Too Many Apache Connections

Sep 24, 2007

I currently have a dedicated server with the following specs:

Celeron 2.6ghz
2gb ram
100mbit connection

the cpu load is always under 0.7, and I always have at least 400mb of free ram.

The site takes about 5-10 seconds to load a test page with just a single word on it. When I type netstat -n | grep :80 | wc -l
I get around 1100-1200 connections. I get about 130k page views per day.

My site is about 95% static html, it has about 150 images per page. How can I speed up my site?

Here are my apache httpd.conf settings:
Timeout - 100
KeepAlive - on
KeepAliveTimeout - 12
StartServers - 48
MinSpareServers - 32
MaxSpareServers - 64
MaxClients - 1500
MaxRequestsPerChild - 1000000

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How Many Connections Apache Can Go Up To

Sep 15, 2008

Just logged in my cPanel, and Apache Server Status shows

Parent Server Generation: 7
Server uptime: 2 hours 52 minutes 5 seconds
Total accesses: 701666 - Total Traffic: 63.7 GB
CPU Usage: u1610.22 s255.4 cu0 cs0 - 18.1% CPU load
68 requests/sec - 6.3 MB/second - 95.2 kB/request
400 requests currently being processed, 0 idle workers

I told customer service and said my website (a big forum) have 4000 people now, I felt very slow, could the slowness caused by this max apache connection setting?

I got reply: "400 seems to be as high as Apache can go. Your httpd.conf settings currently show 500 max connections enabled. If Apache is stopping at 400 then this is it's hard limit for maximum connections. Also If it was able to go even higher you would eventually run into memory issues on the server that would cause the server to crash."

Can anyone tells me if "400 requests currently being processed, 0 idle workers " is a problem or could it be the cause of the slowness. I imagin if more people request connection, and apache can't deal with that much, it has to let those request wait in the queue, therefore caused slowness or time-out.

The seem server could deal with 8000 people online before, no any problem at all and speed was quite fast. I don't know what i should do now.

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Max Apache Connections

Jan 19, 2007

is a way to understand whats the bext max apache settings for me?

Maybe to look over httpd-status requests currently being processed and the number of idle servers or the number of strokes?

Or probably the best way is to use some benchmark application but then i am not sure how to test my config?

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Monitoring Apache Connections

Feb 22, 2008

whats the easiest way to monitor the number of apache connections?

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Weird Single IP Uses Up All Apache Connections

Jul 11, 2009

Our web server encounter a problem lately, that an IP address in India repetitively sent requests that uses up all connections available in Apache. All connections appear to be in W state. The connections are not terminated by Apache even though timeout has been set to lower 30 seconds. Similarly, MySQL connections also are not dropped until Apache is restarted.

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Maximum Number Of Apache Connections

Feb 24, 2007

I would like to know what is the maximum number of Apache connections a Server can handle? Does this depends on the Config of the Server? Is it Possible for a server to handle more than 2500 Active Apache connections without timeout / connection failure / slowness?

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Apache Won't Terminate Connections, We're About To Give Up!

Apr 19, 2007

I've got an older "Super Server P4" series server @ ThePlanet - it's been a great box for years. We recently upgraded php4 to php5 and did a mysql upgrade as well. Ever since, randomly, without warning, Apache stops terminating connections, so the max connections fills up, and httpd won't respond. Apache doesn't stop running, it just max's out and stops accepting new connections, so customers assume the server is "down", although email/FTP work fine.

The server never crashes, the loads stay down, but httpd just fills up and won't accept more connections. We can't increase max connections (we actually DECRESED IT), because they'll just keep piling up, never terminating, and then ultimately, it will crash the box.

My admin has worked for nearly 2 weeks trying to figure it out, and Scott (AtomicRocketTurtle) and his team have been evaluating it for about a week - it's happened 3x in 2 days ... last night, httpd quit responding for about 7+ hours and since we didn't have httpd monitoring, we never knew until the office opened this AM and I had two very angry customers. Scott suspects it may be some rogue application that triggers it that didn't affect it prior to the php5/mysql upgrades.

Both Scott and Parm, my admin, have about thrown in the towel and are recommending we retire the server and migrate to a new box.

It's older - much older .. I'm pasting specs below, RHEL3, Plesk 7.5 .. but just wonder, before retiring an old server that was RUNNING GREAT prior to the upgrade, maybe someone has seen this happen before?

If so - PLEASE LET US KNOW before I spend the $$$ on a new box.

