Questions tagged [connections]

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Routing all Traffic through a VPN Node while accepting incoming WAN Connections

I want to route all traffic through another VPN-Node, while: Keep the Connection to the VPN-Server active (already works) Still accepting WAN-Connections on that Client. My Client Node Configuration:...
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2 answers
184 views

iptables hashlimit rate is not working as expected

I wrote the following firewall rule: iptables -A INPUT -m hashlimit --hashlimit 1/hour --hashlimit-burst 3 --hashlimit-mode srcip,dstport --hashlimit-name ssh -j ACCEPT I was expecting the burst to ...
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Why does a MySQL select sometimes not create a "client connection"?

I'm doing some testing (on my dev server) to help me figure out what is causing the ever growing list of connections on my production server. My assumption is that there are certain pages that are ...
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2 answers
2k views

How do I change MySQL wait_timeout in production environment at runtime?

I'm running Windows, IIS, MySQL, PHP. In my.ini under [mysqld] the value for wait_timeout is set to 60. wait_timeout = 60 But when I execute the following: show variables like 'wait_timeout'; It ...
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Is this a normal number of database connections?

Check out this graph of my database connections. I am running a Postgres database on Lightsail, and I am connecting to it from a single Ubuntu instance running a single instance of Express and ...
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MySQL shows lot of connections

I checked my MySQL process list using "show processlist;"and it is showed nothing, But I used "show status like 'Conn%';" to check the connections and it is showed me around 9K ...
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-1 votes
1 answer
45 views

Prevent proxies connect in my dedicated server

I have one dedicated server, and I use IPTABLES for firewall. Recently, I received a lot of connections (attacks) using proxies to change IPS, and bypass firewall. Have anything do, for prevent ...
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many connections to one of our website

We are hosting multiple websites with Nginx as an SSL terminator. All traffics are proxied through Nginx to backend servers. There are many connections to one of our websites, netstat shows: # ...
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2 votes
1 answer
1k views

Data Factory Linked Service for Google BigQuery KeyFil Path

In Google Cloud I have a BigQuery account and I have a Service Account defined there. I want to set up a Linked Service in Azure Data Factory so that I can extract data from BigQuery. I have generated ...
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1 answer
293 views

How to configure IIS 7.5 to allow more than one PHP connection per browser?

On our dev server, I hit /bigreport.php, which connects to MySQL and runs a report. It takes a few minutes. In another browser tab, I navigate to /smallreport.php, which connects to MySQL and runs a ...
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Why is server is waiting with second request untill first is fisnished

Not sure what it is, but everytime I try to run one http request from browser, second must wait for first to fisnish. Is it server side configuration/seciurirty? For example, I have 2 files long.php ...
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Postfix: define a global concurrency_limit

I need to limit the simultaneous outgoing connections Postfix can make. It is possible to limit the number of connection per destination with transport_destination_concurrency_limit, but not globally ...
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1 answer
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Azure components connectivity check

My Project involves various azure products like web job, Event hub, table storage, blob storage etc. I need to create a Live dashboard which shows the connectivity of the various components. Eg., ...
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1 vote
1 answer
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I have 6 wan connections, what's the best way to load balance them?

5 diferent companies are going to share the same building, and each one of them have one internet link. I have to use all of the links because of bureaucracy stuff. My server only have 4 LAN boards. ...
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1 answer
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Increase number of rsh connections [closed]

We are using a Server with OS RHEL 7.2 server version. Number of rsh connections to the system is limited to a number around 70. We are getting a message Connection reset by peer from server as that ...
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2 answers
263 views

FTP sites can't be accessed from GUI programs, only command-line

We have a Windows Server 2012 R2 box, running IIS 6.2 (Build 9200). This is a Rackspace server. The server was running one FTP site, with no issues. We had worked with Rackspace originally to get ...
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  • 356
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1 answer
886 views

Identify failing or hanging outbound network connections on linux

I admin a busy webserver which uses nginx/php-fpm , connects out to mysql(RDS) and elasticsearch, but also many third parties for advertising and other plugins etc are on the site(unfortunately I’m ...
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Sudden increase nf_conntrack / ip_conntrack

