Flood In FTP And Brute Force

Oct 27, 2008

flood in FTP and brute force

all day i receved msgs of BFD someone trying acess server, how to stop it, exemple:
Executed ban command:

/etc/apf/apf -d {bfd.pure-ftpd}
The following are event logs from on service pure-ftpd (all time stamps are GMT -0500):

Oct 25 13:52:37 svr1 pure-ftpd: (?@ [INFO] New connection from
Oct 25 13:52:37 svr1 pure-ftpd: (?@ [INFO] New connection from
Oct 25 13:52:38 svr1 pure-ftpd: (?@ [WARNING] Authentication failed for user [router] ....

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FTP Brute Force

May 19, 2008

I checked my attachments folder in WHMCS dir

There was a file ftpquickbrute_08.05.2008_10_47_08.log
Opened it up it says:


FTP Quick Brute (called c99shell v. w4ck1ng-shell (Private Build v0.3)) started at 08.05.2008 10:47:21

No success. connections!

Total time (secs.): 3.2036
Total connections: 101
Success.: 0
Connects per second: 31.53

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Brute Force Attack On VPS

Jul 1, 2008

Today I woke up to a couple of emails from people in China and India trying to break into my server. Then as I went to login to WHM I get this message:

This account is currently locked out because a brute force attempt was detected. Please wait 10 minutes and try again. Attempting to login again will only increase this delay.

If you frequently experience this problem, we recommend having your username changed to something less generic.

Are there ways that I can prevent these attacks? I know that the IPs involved are getting banned, but are there any other methods I should be taking?

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Brute Force In CPanel

Nov 2, 2008

Over the last few weeks I've been getting emails from WHM stating "x login failures attempts to account root (system) -- too many attempts from this ip"

These emails have been coming in almost hourly and it seems as though somebody is trying to guess the password to the root account and random other accounts.

For now I reduced the amount of failed login attempts to 2 before cPanel blocks the IP.

Is there any other way I can completely stop this person from even attempting to guess my passwords?

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Brute Force Attempted Through SSH

Mar 17, 2008

For a company I'm working at, two nodes have been brute force attempted through SSH. I've got the logs from both servers in front of me, but could anyone enlighten me of who the ISP is?

ISP: host-80-241-179-30.deltanet.ge

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Brute Force Attack

Mar 11, 2008

I have a managed VPS and I haven't really ever paid too much attention to the logs until now.

I noticed that the APF logs indicate a 2-5 attacks on my server attempting to log in via ssh. My system allows 10 minutes of log in failure attacks before apf bans the ip.

To eliminate the method of attack, I see 2 ways. One way is to change the SSH port; the second is to only allow ssh via specified ip's.

What are the pro's and con's of both... also are there other ways to eliminate these attacks via ssh?

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Brute Force Detection (bfd)

Apr 6, 2007

ive just installed bfd on a new server:


And im getting the following in an email every 10 minutes:

/usr/local/bfd/conf.bfd: line 26:
: command not found
/usr/local/bfd/conf.bfd: line 38:
: command not found
/usr/local/bfd/conf.bfd: line 47:
: command not found
/usr/local/bfd/conf.bfd: line 59:
: command not found
/usr/local/bfd/conf.bfd: line 60:
: command not found
/usr/local/bfd/conf.bfd: line 76:
: command not found
/usr/local/bfd/conf.bfd: line 88:
: command not found
The email is being sent from:

Cron Daemon <root@hostname.com> (replaced hostname myself)

Now i know this isnt r-fx networks support but none of there support options seem to work so i figured id post here considering the amount of users that are likely to be using bfd (or you should be)

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DoD Brute Force Attack

Jan 14, 2007

Ok, this is weird. What do you do when your VPS was submitted to a brute force attack from the U.S Department of Defense?

The IP Whois and Reverse DNS gives me "DoD Network Information Center", why in the world would they try to force access to a small (less than 20 clients) Canadian host?

And in case you're wondering, they don't seem to have any abuse email address.

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Anti Brute Force Protection

Apr 30, 2009

I have some windows 2k3 and 2k8 win servers and now i must to protect..

I need best free/commercial solution for firewall and anti brute force protection.