Current box's specs:

CPU GenuineIntel, Intel(R) Pentium(R) 4 CPU 2.80GHz
Version psa v7.5.4_build75060118.18 os_RedHat el3
OS Linux 2.4.21-47.0.1.ELsmp
RAM: 1GB, with 2GB swap
apache 1.3.31
bind 9.2.4-20.EL3
coldfusion Component was not installed
coldfusion-support 7.3-2.96.128
courier-imap 3.0.8-rhel3.build75050824.12
drweb 4.32.2-rh7_psa
drweb-qmail 4.32-rhel3.build75050824.12
httpd 2.0.46-61.ent
jdk 1.4.2
logrotate 3.7
mod_perl 1.99_09-10.ent
mod_python 3.0.3-5.ent
perl-Apache-ASP 2.57-rhel3.build75050824.12
phpmyadmin 2.5.3
phppgadmin 2.4.2
postgresql 7.3.6-7
postgresql-server 7.3.18-1
proftpd 1.2.9
psa 7.5.4-rhel3.build75050824.12
psa-agent 1.3.2-2_psa7.1
psa-api-rpc 7.5.4-rhel3.build75050930.11
psa-bu 7.5.4-rhel3.build75050926.17
psa-horde 3.0.5-rhel3.build75050824.12
psa-imp 4.0.3-rhel3.build75050824.12
psa-logrotate 3.7-rhel3.build75050824.12
psa-manual-custom-skin-guide 7.5.4-rhel3.build75050824.12
psa-migration-manager 7.5.4-rhel3.build75050930.11
psa-proftpd 1.2.10-rhel3.build75050824.12
psa-qmail 1.03-rhel3.build75050824.12
psa-qmail-rblsmtpd 0.70-rhel3.build75050824.12
psa-spamassassin Component was not installed
psa-tomcat-configurator 7.5.4-rhel3.build75050824.12
psa-turba 2.0.3-rhel3.build75050926.17
qmail 1.03
rblsmtpd 0.70
samba 3.0.9-1.3E.12
spamassassin 3.1.3-1
SSHTerm 0.2.2-rhel3.build75050824.12
stunnel 4.04-4
tomcat 4.1.24-full.2jpp
webalizer 2.01_10-15.ent

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How To Set Max Number Of Connections In Apache (on Windows 7)

Apr 11, 2013

I am trying to figure out how Apache is working on windows 7 - so far so good - but how do I set restrictions and limitations on bandwidth usage and max number of IP-connections?

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Apache :: TCP Connections Getting Restarted (2.4.6-x86 Server)

Oct 29, 2013

Webserver is restarted all TCP connections randomly. we are not able to get any error into errorlog file.

Webserver close all TCP connection and start created new TCP connection for new request.

AcceptFilter http none
AcceptFilter https none

Also, conf file is saying that
Defaults Values are:
EnableMMAP On
EnableSendfile Off

Not sure what's wrong with server.

We have installed "Apache 2.4.6-x86 server" on Win 2008 R2 Standard server (64-Bit).

Also, we are using mod_jk module for connecting to tomcat server "".

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Check Which Account Apache Max Out The Number Of Connections

Nov 13, 2008

I am facing to this trouble: apache max out the number of connections. When viewing status, all I get here


SrvPIDAccMCPU SSReqConnChildSlotClientVHostRequest
0-028240/6/65R 0.1414290.00.020.32 ??..reading..
1-028170/17/65R 0.111510.00.030.22 ??..reading..
2-028350/3/57R 0.20112210.00.000.24 ??..reading..
3-027570/33/62R 1.431412930.00.130.21 ??..reading..
4-026430/75/75R 2.12153190.00.310.31 ??..reading..
5-026440/52/52R 2.061610.00.240.24 ??..reading..
6-028180/13/60R 0.621600.00.070.22 ??..reading..
7-026490/63/63R 2.84143070.00.370.37 ??..reading..
8-028190/7/43R 0.271610.00.020.27 ??..reading..
9-028080/27/76R 0.361410.00.040.29 ??..reading..
10-026750/50/52R 2.9617630.00.260.26 ??..reading..
11-027720/23/49R 3.641600.00.100.19 ??..reading..
12-026620/64/64R 2.201520.00.290.29 ??..reading..
13-027730/25/64R 1.121500.00.140.19 ??..reading..

which account on server is the reason please? I am on CentOS box with DirectAdmin.

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Rule To Limit Apache (port 80) Connections From 1 IP To 15

Apr 12, 2007

any good rule to limit Apache (port 80) connections from 1 IP to 15 with iptables/csf?

And total connections to the box to 100?

