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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TCP connection stuck in SYN_RECV state despite ACK received

My client and server are both internal machines. tcpdump on both client and server show all three parts of handshake are communicated, however netstat on server shows SYN_RECV, and on client shows ...
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76 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....
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94 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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304 views

what can put linux process managing connection pool into bad state, so it restarts them continously?

I have an application with pool of connections to MySQL. At some point, in production, every 1-3 seconds some socket is closed. As a result my app restarts this connection. This is pretty big pool ...
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23k views

Cannot telnet to SQL Server on port 1433

I've been working solidly on this issue for the past three weeks. I cannot seem to find where the actual issue is. I just recently found this article on how to troubleshoot the connection. I made it ...
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29 views

Windows Server 2012R2 VPN client connects, but nothing else

I installed VPN on our 2012r2 Server. This network does not have a domain, it simply in workgroup configuration. From the VPN clients, I can connect to the VPN, but that is all. I can't ping ...
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56 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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75 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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162 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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289 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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166 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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59 views

Weird proxy behaviour

I recently installed a computer in a network that is behind a proxy, I configured a reverse ssh tunnel to connect to it, and tunneled the ssh connection with corkscrew to connect to a server, this ...
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2k views

mod_jk losing connection with tomcat

I'm running an Apache tomcat + mod_jk 1.2.40 behind an apache web server. Everything has been setup and works properly for some amount of time since a tomcat startup (measurable in days/weeks); then ...
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409 views

Amazon AWS connection issues

I have a strange issue with my Amazon EC2 instance. I have created the following: m3.medium instance hosted in the Amazon cloud This instance runs the following a. Apache Tomcat application server ...
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609 views

Apache2 mod_proxy_fcgi closes a connection after each request

I set up mod_proxy_fcgi do go with apache and php-fpm. If I read the FCGI spec correctly, the typical flow for the communication between a server is to keep the connections between the web server and ...
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2k views

VmWare Host connection keeps on breaking

I have installed VMware ESXi 5.1 and configured the static IP. When I try to connect to the host using the vSphere Client it logs in sucessfully. But after that when I try to access any thing I get ...
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2k views

SQL Server 2008 R2 Express connection error

Hi I'm having issues with SQL connection for a client PC We have software that uses SQL database, and I have just updated from SQL2005 to SQL2008 We have 5 pcs: 2 x vista (32 bit) 2 x win7 (64bit) ...
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2k views

VMWare ESXi 5.0 Networking Issue

I have an issue with 2 new ESXi hosts. OS - ESXi5.0 Custom Dell ISO patched up to Build 1024429 DELL R820 with 1G network 2 ports from integrated MB NIC(Intel) connected to 2 juniper switches, one is ...
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279 views

Mystery WIFI connection interruption

The issue is that Windows users disconnected from WIFI network every 2~10 minutes, Mac users are less frequent but still get kicked off 1 or 2 times a day. We don't have such issue with any wired ...
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2k views

SQL Server Replication Requires the actual server name

How Hard can it be? Ive spent the last 4 hours googling just to find either nothing works, or people randomly posting information that 'sounds good' My setup: Two SQL2012 Servers, in two different ...
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454 views

Random, sustained connection failures

My first question here - hope I'm in the right place. In essence, I have a Java app that occasionally seems to have difficulty connecting and I've run out of ideas for where to look. Hoping for some ...
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817 views

java.net.ConnectException: Connection timed out, Tomcat 7 and iptables

I am experiencing a weird problem.. Basically our Java developer said that in the java application the services that access the db to write on it get this error: java.net.ConnectException: ...
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55 views

VPN Network intermittantly fails to provide internet: What could be possible causes

We have a small office with our own VPN setup. We occasionally experience failures in our internet connection where we cannot access the internet. Most of the time the internet connection will resume ...
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685 views

apache as proxy server ftp request connection times out for certain connections

I have setup my apache to act as proxy server by configuring it as: [server]# cat /etc/apache2/httpd.conf Listen 10.2.28.56:8787 ProxyRequests on <Proxy *> Order deny,allow Deny from ...
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567 views

Switched Oracle to use Shared Servers, now Java app throws SQLRecoverableExceptions

This issue might blur the line between Java and database problem, so I apologize if this is the wrong place for it. Not sure which side is to blame yet. I'm a Java developer temporarily playing DBA ...
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514 views

Load balancer unable to contact a server through http

In our infrastructure we have a load balancer(apache mod_balancer) and three backend servers that run apache as a web service and iptables as firewall, Lately ONE of them is giving a lot of " (110)...
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30 views

Nginx closing connection

I recently set-up a staging server for our company. On it we run our rails applications & php websites and recently one of my https sites isn't working anymore. I have one configuration template ...
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17 views

How to force persisten connection squid

How do I make a persistent connection in squid, I'm using ubuntu 12 with squid 3.1.19, this is the request I do OPTIONS http://cmsprod.imusica.com.br/index.php HTTP/1.1 and response: HTTP/1.0 200 ...
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29 views

Port 1433 blocked to Azure SQL Server

I'm having an issue connecting to an Azure-hosted SQL Server. After much trial and error, and studying the handshake, I've determined that port 1433 is being blocked somewhere along the way. I've ...
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6 views

method for listening for samba connections

I am setting up my RPi to handle a number of NAS server tasks. The first is to locally host my HDD data over a samba share. The second is to become a bittorrent box (with deluge). From what I ...
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13 views

Route between E1 devices

I have this topology and I need to configure routing between my CISCO 2911 routers to connect my devices, that are using E1 without any timeslots separation.
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8 views

server error connection from another pc

I've created a PostGIS database in a computer but I can't connect to it from an another computer, the error message is connection time out, is the server accepting connections TCP/IP in port 5432? ...
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20 views

Draytek Vigor 2830n WAN connection dropouts

For the last two weeks we have been experiencing terrible connections speeds. When running a speed test it normally starts off OK at around 15Mbps but then drops to 0.7Mbs or below making working ...
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29 views

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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93 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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78 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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21 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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48 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, VPN/...
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38 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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43 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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9 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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30 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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25 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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293 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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134 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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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. ...
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179 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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135 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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147 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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159 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 ...