Mysql Persistent Connection

Nov 3, 2009

Currently mysql.max_persistent and mysql.max_links are set to -1 which means unlimited

to optimize mysql, should i keep this unlimited or is it good to limit this? If i have to limit it, what is the best value that I can put there?

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Dealing With A Persistent Hacker

Aug 25, 2007

I was checking my business server's IIS errors logs when I ran across the following error:

2007-05-19 08:21:10 2243 80 HTTP/1.1 GET

/ 400 - Hostname -

Additional information about the those responsible for the hack attempts are as follows

(retrieved from

CustName: ----------------(hidden by me)
Address: Private Address
City: Plano
StateProv: TX
PostalCode: 75075
Country: US
RegDate: 2005-08-27
Updated: 2005-08-27

Apparently this person was trying to use the dfind hacker tool to find vulnerabilities on my server. The IP address belongs to AT&T Yahoo; and I've already contacted them by email. I believe that subsequent hack attempts have originated from this IP, however, the IP address has been masked by the use of proxies. I think that this may be someone I know because the IP is only about an hours drive from me. I'm starting to suspect a disgruntled former client who has friends living where that IP's from.

Has anyone here had any similar experiences?

What do you think AT&T Yahoo's response will be?

Is there anything else I can do or should not do?

I am also considering reimaging my server because of system issues but I am concerned that would erase any information needed for investigative purposes. I have saved my log files, though, on a CD but I'm thinking that AT&T Yahoo or whoever investigates this needs the server as it is.

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Plesk 12.x / Linux :: Persistent Editing Of Postfix Files

Dec 10, 2014

I want to put custom values in /etc/postfix/, but I'm afraid plesk would overwrite them during upgrade. How can I safely add custom values to and preserve them duing plesk updates?

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MySQL Connection

Jun 8, 2007

I have a database server – which is the main MySQL server in H-Sphere.

I've created a database from mysqladmin interface.

I can use the database without a problem but when I’m trying to access the database from another server that I’ve just installed, the PHP application says that it can not connect to the database.

Another thing is that if I move the php app with the same configuration file under a shared account under another H-Sphere server, it's working perfectly.

I’ve read the H-Sphere documentation about an option to enable remote access to the mysql server which I can’t find anymore under our H-Sphere 2.5 Patch 8.

I’ve done a lot of searching to see how can I make that PHP application to connect to but it seems that although I’ve run the command grant all …. Command for that database, it still doesn’t work.

One final thing – from that new server if I run "mysql –h –u user –p" I can connect to the database and do a use database, show tables etc.

From iptables on I see that it accepts connections from outside.

This issue of not getting that PHP application to connect to can be related to the fact that H-Sphere is using the server or what should I try further?

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MySQL Connection Fluctuates

Oct 1, 2009

I'm trying to diagnose where my problem is coming from.

I have a site hosted with Integra Telecom. The site is connecting remotely to a MySQL database hosted on Media Temple.

My problem is that the site's connection to the MySQL database seems to be fluctuating throughout the day. Sometimes the site is up, sometimes it's down.

When it was down, I got the error: "Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)"

So is the problem with Integra Telecom or is my problem with Media Temple?

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Windows - MySQL Too Many Connection..

Jul 15, 2008

I have win2003 server and running plesk 8.4, there is a website on it and it gives me error with mysql max_connection even I set the limit 1 million or 10000 no matters.

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Mar 18, 2008

We have a front end server for the website (a free web hosting community), a mysql server and a main server for hosted websites. The problem lies between establishing a connection from the server to the database server - to sum it up, the connection just "hangs". We have never had this problem before, never edited anything which would cause a problem, its completely spontaneous.

My administrator has spent endless hours trying to debug the problem, here are some notes he gave me:

1. Ping to the mysql machine works fine.

2. Telnet to port 3306 of the mysql machine works great too – meaning NOT a network issue.

3. Strace on the connection shows it hangs when it calls the server and waits endlessly for response.

4. The mysql machine listens to the IP and port 3306 and connects great to the hosting server via SSH.

5. It's NOT a max connection issue but something to do with the mysql socket itself.

Here is a test from another site on the server to the mysql server:

mysql_connect('', 'wkscript', 'PASSWORD') or die(mysql_error());
mysql_select_db('domains_data') or die('SELECT ERROR : ' . mysql_error());

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LiteSpeed - Connection To Mysql

Dec 21, 2008

I have setup LiteSpeed and I have got a problem with php and mysql.