Often there is a sudden increase in ip_conntrack connections on my server. (See image below). This sudden increase results in a abnormal increase in SYN_SENT connections.(see screenshot) This is a ...
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2 answers
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Is it possible having two Ethernet connections simultaneously on the same UTP Cat6 cable? [closed]

Actually it is a two part question. 1.Since an ethernet connection only requires 2 pairs (green and orange), is it feasible to wire blue and brown pairs to a different Lan port of a router and ...
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1 vote
2 answers
78 views

Can a average computer configured as a router support any number of users (connected clients)? [closed]

I am planning to install a router for a rather big amount of users (50-100), and I have found home routers very unstable for this high number of devices. When researching, I have found this report ...
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2 votes
1 answer
355 views

Trying to estimate concurrent connections on my server - is this the right approach?

My goal is to find out, roughly, how many apache2 connections my server can handle at one time. I've gone through all of my running processes, including the apache2 processes, and figure that of the ...
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7 votes
1 answer
14k views

How to allow more than two simultanous sessions on Azure

One of our servers is on Azure and we are remotely connecting to it. Unfortunately Azure allows only two users to be logged in at the same time. When the third user tries to log in, he is given the ...
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1 answer
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A LOT of connections from my external IP address to my web server

I installed Nagios recently on a Debian machine running an Apache web server among other things. The thing is that lately, Nagios tells me that the HTTP service is failing intermittently and it seems ...
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-1 votes
1 answer
1k views

Connecting two GNS3 setups in two VMs in the same PC

How do i connect these two gns3 setups in different VMs? It's all in the same PC. My end goal would be to ping each VPC to each other. I am already able to ping VPCs in with different VLANs but only ...
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1 vote
1 answer
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connection initiated from linux localhost

One of the linux server was compromised and some of the connections are being originated from localhost to a remote location putting up the information residing on it. I'm trying to trace all outgoing ...
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2 answers
2k views

increase nginx active connection more than 65535

currently I'm doing setup for nginx to accept C1M, I do in my Virtual BOX with Centos 7.0 and RAM 10G. Here my sysctl.conf configuration. fs.file-max = 9999999 fs.nr_open ...
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0 votes
1 answer
491 views

MySQL connections not closing

I have a web application running on Tomcat7 that connects to MySQL 5.5. I have two servers running the identical code: Ubuntu Red Hat The Ubuntu one runs fine maintaining a steady 8-16 connections, ...
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-1 votes
3 answers
190 views

3x networks, hardware in 2 locations, 1 connection to join them

Sorry it was hard to think of a title for this, so hopefully I can explain my situation. We have hardware (unix servers) on 3 different network subnets. For example: 10.44.1.0 10.44.2.0 10.44.3.0 ...
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1 vote
0 answers
102 views

How do I figure out the number of concurrent connections?

Our server architecture is as follows: Windows 2008 Server RC2 WampServer with Apache 2, PHP 5, MySQL 5 Dedicated connection hits firewall, which is routed to a single web server with multiple vhosts ...
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0 votes
2 answers
2k views

FreeBSD Established Connections Maxing out at 300

We've previously had issues in our environment where it seemed we were reaching FreeBSDs max connection limit. We took action demonstrated by http://nginx.org/en/docs/freebsd_tuning.html and bumped up ...
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0 votes
1 answer
1k views

Open file count keeps increasing forever

I'm experiencing issues with the number of files opened increasing over time. If I run my server for about few hours, it'll no more accept any connections. The limit was 1024. I've increased the limit ...
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1 vote
1 answer
693 views

nginx and Mysql Server Load limits (depend on Server config)

my server config is Technology: Ivy Bridge Processor: Intel Xeon E3 1245v2 Intel Smart Cache: 8MB Cores: 4 Threads: 8 Frequency: 3.4GHz+ Turbo Boost: 3.8GHz Virtualization: yes ...
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0 votes
1 answer
435 views

syslog-ng 2.0.9 closing tcp connections from some clients instantly..?

