My Server Is Currently Under Attack

Jul 2, 2009

My server is currently underattack, I have been able to keep it up but after I ban 500 IPs, I get a lot of different IPs again.

Any idea or suggestion to do mass-ban to those attacking IPs?

tcp 0 0 xxx.xx.xxx.xxx:80 190.87.128.59:3965 SYN_RECV
tcp 0 0 xxx.xx.xxx.xxx:80 82.115.52.10:2323 SYN_RECV
tcp 0 0 xxx.xx.xxx.xxx:80 90.148.137.56:21094 SYN_RECV
tcp 0 0 xxx.xx.xxx.xxx:80 189.237.35.155:57605 ...

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DDOS :: Someone Is Trying To Attack Our Server

Jul 4, 2006

Someone is trying to attack our server (I think so). When running apache status there are a LOT of connections from one network, all requesting the same page. But running: netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n does show any of these IP's. So script blocking ddos attacks wont work. Anyone know what can I do about this?

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How Many Attack Attempts Do You Get To Your Server Per Day?

Aug 22, 2007

I went today to my apache error log, and noticed that those scum lowlifes hackers trying to hack my server every day for at least 100 times!!!

What a disaster!

Examples of urls they trying to use:
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- http://uploaded.justfree.com/id.txt?
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Is there anything that can be done to prevent this mor*** from even trying to hack (except putting a bullet in his/their head)?

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Feb 2, 2008

is this DDOs attack : .....

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Jan 31, 2008

I think I'm experiencing some type of alternative to a DDoS attack. My server is being killed by thousands of emails being sent to fake accounts on my server.

I'm not a server administrator, so please bear with me.

My load average is skyrocking to 800.xx at times. I look at "top" and see "exim" for one specific user on my server. I own all the websites on my server, by the way.

When I look at my email queue, I see thousands of emails coming in to accounts that don't exist for that specific user. Let's say the domain name is salcollaziano.com. Somebody is sending spam to various salcollaziano.com aliases that don't exist. Like webmaster -at- salcollaziano.com and suzy -at- salcollaziano.com.

How can I prevent these spam emails from having any interaction with my server? It's causing me a lot of downtime on all the sites I have running on that particular server.

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Aug 8, 2007

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Nov 17, 2007

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I've checked netstat and I notice a lot of SYN_RECV. Could this be a DoS attack? If so, what steps do I take to stop it?

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Softlayer, My Server Is Under Ddos Attack

Jun 18, 2008

my server is being ddosed and the network utilisation is at 40% of 1gpbs

i asked to softlayer to check and they said my programs/services is taking that much bandwidth

any1 can help me?

if my server is under dos attack wat can i do?

because the bandwidth used is about 50gb/hr

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Jul 7, 2009

My server was hit with flood recently, to the point where I was unable to log in via SSH. Running 'netstat' command showed I was getting flooded with thousands of http requests from China/Saudi Arabia/Korea. I installed APF firewall and added those countries to deny list.

Next day I was hit from Russia and Romania and some others. By reading some posts on this site, on top of APF, I have also installed Dos Deflate. It was working for couple of hours, but then it stopped working. I could not even log in via SSH. My provider told me that APF was using all of the "conntrack" connections. I have increased conntrack connections to 130,000 (I have 4 Gigs of RAM on my server). Is that possible? (I have about 300 IP ranges in my APF deny list).

Next day, I was got hit by different attack: there was 11 Mbps of malicious traffic on average sent to my server. My provider put me behind firewall to mitigate against that kind of attack.

Currently, I am both behind the hardware firewall and I have APF and Dos Deflate running. However my server is not accessible.

When I request, I can log in for couple of minutes, but then I get kicked out.

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Ddos Attack Still Dropping My Server

Feb 16, 2008

I have been getting ddossed for the last month, my host has tried many things on my server that are commonly suggested around here, however we have over 40 000 connections hitting the server from this attack and it keeps rising.

I am on LiteSpeed.
I also have NetScreen 50 firewall which helped for a little while, however the server still keeps going down.

I am spending $420 a month on my hosting for my dedicated server
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basically I need some options as to what I can do. I would like to stay with my host, they have been good to me, however if my options are better suited to changing then let me know. I just really need to get my server running great asap and to keep it running great when i'm away from the internet.

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Jun 25, 2008

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Feb 23, 2007

OS: Centos 4

Someone managed to get into my server and launched a DoS attack on someone else machine.