It seems php can't connect to mysql. At every script which use mysql(like phpbb3, phpbb2 etc) I getting errors

SQL ERROR [ mysql4 ] Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2) [2002]
phpBB : Critical Error
Could not connect to the database

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Lost Connection To MySQL

Dec 7, 2007

MySQL Error : Lost connection to MySQL server during query

I get this error around 10 times a day and the MySQL server goes down

Here are my.cnf contents


back_log = 75
max_connections = 650
key_buffer = 48M
myisam_sort_buffer_size = 64M
join_buffer_size = 1M
read_buffer_size = 1M
sort_buffer_size = 2M
table_cache = 3000
thread_cache_size = 128
wait_timeout = 90
connect_timeout = 10
tmp_table_size = 64M
max_heap_table_size = 64M
max_allowed_packet = 64M
net_buffer_length = 16384
max_connect_errors = 10
thread_concurrency = 4
read_rnd_buffer_size = 786432
bulk_insert_buffer_size = 8M
query_cache_limit = 3M
query_cache_size = 48M
query_cache_type = 1
query_prealloc_size = 262144
query_alloc_block_size = 65536
transaction_alloc_block_size = 8192
transaction_prealloc_size = 4096
default-storage-engine = MyISAM

nice = -5
open_files_limit = 8192

max_allowed_packet = 16M
key_buffer = 64M
sort_buffer = 64M
read_buffer = 16M
write_buffer = 16M


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Max MySQL Connection On Shared Host

May 31, 2009

What is the standard number on maximum mysql connection on most shared host providers and which one give the highest number.

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Remove Server MySQL Connection

May 13, 2009

I bought a VPS to run a part of a application I have and it needs to connect to my database in cpanel. I have set everything up properly and allowed the remote server to connect to my server, I updated the DB connect file with the correct mysql server username and password. But when I try and run the script I get this error.


Client does not support authentication protocol requested by server; consider upgrading MySQL client in

I'm not 100% sure what to do. I don't understand why it wouldn't work because it works perfectly on the main server with my scripts. But I get that error message on the remote server.

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Host For Remote MySQL Connection

Feb 21, 2008

I have developed a desktop system that uses MySQL data.

I want to use a host to access the data but my current provider only allows access to MySQL data via a web server.

Can anyone suggest a host that would provide direct connection to a MySQL database?

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Allow User To Remote Mysql Connection

Aug 15, 2008

how to allow user to remote mysql connection from his localhost ( in linux server with WHM )

my user wants to connect to the mysql from his localhost

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Lost Connection To Mysql Server During Query

Aug 12, 2007

some vBulletin customers facing to that error message, with session table with attachment only. Other just work fine. It's not because of server load. The load is just around 0 - 0.1

I have increased wait_timeout to 200 and max_allowed_packet to 64MB. Each attachment file in those vBulletin is just around 1-3MB.

Is there any idea why and how to fix?

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Cpanel Mysql Remote Connection USE EXIST DB

Jun 29, 2009

A have set up a cpanel with remote mysql server.

My demo config:


centos VPS with cpanel WHM (demo)


debian VPS

the configuration is OK, it works.

We have got 200 customers, and we will to change to cpanel.

The MYSQL server is on a solaris zone. It is possible to make the remote connecting with it. I will import the 200 users MYSQL databases to cpanel, with privileges (user settings). The mail/web dir a will import manuali to cpanel server(copy-paste-setuser:group).

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Connection To MySQL Hangs 2-3 Times/hour

Jan 10, 2007

I just got a new server and discoverd very strange problem. It happends 2-3 times every hour. When I try to access some webpage which connects to MySQL, I get page header and then page hangs for some 1 minute. After some 1 minute everything is back to normal. I can open several windows with different websites hosted on my server and the same problem is in all windows. At the same time I can access al websites without MySQL connections.

I have Fedora Core5
MySQL version 5.0.27

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MySQL Remote Connection Problem After A Heavy Usage

Aug 8, 2008

I have 2 identical Fedora8 boxes with Apache 2.2.8, MySQL 5.0.45 and PhP 5.2.4. I use one as the Web+DB server (say box A), and the other (box B) just as the Web server connecting to the DB server on box A. I use this 2 machine configuration to test a LAMP based-Web application. I have a client program on other machines that can emulate a massive web workload to these 2 servers; it can emulate hundreds to thousands of users using the application simultaneously.