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WHM/Centos/VPS Having Brute Force Attacks

Jan 29, 2008

I am getting these types of reports in my nightly reports:

Authentication Failures:
unknown (bips131.bi.ehu.es): 212 Time(s)
mail (bips131.bi.ehu.es): 4 Time(s)
news (bips131.bi.ehu.es): 4 Time(s)
root (bips131.bi.ehu.es): 4 Time(s)
unknown (swplinux02.swp.ewr.qwest.net): 1 Time(s)
Invalid Users:
Unknown Account: 213 Time(s)

Two nights ago:

--------------------- pam_unix Begin ------------------------

Authentication Failures:
unknown ( 413 Time(s)
root ( 108 Time(s)
webadmin ( 18 Time(s)
root ( 16 Time(s)
daemon ( 8 Time(s)
ftp ( 5 Time(s)
root ( 4 Time(s)
Invalid Users:
Unknown Account: 413 Time(s)

My VPS support said I could try:

-alternate sshd port
-require key access
-selecting client ip access
-rate limit incoming sshd syn packets per src address

However, I need some help understanding the best way to address these so that these brute force attacks aren't successful.

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Brute Force Warning - 11 In 2 Days

Dec 13, 2007

over the last 2 days I've gotten 11 emails telling me about brute force detections on my server, the vast majority of them are for sshd from different IP's.the number of events ranges anywhere from 11 to 515.

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The Best Firewall And Brute Force Attacks

Jul 10, 2007

What is everybody using?

Is there a "Best"

What do you guys recommend?

I have read about the CSF, is this any good?

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Brute Force UDP Attack On SSH Port. . Possible/why

Nov 24, 2007

my server is being brute force attacked at port 22.. It caused my server to be blocked by my ISP's upstream...

at first I follow the instruction on this forum showthread.php?t=456571 (can't post link)

but then I realized (from the upstream email, I don't have access to any log on their side) that it was UDP.. not TCP.. but it was said to be brute force attack on SSH port.

Now all I do is moved ssh port.. and then limit the max connection per minute to port 22/UDP like on the above tutorial page..

Is that enough? I can't use IPTables to permit specific IPs, I'm pretty much very mobile so my own IP is different each time.

Any ideas why UDP attack?

Is it possible that brute force attack turned out to be UDP protocol? cause if it's not, then I think my ISP/its upstream can't be trusted..

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Avoiding Port Scanning And Brute Force

Oct 28, 2009

I get a lot of messages from CSF about Port Scanning and Bruteforce detection.. Is there a way to avoid all of these attacks ? Because it tries to figure out my clients ftp or pop3 user with several usernames, i.e. administrator, postgres, mysql, httpd, and many more..

I know a little about internet security.. Is it possible to make my public IP of shared hosting untraceable ? Like this one..

Just do a ping to ebay.com or paypal.com and then you will receive RTO message or Destination host unreachable, but actually the site is running well..

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IIS FTP Brute Force Attack How To Prevent At Network Level

Jan 21, 2008

I am getting a few hundred IIS 6.0 FTP login attempts a second on my windows 2003 x64 server.

We have a Sonicwall TZ180, a full IPS and Firewall in front of the server but I cannot determine a way to block these attacks. I simply have port 25 open to all ip addresses, as I do not know a range of valid ips.

Is there any way to prevent these attacks at the firewall/hardware level? I suspect not, because the firewall doesn’t know if a login attempt is valid or not.

I have enabled IPS on the firewall but doesn’t appear to be stopping these attacks. Is there any way to automatically ban ips that hit port 25 X number of times in a second?

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Syn Flood

May 11, 2009

I've been getting a syn flood for the last week or so.

I've pretty much tried everything I could online but have been unsuccessful in stopping them.

I talked to the data center techs and they basically can't put a stop to it either.

Here's a very small portion of my netstat

tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -
tcp 0 0 xxx.xxx.xxx.xxx:80 SYN_RECV -

root@xxx [/]# netstat -nap |grep SYN |wc -l

The IP's change often and it's not possible to narrow it down.

So far the things I have done;

syn cookies enabled

reduced time out
echo "1" > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_syn_recv

echo "150000" > /proc/sys/net/ipv4/ip_conntrack_max

installed apf but it slowed down the server to a crawl which made my clients really unhappy so had to remove it.

The bandwidth is constantly staying at 30Mbps with slight bumps here and there but every day around 7pm it drops completely to normal levels and the flood stops. It starts back up around 7 in the morning.

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SYN Flood Attack

Jul 28, 2009

We are currently experiencing an SYN Flood attack on our primary production server and are looking for some help in resolving the issue.

Novell SUSE Linux Enterprise Server 10.2-64
SuperMicro X7DBR-E Intel Xeon QuadCore DualProc SATA [2Proc]
Processor Intel Xeon-Clovertown 5320L-QuadCore [1.86GHz]
8GB Memory
@ Softlayer DC in Texas.