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DOS Attack Over Apache, Full Of READING Connections

Feb 5, 2007

As you can see my apache is full of Reading connections..... they are filling up my server dening legitimate users to browse trought the websites hosted there... I think this is what is happening to me:

Im using apache on RHES 3 with latest patches and kernel.

930 requests currently being processed, 6 idle servers

1-044940/40/40R 0.33340.00.060.06 ??..reading..
2-044950/55/55R 0.47330.00.110.11 ??..reading..
3-044960/35/35R 0.31330.00.050.05 ??..reading..
4-044970/38/38R 0.13210.00.090.09 ??..reading..
5-045410/40/40R 0.16360.00.130.13 ??..reading..
6-046190/28/28R 0.12110.00.030.03 ??..reading..
7-046220/34/34R 0.35320.00.100.10 ??..reading..
8-051640/34/34R 0.135100.00.300.30 ??..reading..

Also, here is the top output of the top command:

top - 12:46:21 up 10 min, 1 user, load average: 1.40, 2.03, 1.06
Tasks: 1063 total, 2 running, 1060 sleeping, 0 stopped, 1 zombie
Cpu(s): 4.9% us, 1.6% sy, 0.0% ni, 93.1% id, 0.3% wa, 0.0% hi, 0.0% si
Mem: 2073516k total, 2001984k used, 71532k free, 42384k buffers
Swap: 2048276k total, 0k used, 2048276k free, 178096k cached

Server seems to be fine, but total tasks are always between 1060 and 1124... thats very rare too..

how to avoid this attack?

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Limit Apache (thread) Connections Per Request

Jan 9, 2007

I've been having trouble the past few days with someone who's been "attacking" my site so to speak by continuously downloading very large files with as many connections as (he) can open. I operate a large downloads site for computer games, this person has selected the largest files (like 400-500MB). Not sure of the real intent other than to clog up my bandwidth capacity. Also he appears to be using proxies since as soon as I ban one, another shows up seeminly from China.

Anyway, I have mod_bw and I've limited the number of connections in the downloads area to 2. While that works ok, his tool uses threads like a download manager would and he's using up 30-40 child threads for his 2 file downloads.

So 2 questions,

Is there anyway to not only limit file downloads to 2, but limit the number of connections per request? Many of my visitors do use download managers and I'd like for them to continue using them but use a reasonable number of threads like 6 or 8, but not 30.

Also, is there a way to restrict access to someone using a proxy?

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Apr 7, 2014

I am interested to know number of current connections in my Apache server
Server version: Apache/2.2.15 (UNIX)
OS : Solaris 5.10

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How Do I Fix "excessive Apache Connections"

May 2, 2008

I just received an email saying

We were forced to suspend your account due to excessive apache connections causing ftp to go down. Here is a snapshot of the activity:

242-0 22189 0/57/57 W 1.24 10 0 0.0 0.09 0.09 xxxxxx
243-0 22194 0/1/1 W 0.01 0 0 0.0 0.00 0.00 xxxxxxx GET
244-0 22214 0/4/4 W 0.15 4 0 0.0 0.03 0.03 xxxxxx GET
And when I was on the phone with the support, they told me my site had opened up 400 apache connections + using the GET command and was causing FTP slow downs.

It just happens so that a file I posted made its way to a popular forum and all the sudden, everyone was downloading the file.

What is the best way to correct this problem? and GET? Isn't that a FTP Command? but people were downloading via [url]

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Dec 22, 2008

Sometimes my server surcharge load average increase at 60 , and all my configuration are OK

when i type :

netstat -plan|grep :80|awk {'print $5'}|cut -d: -f 1|sort|uniq -c|sort -nk 1
i have : ...

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Dec 21, 2008

I tried to update a plugin at my blog its a wordpress blog, as soon as the update was started that site on the server stopped working, (later on i closed the upgradation window), after few minutes website start working automatically, Now in my opinion I think that update process is still running in background thats why connections are creating continuously to that website IP.

[root@server ~]# netstat -alpn | grep :80 | awk '{print $4}' | cut -d: -f1 |sort |uniq -c
1001 serverIPhere
its even touching 1500, I tried to contact my server support but unfortunately they can investigate the issue, instead they told me to check with the following command.

netstat -plan |grep :80 | awk '{print $5}' | cut -d: -f1 | sort | uniq -c

which is not an answer to my question. Can anybody please tell me why those connections are making to that website's IP? I don't think its a Ddos attack, because it was just started when i updated the plugin.

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May 19, 2008

Could someone comment on the kind of load a VPS service can handle? If I were to run an HTTP server how many connection/sec would be realistic.