Before running the test, the connection to the DB server from both boxes seem fine. Using the mysql client program on either box A or B trying to connect to the DB, the connection goes through instantly. In the /etc/my.cnf file, I have max_connections=4096 and max_user_connections=4096. Note that the web app uses one single db user to connect to the db. To allow remote connection, I inserted one record into the user table of the mysql db whose the host field's value is '%' (allow connection from all remote hosts).

After running the test (which I found out that many requests sent to box B failed), mysql client program on box A is still able to connect to the db instantly; but the one on box B has a problem: it takes extremely long (5 - 10 minutes or even more) to establish the connection, it doesn't time out, just takes that long. I believe that's the cause for the failure of requests to box B.

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Bastille Firewall Causing Mysql Connection Errors

Jan 27, 2008

The main function of my dedicated server is the vBulletin forum that we run.

Ever since I had bastille firewall installed and configured on my server we have been getting regular vBulletin errors.

Everything runs pretty smoothly most of the time, we can carry lots of connections without any issues, server has plenty of free RAM and CPU is never overloaded even during peak hours. I have been told bastille firewall (iptables) is configured correctly, all ports that need to be open are open.

But about twice per day we have a MySQL "disconnect" that lasts about 30-60 seconds per incident. For example we will start getting the following message via e-mail, and it will amount to 20-30 e-mails like this during the 30-60 second incident. After that, the e-mails and problems will go away, until next time.

vBulletin Database Error!
mysql_connect(): Can't connect to MySQL server on '' (4)
/hsphere/local/home/site/ on line 274
MySQL Error :
Error Number :
Date : Saturday, January 26th 2008 @ 07:53:05 PM
Script : [url]
Referrer : [url]
IP Address :
Username :
Classname : vb_database

The server is running CentOS 4.6, PHP 4.4.7, MySQL 5.0.45. The vBulletin software has been patched to the latest version. The vBulletin people are not sure why this could be happening.

Well we never believed that the firewall was causing the issue BUT it only started happening on the day the new firewall was installed. So we tried stopping the firewall for a full week and the MySQL database errors stopped happening, completely. So I'm convinced the problem is the firewall blocking MySQL connections but I can't figure out why?

There are no entries in the MySQL .err logs pertaining to this. Can't figure this out, any help or ideas is appreciated since the people who installed the firewall are not sure either.

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Plesk 12.x / Linux :: Enable To Create New MySQL Database Server - Test Connection Failed

May 7, 2015

I freshly installed Plesk 12.0 on Ubuntu 14.04. Everything works accept the MySQL database creation.

When I try to create one, i get this error :

error: the test connection to the database server has failed because of network problems: connection refused...

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Pure-ftp :: 425 Could Not Open Data Connection To Port 2535: Connection Timed Out

Apr 7, 2008

I have ftp server (pure-ftp). with firewall.

i allowed 20 and 21 port in "CSF" firewall

now when i or our client connect to the server connection done.

and the they fire dir or ls command they will receive error

"425 Could not open data connection to port 2535: Connection timed out"

what is the problem.i have already allowed passive port 2500:3500 then why i received this types of error

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I Moved Mysql From /var To /backup/mysql, Mysql Is No Longer Working

May 8, 2009

Since my /var partition is full, so I moved /var/lib/mysql to /backup/mysql/.

Seems all the files are copied and I changed my.cnf reboot mysql, but all the web sites using db is not working anymore..

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Installed MySQL In /usr/local/mysql But Error In /var/lib/mysql

Jan 21, 2007

I installed the MySQL binary packages in /usr/local/mysql/ after removing the MySQL RPM package. MySQL is functioning when I executed /usr/local/mysql/bin/safe_mysqld. I reinstalled MySQL before I installed PHP. When I used a PHP script to access a MySQL database, it outputs an error:

Warning: mysqli::mysqli() [function.mysqli-mysqli]: (HY000/2002): can't connect to local mysql server through socket /var/lib/mysql/mysql.sock in index.php on line 2
However, I installed MySQL in /usr/local/mysql, not in /var/lib/mysql. How do I fix MySQL?

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Connection- VPS

May 14, 2008

i do a tracert on my VPS and get the attached results. My location is South Africa. Lately it just seems a bit sluggish. Can somebody please do a tracert from USA and EU for me please to do a comparisons or advice me on this VPS

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How Many Connection Per IP

Jan 6, 2007

I am on a VPS server and want to know in high traffic conditions how many connections per IP address can come... because on my site connections per IP going to 300 and mostly around 100.