Need help within the next hour or two. Please ask any necessary follow up questions and how you might go about resolving the issue (i.e. SYN Cookies, etc.)

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SYN Flood Attack

May 3, 2009

someone decided to attack my webserver and I can't figure out how to block it.

tcp 0 0 localhost:80 SYN_RECV
tcp 0 0 localhost:80 SYN_RECV
tcp 0 0 localhost:80 SYN_RECV

It's literally thousands of those requests overloading apache. The server is fine, the load average is like .8. But none of the website are loading.

We're hosting with ThePlanet, and they're doing a great job at blocking a huge portion of the attack. But we're still getting hit pretty hard. I've got APF installed, and 3 or 4 anti-dos scripts.

Every once in a while a page will load for the websites, I think we've got just under 50 legit connections.

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How Can I Best Work With A Syn Flood?

Jun 11, 2008

How can I best work with a syn flood? I've tried the apf, deflate-ddos etc.... and don't work. Even tried litespeed etc but doesn't work against a 90mbps attack.

If I get a few servers, how would I have it setup to best defend?

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Syn Flood Protection

Jul 25, 2008

one of my server were hit by massive ddos syn atack. target was port 80-apache

i am running centos 5 in xen vps iptables were strong with syn filtering and limit
but...what can do?

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Connection Flood

Mar 8, 2008

I don't know it anymore. Tried everything. I can not reach my server properly. A lot of time time out.

netstat -anp |grep 'tcp|udp' | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n


348 connections from an empty IP? i have tried syn cookies, let the firewall block all ports without results.

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How To Prevent DNS Flood

May 28, 2008

Can anyone share tips how to prevent DNS flood on a cPanel and Directadmin server platform on Centos?

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Does Keepalive Off Help In Syn Flood

May 29, 2008

Does keepalive off help in syn flood?

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How To Detect Flood Ftp

May 4, 2008

My server run after 10h sevices ftp is down (network error: connection timed out). may be flood ftp.

how to Detect flood ftp.

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UDP Flood And Bandwidth

Apr 4, 2008

We got hit with a huge bandwidth bill for last month. It was 4X our usual bill. The ISP said that we were the victim of UDP flood attacks from an outside server. We have a sonicwall router and the firewall seems to be blocking the port that the ISP claims the attacks can from. Is it possible that the attacks would still count towards our bandwidth usage even if the connection is refused by our firewall? Our ISP uses 95th percentile billing.

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SYN Flood .. No Way To Stop It ?

Oct 30, 2007

One of the servers have 1 account on, but seems like its extremely attacked. I cannot SSH and many packet loss. so I asked softlayer and they access it and said its a SYN Flood as from the /var/log/messages (I cannot see it as the server is not accessable) they put the main public ip under Cisco guard but still didn't help. when I asked for any solution, unfortunaly I were told there isn't and have to wait the attackers to stop as it comes from MANY addresses that iptables even won't help.

Isn't there any solution (software-hardware) to stop that ?

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Ddos Attacks / Udp Flood

Jun 25, 2008

one of my costumers server is getting ddos attacks. I solved syn and get attacks with litespeed web server but I have another problem. They started to do udp flood. I m losing connection to my server. I bought new server with 1 gbit port for solving it.

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Robots Flood My Server

Jul 26, 2009

I use Outpost Firewall to view active connections to my server. If I don't restart the httpd service on a regular basis my server will grind to a halt from being flooded by robots.

I currently have the service set up to restart at Midnight and Noon every day. Sometimes that's enough, lately it's not. For example, I checked an hour ago and I had 385 connections to httpd. At least 50% of the connections were robots - tons of the same IP addresses and they're just crawling the site.

Almost all of the connections show up as less than 1kb bytes received and 0 bytes sent per connection.

I already have a good 20 connections by these robots and the connection time shows as 11 minutes... I just browsed to a web gallery page on my site figuring that'd be mildly "intensive" on connections with all the thumbnails and my connections aren't lasting more than one minute.

So, what's with all these connections that are lasting 10+ minutes? I've even got one connection that has an Uptime of 30 minutes, bytes sent 65811, bytes received 180. It seems like something with these robots doesn't terminate correctly...

what to do so these connections quit jamming my server up? It's like a very very slow DOS...

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Flood Connections On Port 80

Aug 1, 2007

When I check on port 80 connections, I get a list of few IPs with more than 100 connections.

I need to know which website / specific file being downloaded / URL is the IP accessing to? How can I do that?

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