and I installed SoftEther Server at my company, and SoftEther Client at home, I successfully ...
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1answer
130 views

ssh on Ubuntu fails after first time : Asymmetric routes, SSH connection fails to properly establish

I have been baffled by this problem... I have an exs host on subnet 10.128.0.1 and guests on 10.128.20.1 subnet. I have another box on 10.128.0.1 subnet with vms on 10.129.18.1 ... Router is simple ...
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1answer
104 views

How to stop tinyproxy from using “Proxy-Connection” header

I just setup tinyproxy for the first time, and I'm trying to make it mimic a normal connection as closely as possible. I already disabled the Via header, but I'm not sure how to change the ...
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1answer
82 views

Increment CouchDB concurrent connections

I'm using CouchDB to serve thousands of requests per second. When under heavy load, it seems to respond slowly so I began to ran tests with apache bench. Couch can respond 50k requests, 1k concurrent. ...
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votes
1answer
19 views

How to handle localized connectivity issues between web services

Our web application uses various web services, most of which are not managed by us, but by an external service provider (e.g. Auth0 is one of those services). Recently, our application failed ...
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0answers
79 views

HTTP DELETE timeout between Nginx and Application

We're facing a really weird error using HTTP DELETE, the symptom is occasionally the user gets a 504 (timeout) error in the browser. The requests flow through the steps described below: Browser -> ...
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0answers
96 views

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
40 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 ...
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votes
1answer
62 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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95 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
165 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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votes
1answer
46 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
47 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
106 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 ...
0
votes
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
48 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
116 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 ...
0
votes
1answer
163 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 ...
2
votes
1answer
199 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
74 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 ...