But these are fluctuating and from different locations... everytime.. so dont think as a Dos but so many connections per IP makes my server down for few minutes until connections dont go down.

how many maximum connections per IP will be fine... for a little popular site.

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One Connection Per IP

Dec 11, 2007

I have a directory, named downloads/

I have some huge files for download in this directory.

now, when our users trying to download files from this folder with flashget (or dap or ...) this programs create 5 connection to that files! so If a user trying to download 5 files , he have 25 connection to my server!

How can I limit connection per Ip on file in this folder ?

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Too Many Connection From Yum

Dec 18, 2007

Today i get alert from server provider saying my server is under attack, i check netstat and found too many connections.


This ticket was automatically generated by the Softlayer Network Protection System. Due to the large amount of traffic targeted to your IP address, SoftLayer has automatically injected the IP address into our Cisco Guard Protection system. This system diverts traffic destined to the IP address through hardware devices that will try to identify and block the specific packets and flows responsible for the attack while allowing legitimate transactions to pass. The injection of will remain in place until this attack subsides and then be automatically removed once traffic levels reach a normal level.

Details of the event follow:
Exceeded Bits In: 782.7 M (Threshold: 500 M)


The connections are from my server to port 80 of "".

lsof -i :port gives

PHP Code:

# lsof -i :47837
crond     16004 root  269u  IPv4 48880489       TCP> (CLOSE_WAIT)
udevd     31116 root  269u  IPv4 48880489       TCP> (CLOSE_WAIT)
yum-updat 31347 root  269u  IPv4 48880489       TCP> (CLOSE_WAIT)
auditd    31683 root  269u  IPv4 48880489       TCP> (CLOSE_WAIT)
python    31685 root  269u  IPv4 48880489       TCP> (CLOSE_WAIT)
ntpd      31715  ntp  269u  IPv4 48880489       TCP> (CLOSE_WAIT)

I have rebooted the server and now server is normal.

I disabled yum on the server. Some days back, i have same problem with another server, server have too many connection to one of the yum respositry IP. The OS is CentOS 5.1

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DNS Connection

Jun 7, 2007

This is an error that dns report spat out to me. I have the firewall disabled as of now so I don't understand why packets would be blocked..if they are being blocked. From what I can tell, I can get to the server and resolve no problem...but could that stop other dns servers from connecting to it? I recently moved my cpanel box to another location in the LT datacenter in order to get on a different subnet - the previous one was a spam list nightmare. All IP's have been changed over and this just cached from like the 14 hours I was down (ouch!) or is this still happening? I mean...its able to look up a records and it can get the mx servers...

error: Our local DNS server was unable to get your MX record. This usually means that a firewall in front of your DNS server is interfering. For example, it may be blocking DNS packets from low source port numbers (ours is often in the 1024-1030 range). Firewalls should never block DNS queries based on the source IP address; otherwise, it is guaranteed that legitimate queries will be blocked. This specific lookup must be cached, so a recent change may not be reflected.

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FTP Connection

May 28, 2007

I have a Linux box running CPanel and am having issues with 1 particular client trying to connect using FTP. I am also running lfd and csf.

The problem is that whenever they try to ftp to the server (regardless of the domain), they get an error saying:

"Connection to host lost".

I look through the logs (/var/log/messages) and see that there was a connection made and closed. No errors.

Otherwise, all my clients can connect without a problem.

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Mysql.sock Gone And Mysql Restart Doesn't Create It

Jun 16, 2008

For some reason mysql wont start, i have tried restarting mysql but it wont, it says FAILED. The mysql.sock file seems to have disappeared and i cannot find it anywhere.

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How To Restore Mysql Databases From /var/lib/mysql/user_database/ Files Only

Feb 11, 2008

I recently had a harddrive failure and luckliy I can still access certain directories on this failed drive. I can still access the /var/lib/mysql/ directory which holds all the users databases and have backed all these up separately using tar.

Now what I need to know is how do you restore these database files to another server? I tried simply untar'ing one of these to the new servers /var/lib/mysql/ direcotry and it stuffed Mysql up - it went offline. I had to get a cpanel tech to bring Mysql back online.

how can I get these database files to fully work on a new server?

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