I've a syslog-ng instance on 2.0.9, which is old, but... this is enterprise IT and upgrading the versions is... fun... running on Solaris 10. I have this strange problem where some clients stop being ...
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0 votes
1 answer
549 views

minicom cmd not showing

I am using minicom in centos to try to connect to a cisco router. I did the configuration with minicom -s changed the serial port to the appropriate one /dev/ttyS1. Saved as dfl. and Exit. When ...
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8 votes
1 answer
29k views

Too many established connections left open

I have a (probably quite old) CentOS 4.5 server with a custom java application running inside. I found the application was crashing after some running time and found it was handling 1024 connections ...
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2 votes
2 answers
118 views

aggregating multiple ISP connections

OK, so we have an office in Pakistan. Phone and ISP service is pretty poor there, so they have 2 ISP connections, one thru Pakistan telecom, one thru a different ISP. The PK tele one has a router that ...
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1 vote
1 answer
793 views

Can multiple servers listen on the same port when no Bind/Accept has occured

When you have a Windows machine (server or home edition) which is running 2 servers, and they are both listening on port 4000, however none have had a request to connect? What happens when a client ...
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0 votes
2 answers
49k views

Can ping servers but cannot connect to them

Sorry in advance if this question is a bit newbi-ish. I downloaded Microsoft Connection Manager and added multiple .rdg files for different servers I need to access. I can browse to only a few of them,...
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3 votes
1 answer
5k views

Mysql remote connections logging

I need to allow remote connections to my mysql server running on latest stable CentOS. I don't like this idea at all so I want at least to collect as much relevant information as possible. To be ...
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26 votes
3 answers
78k views

What value of thread_cache_size should I use?

I'm using Asp.Net together with MySQL. In the .Net connection string, I have set Max Pool Size to 150. If I run the following I get these values: SHOW GLOBAL STATUS LIKE 'max_used_connections'; ...
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5 votes
2 answers
3k views

Windows 7 Network Connections empty

Whenever I try to look at my network connections, the window opens up empty. The only thing shown is the Organize button. I went into Device Manager and deleted my network devices, but now ...
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3 votes
2 answers
713 views

On a LAMP stack, how to limit the number of concurrent connections and serve a static page for those who are beyond that limit?

I'm aware of the Apache directives MaxClients and ListenBacklog. I'm trying to set a limit of, let's say 100 concurrent connections after which the new connections will be served a static page. Can ...
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1 vote
1 answer
9k views

haproxy and persistant connections

I am using HAproxy to load balance between more web server. Those webservers are using PHP and sessions to keep one's session open. Now, I think that when a user refreshes the page, it is sent to one ...
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0 votes
1 answer
4k views

limiting the number of global connections per second

I want to limit the number of ALL incoming NEW connections on a port, not only from one IP, something like: iptables -I INPUT -p tcp --dport 22 -m state --state NEW -m limit --limit 3/s -j DROP But ...
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2 votes
2 answers
1k views

How can I connect to some old Sun servers?

We have some old Sun servers (V125, V210, V240, T2000 amongst others) sitting unused and I've been asked to find out if there is anything useful on them before they get wiped and disposed of. However,...
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2 votes
2 answers
788 views

CentOS 6.2: apache stops accepting connections

I have server with CentOS 6.2, apache 2.2, php 5.3, mysql 5.1. Server is installed in KVM container. From time to time apache stalls. It just stops accepting connections. Looks like it reaches ...
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1 vote
1 answer
3k views

windows 2008 R2 server IIS 7.5 not loading pages on first visit...requires refresh 2 or 3 times

This could be a network thing at my ISP where my box is colocated...not entirely sure. I wanted to just check here to see if anyone has seen an issue like this that is server related so I can check ...
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0 votes
1 answer
826 views

Best way to connect two separate networks with separate internet connections within the same building

I'm a programming intern, and since I'm the only one in the company who seems to have rudimentary knowledge of Linux I've been given the task of setting up a network so that employees may share files ...
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2 answers
5k views

Very large number open connections from web to DB server

I run 2 servers, 1 web (nginx/php), 1 database (mysql). Nginx has about 1500 active processes per second, and mysql status shows about 15 currently option connections on average. Now today i started ...
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1 vote
3 answers
830 views

Cached content causing a huge number of 404 errors, too many connections

My site has been largely unresponsive for three days due to a large amount of traffic. A JavaScript element on the page regularly requested images from the server, and the number of connections ...
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