Questions tagged [keep-alive]

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Nginx - Keepalive Connection Management

Use Cases we have a edge server (exposed to client), which is directly accepting connection requests from single or multiple clients edge server is proxy passing all the requests to internal upstream ...
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On Debian system, keepalived is consuming full cpu usage on both kibana nodes

I have master/slave kibana machines on Debian 10. From few days, cpu usage of keepalived daemon on both nodes are reaching to 100%. After keepalived restart it goes to normal, and this loops forever. ...
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AWS ALB and HAProxy Keep-Alive header

Has any one come across this behavior? AWS ALB is sending traffic to HaProxy. HaProxy sets keep-alive header to 29 seconds. Client connected to ALB does not see this header. It can only see "...
2 votes
1 answer
927 views

nginx: log which requests where done over the same keep-alive connection

Is there any way to create a custom log file, that allows to see which requests were handled in the same keep-alive session? I'd like to create some logs and to estimate how often new sessions are ...
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keepalive_disable parameters nginx for particular useragent/browsers

I am using keepalive_disable in nginx conf this requires for Syntax: keepalive_disable none | browser ...; Default: keepalive_disable msie6; Context: http, server, location Now i have two ...
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Why does Amazon recommends reading 'all data' as soon as possible during S3 download?

While reading up official documentation on Amazon S3 Java SDK, I found an interesting note: Your network connection remains open until you read all of the data or close the input stream. We ...
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1 answer
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HTTP client leaking connections when keep-alive is enabled

I have set up an HTTP server for an embedded system to communicate with a known non-malicious remote client application. I have had to disable keep-alive support on my server, as the remote client ...
0 votes
2 answers
4k views

how to emulate a browser that doesn't have "Keep alive"

I have a remote webserver listening on port 80, which serves a page which loads 100 individual .png files (from the same server and hostname) via 100 <img /> tags. On that remote server I do ...
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1 vote
2 answers
3k views

Is there a way to keep internet connection alive?

Im running linux and I have a task which runs only after midnight. The internet connection I use for this, goes offline if there's a period of inactivity and I want to keep the internet connection ...
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1 answer
711 views

Can keep alive be enabled over secure https?

I've been trying to enable Keep Alive on my https site with no luck. Is it possible? Sometimes I see on my test page it says "connection closed." Here's what I have in my htaccess right now that ...
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2 votes
1 answer
4k views

Reducing HTTPS handshake by http-keepalive behind a load balancer - possible?

I have an api into which ill get quite a few requests in https. Since its restful, each time the api is sent , it requires a full ssl handshake. On enabling http-keepalive , the latency of the request ...
2 votes
2 answers
7k views

Configuring nginx reverse proxy to send TCP keep alive packets to server

We have IIS servers in Azure behind load balancer. Load balancer has unconfigurable timeout of 4 minutes after which inactive connection is killed. We're trying to setup nginx as a reverse proxy to ...
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1 vote
2 answers
6k views

HAProxy doesn't keep-alive http connection

I've switched on the option http-keep-alive in the defaults, as well as tried it in the frontend definition. But the Response Headers in the browser never show up keep-alive, although its there in ...
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12 votes
1 answer
36k views

Haproxy - timeout http-request vs timeout http-keep-alive vs timeout server

I'm trying to wrap my head around how the haproxy options timeout http-request <timeout> timeout http-keep-alive <timeout> timeout server <timeout> interact with each other. I'm ...
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Scriptable FTPS client able to send Keep Alive to control port?

We need a FTP client that satisfies the following constraints: Windows Command-line scriptable, so we can automate it...sorry, FileZilla (?) FTPS, as it seems to perform better than SFTP The ability ...
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1 vote
1 answer
1k views

Is tcp_keepalive application dependant on Linux?

According to http://tldp.org/HOWTO/TCP-Keepalive-HOWTO/index.html , the kernel keepalive function occurs at the OS level, and doesn't require an application to explicitly call it. However I also read ...
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2 votes
1 answer
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Tuning tcp_keepalive_time for Node.js leak

I'm currently having a socket leak with my Node.js application. This bug is also posted here. I hope to fix this soon. CLOSE_WAIT and FIN_WAIT2 seem to be the major problem. Connections: 1662 ...
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4 votes
2 answers
3k views

Is it possible to tell nginx over fastcgi to pass a Connection: close header through unaltered?

TL;DR: How can I tell nginx from my php-fpm backend to a) send a "Connection: close" header and b) to not buffer my response? I have a set up running php-fpm behind nginx. In general, this works very ...
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2 votes
1 answer
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Apache 2.2: RewriteMap, ProxyPass interpolation and Keep-Alive

I have an Apache httpd used as a SSL reverse proxy frontend for a lot of backends. I compute the name of the backend from the path given by the user. e.g: https://myhostname.com/myaccount translates ...
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1 vote
2 answers
5k views

In Nginx can I set Keep-Alive dynamically depending on ssl connection?

I would like to avoid having to repeat all the virtualhost server {} blocks in nginx just to have custom ssl settings that vary slightly from plain http requests. Most ssl directives can be placed ...
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7 votes
2 answers
21k views

How filter only keep-alive packet with tcpdump

I need to analyze a traffic-dump on my network to check if all the PCs have enabled tcp keep-live features. I'm using tcpdump for that purpose. What I need to know is if there is a possibility to ...
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3 votes
1 answer
11k views

Configure keep alive timeout on Jetty 6.1.19

How do you set the timeout on keep alive connections to the Jetty web server (in my case v6.1.19)? I would like to configure how long Jetty keeps connections open when a client requests keep alive. ...
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1 vote
1 answer
261 views

Ubuntu concurrent connections

I'm behind a proxy that is "Enterprise DDoS Protected". On a normal day with normal connections to all my servers the concurrent connections on the proxy is 17,000. Yes 17,000 is normal for the nature ...
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2 answers
3k views

keepAlive in Apache causing apache to reach its max_clients

I have an Apache 2.2 running on ubuntu 11.4 with 16Gb RAM, for image hosting from mobile phones through GPRS,since connection is slow i have enabled keepalive and set time out to 6,**based on average ...
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1 answer
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Is it better to disable Keep-Alive in IIS 7 for high traffic web applications?

The advice below applies to Apache, but it seems generic enough to apply regardless of system. My architecture is 3 web servers behind a load balancer. My IIS servers currently have keep-alive enabled ...
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2 answers
3k views

How to add persistent connection support to a load-balanced HTTP webservice

We are working on an HTTP webservice load-balanced using haproxy. The webservice is accessed via SSL. It is a RESTful HTTP service and simply accepts JSON, does some work, and returns JSON. There is ...
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4 votes
1 answer
4k views

How do I confirm whether a particular Apache configuration directive is set?

How do I dynamically check/list a particular Apache configuration directive? I know that this can be checked manually from httpd.conf file, but is there any other way this can be confirmed/found from ...
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1 vote
2 answers
3k views

Apache Config for High Page View, Long Session Users - KeepAlive and MaxRequest variables

I am currently running a web app that sees several (~15) users logging in once each day, and then leaving the web app open where it automatically refreshes with new content every 5 minutes. Each user ...
2 votes
1 answer
6k views

Keep-Alive header not sent from Tomcat 5.5 http connector?

We're currently using a hardware load balancer, which then goes to Apache and that then goes to Tomcat 5.5 via the AJP connector. We've decided to dump apache for various reasons - In our current ...
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