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How do I find out how the person got in in the first place?

How do I make sure that it cannot happen again using the same method?

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How To Stop Further Attack And Further Compramisation Of Server

Jan 10, 2007

Today my system which is hosting the site bepenfriends got compramised(win 2k3) and now LT tech guys are working on it to reload the system with a data save. I was not having a hardware firewall which caused this problem. But i had windows firewall, windows malinious software removal tool (defender i haven't installed). I have updated all patches of win2k3 whch was released till today.

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Now please help me out in below stuff.

How to stop further attack and further compramisation of server.

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Feb 19, 2007

My site is being attacked by what appears to be a dictionary attack on my mail account. They are sending e-mails to random accounts at my domain from random e-mail accounts from somewhere else. Each of their messages is coming from a unique e-mail address and a unique IP address.

Now, we have some dictionary ACL installed that basically blocks any IP address that is caught doing this. So we are blocking tons of IP addresses, but they keep coming at us with new ones. We also have it setup so that the mail is rejected right away for any accounts that arenít actual e-mail accounts of yours. However, they are hitting the server so hard that it doesnít seem to be making any difference.

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Jan 6, 2009

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Jun 18, 2008

Ever since Monday morning, my site has had problems because the server at my host is under attack.

Most of Monday my site was down. Then Monday late afternoon, it came back...I thought. The forum is up and running, but the rest of the site, built on WordPress, is screwy.

Most of the plugins aren't working because of inability to connect with the database.

I can't log in to my cPanel at all and haven't been able to since Sunday.

This is the first time I've experienced anything like this, lasting this long.

It has me wondering if I should start considering a new host. I have loved their service, especially their speedy support (native English speaking to boot) so I hate to leave but I'm not sure if their service is going a little downhill or not.

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DDOS Attack Kill Only Apache Server

Jan 11, 2007

I have a question related DDOS attack. My hosting provider told me that my Server was DDos attacked few days ago. But in those days my server worked fine only apache server was down. The strange fact is that in the same day with this "DDOS attack" one of theyr admins worked something on SSL section of my server and during this operation the SSL hosts were down and httpd worked slow.

Inthe passed 3 months httpd worked very slow and after 2-3 restarts of httpd service the load droped down below 3.00 . I believe theyr httpd service was already with problems and that SSL configuration cause that apache failure in that day with "ddos attack"

I repeat in that day ONLY ssl hosts worked fine and non SSL hosts were down.

It's possibile on DDOS attack that load to be unde 0.5 , SSL hosts to work fine, FTP, Mail and other stuf to work like there is nobody on server (VERY FAST)?

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Attack From A Botnet On My Root Server, With The Same Referer

Sep 22, 2007

on one my root server runs a DDOS attack, apparently from a Botnet, however all have the same Referer. Who can give me Tipps, how I can prevent the attacks? Preferably evenly stop over the Referer?

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Is This A DOS Attack?

Mar 11, 2008

Quote:




Mar 10 20:17:55 host kernel: printk: 102 messages suppressed.
Mar 10 20:17:56 host kernel: printk: 3 messages suppressed.
Mar 10 20:18:01 host kernel: printk: 98 messages suppressed.
Mar 10 20:18:35 host kernel: printk: 34 messages suppressed.
Mar 10 20:18:51 host kernel: printk: 189 messages suppressed.
Mar 10 20:18:56 host kernel: printk: 195 messages suppressed.
Mar 10 20:19:02 host kernel: printk: 249 messages suppressed.
Mar 10 20:19:06 host kernel: printk: 36 messages suppressed.
Mar 10 20:19:21 host kernel: printk: 3 messages suppressed.
Mar 10 20:19:26 host kernel: printk: 342 messages suppressed.
Mar 10 20:19:31 host kernel: printk: 509 messages suppressed.
Mar 10 20:19:47 host kernel: printk: 54 messages suppressed.
Mar 10 20:19:51 host kernel: printk: 421 messages suppressed.
Mar 10 20:19:56 host kernel: printk: 542 messages suppressed.
Mar 10 20:20:01 host kernel: printk: 785 messages suppressed.
Mar 10 20:20:16 host kernel: printk: 340 messages suppressed.
Mar 10 20:20:21 host kernel: printk: 337 messages suppressed.
Mar 10 20:20:26 host kernel: printk: 430 messages suppressed.