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Mar 6, 2007

How many simulteanous connections to the site do alot of webhosting company usually allow with shared hosting packages. I was wondering because4 some companies say pay $$ a month get 300gb of bandwith a month. Can they limit the bandwith by limiting your simulteanous connections? I am asking because I just found out my host only allows 50 per hosting package that is on a shared server. To me that seems to be very little.

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DNS Tcp Connections

Apr 19, 2007

WARNING: One or more of your DNS servers does not accept TCP connections. Although rarely used, TCP connections are occasionally used instead of UDP connections. When firewalls block the TCP DNS connections, it can cause hard-to-diagnose problems. The problem servers are:

Error [No response to TCP packets].

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How Many Connections Per IP Is Too Many

Dec 20, 2007

I run this a few times a day:

netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n

and get outputs like (just the bottom here, IPs removed):

8 IP #1
8 IP #2
8 . . .etc

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DDoS deflate is installed: [url]

which permabans IPs with 150+ connections

Also what are the commands to block and unblock these IPs,

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Oct 29, 2008

Firewall TCP Out Connections

My server started lagging up and I processed my configserver firewall logs and founds tons of TCP out connections. How can I track down which user was making these connections, if possible?

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Apr 21, 2009

i have a vps, and im current use lighttpd, but i want move to litespeed Standard. And i see they limit Max Concurrent Connections =150 on standard version.

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May 6, 2009

Has anyone worked with the cable companies on internet connections for hosting? Eg. Comcast, TW.

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It also included a dedicated line to our offices. Would using a cable line be a bad idea for a hosting connection?

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Mar 16, 2008

Most of them are from Google and Yahoo...

Server is being heavily loaded beause of this.

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May 2, 2008

I signed up for a hosted account with gator and I don't understand something. They tell me it's a policy change for security reasons but the simultaneous SSH connections has been limited to 2. That's just nuts. Is there a real reason why someone would limit this? i need two for editors, one for shell and one for mysql. Minimum of 4. What security concern could cause them to pick 2 as the number?

I just don't get it.

Here's what they said to me.

info: Please wait for a HostGator operator to respond.

Channel Sanderson: Hi. We're working on our website and have run into a small snag. It seems we can only have two open SSH connections at a time this week. We were able to open more a couple weeks ago. Is this something that you can change?

Kella J.: Ok, the issue is.. You are only alllowed 2, no matter what..
Channel Sanderson: I believe we are not understanding each other. We're not trying to connect 10 times in a minute. We just need more connections. 2 is insufficient. We need a minimum of 4 simultaneous connections to our server.

Kella J.: I am sorry, I checked with my admin.. he said there is only a limit of 2, period..

Channel Sanderson: This is an unnecessary limitation in my view and badly limits my ability to do what I need to do.

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Jun 20, 2008

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May 15, 2008

How can I Limit connections per IP in IIS6?

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Apr 2, 2008

my server always have problem about the mysql connection:

Discuz! info: Can not connect to MySQL server

Time: 2004-5-14 8:55am
Script: /index.php

Error: Too many connections
Errno.: 1040

Similar error report has beed dispatched to administrator before.

i find the solution:

add "set-variable = max_connections=1000" in my.cnf file

but didnt find the file my.cnf,my control panel is directadmin,

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Jan 16, 2008

My PHP application is starting to reach max mysql server user connections limit (currently set to 60). I listed mysql process list in phpmyadmin and found there lot of queries with status "LOCKED" these hang there for a long time(not always just sometimes - twice a day) and then connection limit is reached. It causes load average about 40 for as long as 10 - 20 minutes

I think it may be bacause of query structure. There are some queries with many inner joins...

Here is typical situation from phpmyadmin's process list:

1. select ... from table_1
inner join table_2
inner join table_3
inner join table_4
inner join table_5
This show status : "Copying to tmp table" in phpmyadmin

2. update table_2 set ....

This shows status: Locked

3. select ... from table_2

This shows status: Locked

Seems then when temp table is being created the table_2 is locked and it cannot make update to table_2. or maybe it's locked because of just that update on table_2.

I want to avoid of creating temp tables... Can it help if I'll make separate selects without large table joins ?

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Jan 7, 2007

My site is hosted on Dreamhost and gets over 1 million hits a day. The site is highly optimized, so it can handle the load easily without slowing the server down. Most pages have a loading time of under 0.2 seconds.

However, Dreamhost is telling me now that I'm using up too many "connections" and have limited my connections to 150 every 3 seconds (or so they say). Now 503 errors are coming up left and right, and its highly annoying to me and my users. Oh, and Dreamhost has mentioned several times that I'm oh such a very good candidate to upgrade to $400/mo dedicated hosting (from $8/mo currently).

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