Or is this something else? It's been going on for about 40 minutes. I seen my load jump to 20, to 100 and back and fourth

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Under Attack

May 24, 2009

I'm sure that i have Trojans and Viruses on my Server but every time i contacted My Company they ask me to pay money and then they will check and scan my server

so is it any Free application which can scan and remove all bad files on my Server? i'm looking for free applications to scan the whole server

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SSH Attack

Jul 18, 2009

My server stop responding, I couldn't access via webmin or ssh, and DNS were not responding, so I have to ask for a reboot and now everything is fine.

Looking at the logs I found this:

Code:
Jul 18 19:23:12 server sshd[18484]: Failed password for root from 61.145.196.117 port 56817 ssh2
Jul 18 19:23:12 server sshd[18485]: Failed password for root from 61.145.196.117 port 60227 ssh2
Jul 18 19:23:13 server sshd[18488]: Failed password for root from 61.145.196.117 port 38038 ssh2
Jul 18 19:23:15 server sshd[18493]: Failed password for root from 61.145.196.117 port 49884 ssh2
Jul 18 19:24:30 server sshd[18497]: Failed password for root from 61.145.196.117 port 37929 ssh2
Jul 18 19:25:06 server sshd[18521]: Did not receive identification string from 61.145.196.117
Jul 18 19:25:09 server sshd[18508]: Did not receive identification string from 61.145.196.117
Jul 18 19:25:14 server sshd[18505]: fatal: Timeout before authentication for UNKNOWN
Jul 18 19:26:00 server sshd[18509]: Did not receive identification string from 61.145.196.117
And searching that IP on google I found it here: http://www.tcc.edu.tw/netbase/net/in...?fun=240&prd=3

And is flagged as a SSH Attack.

Any ideas why my server stopped working? and how to prevent it?

Im using CentOS 5.0

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SYN Attack

Jun 11, 2009

i found my site load slowly, the cpu load is good. I run this command
[root@host ~]# netstat -nap |grep SYN |wc -l
526

It's seem my server is having problem with SYN attack. Is there anyway to protect it ?

I'm running apache 2.

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Under Attack

May 12, 2009

My site currently in prolong HTTP flood attack since 2 weeks ago. The attack was never stop and for this moment i could only mitigate the attack using my own firewall (hardware).

Since my ISP is not interested to help from upstream, even provide any mitigation services, i could only doing mitigation on my own source or using proxy services alternatively as well, but i've chose to tried on my own. I've tried once on one of well-known mitigation services out there but it seems not fully satisfied me since most of legitimate traffic is blocked from their source.

What i could do now is keep staying alive as well as will not going down on whatever situation becomes worst (but if the attack change to udp attack, i couldn't help myself coz there must be high incoming bandwidth into my network). My network is totaling 10MB last time but since this attack i've been forced to subscribe for 30MB in order to keep balance on the attack.

I've blocked all access except for my country and some other neighbours. If i change policy to allow all countries, the load of firewall will become max and after that hang will hang in less than a minute. I've done load balancing of 4 servers (8GB memory each one) and it seems the condition is getting under control with slight problem of server hang (memory shortage) and very limited keep alive connection.

Now what am i thinking is to buy a router objectively to null route incoming specific IP of countries so i can change my firewall policy to allow all connections as well as to help the firewall itself release its burden halting blocked IP that currently keep hitting itself that could might impact its performance.

Which brands of router is possible doing this thing?

Do you have some other suggestions instead of buying router?

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SYN Attack

Apr 12, 2008

i am just having one issue in one of my highly visited website hangibar.com, its being hosted in softlayer, we are facing synattack too much in this website.

the solution which microsoft given in their website related with tcp/ip registry entry but thing is same , some where and some connections become increases too much over tcp/ip. due to that reason website become very sticky and it stop functioning the execution of sql process, during this issue i have to restart the server to establish a fresh connection.

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Syn Attack

Dec 9, 2008

im getting a syn attack and my vps getting overloaded what im doing is banning ip's that gets most connections

after banning server get normal but if there anyway to stop this post method

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DOS Attack And APF

Oct 30, 2008

My server is under dos attack (http) , I have installed APF firewall and ddos deflate. I configure them to work together.

now if any IP with more than 100 connections is black listed by dos deflate, I can see it in apf's deny_hosts.rules file.

everything seems correct, but my server still very slow.

the ip which is causing that has more than 1000 request and is blacklisted.

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