on my linux server i have many websites but with difrent ips address, is some way to i can block all the ips with many connection (100+) just from my website not from all websites
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I have noticed interesting problem. I use two browsers - Firefox and Konqueror. Konqueror is configured to use tor, Firefox not. Using Gufw I block all incoming and outgoing traffic and it works while using Firefox, I mean that I can't view any www site and it is ok. But if I use Konqueror I can establish any conection. How to understand this? Should I have different firewall while using tor?
View 5 Replies View RelatedIs it fair to say that connLimit and hashlimit are very similiar on Linux i.e. while hashlimit caters to limits for groups of ports, they both set the connection rate limit per host? How in IPTables, do I configure a policy that limits connections on a port that encapsulates the total sum of all connections from all hosts? i.e. I do not want to allow more than 6000conn/minute for port range that is the sum of all connecting hosts?
View 3 Replies View RelatedI need some suggestions on software. I would like to offer remote desktop support to some of our clients, but some of them are using ISP's that block incoming connections so, VNC is out of the question. I was wondering if there is something similar to logmein for ubuntu?
View 1 Replies View RelatedOk so, buddy of mine has his ssh server setup and upon checking his logs he sees a ton of failed attempts. Now obviously these are people that are scanning him and trying to brute force him. So is there a way to block them? We know you can block each IP but is there a way to block ALL connections except for certain ones, such as his and mine? Maybe a couple others.
View 6 Replies View RelatedI am trying to write a shell script that will block any outgoing Internet connection, focusing mainly on the HTTP connections.
It would be nice if this command could work on both Mac OSX and Linux.
I am still new to ubuntu and I use firestarter as my firewall tool and I was told that its just ufw in a gui. Well anyways I noticed a connection to 174.129.241.144 using https and python, I didn't have any scripts running and my browser was closed, I read the man files for ufw and it said to do something like deny from 174.129.0.0/12 and I want to block all incoming and outgoing connections to this IP range and I was wondering how to do that, I heard of iptables that it would be able to do this but I dont know anything about it. What I should learn so I can handle these kinds of situation in the future and how I can block this ip subnet or also what does the /8, /12, and /16 stand for?
View 7 Replies View RelatedMy server gets ddos attacks. I dig into access logs and I saw that attacker ips doesn't have valid requests headers, like their browser application info or requested url info.I want to close those connections immediately, and if it's possible block those ips for a time period.Can I do that with Apache and iptables?I searched on the internet but couldn't find useful results. Probably couldn't search for the right words.
View 2 Replies View Relatedhave a problem with my network-manager in ubuntu 10.10.when I dial one of my vpn connections, my other vpn connections be disabled and I can't use them!I tried to restart network-manager and gnome-panel, but it does't seem to solve this problem.
View 1 Replies View RelatedFor some time now I've been noticing the network activity light for my linux box blinking like mad on my router. After a little looking around for ways to see what connections my box has established, I found the following using lsof -i
Code:
bash 13839 root 1u IPv4 3118972 TCP shana:49148->Oslo.NO.EU.undernet.org:ircd (SYN_SENT)
bash 13839 root 2u IPv4 3118986 TCP shana:34323->161.53.178.240:distinct
[code]....
I know I'm not using IRC, and I have my sshd locked down fairly tight, requiring a key to log in, so obviously, it looks like there's something or somebody in Croatia (the origin of that IP address) connecting my system to undernet.org for some nefarious purpose. Looking at my processes, ID 13839 shows up as
Code:
13839 ? S 0:00 bash
Just 'bash', not '-bash' as
Code:
13426 pts/0 S 0:00 -bash
my session appears. Previously, this odd bash process was ID 2704, which seemed to imply that it had launched fairly soon after my system booted up which really makes me wonder. Oh, and yes, I did kill that 2704 process, and it returned as this 13839. 2704 also had those same IRC connections present in lsof.
Its been really bugging me that whenever I scan my connection with wireshark I see this one person sending me a SYN packet every minute on port 445. I know this is the dangerous port that the Conficker worm travels along. So far my computer seems to be immune and I know, at least on the Linux side that I can just add a rule to my ip tables to block that port indefinitely. I want to know what the next step is.
00 0c 41 b2 e4 1d 00 11 09 b2 2f 0e 08 00 45 00
00 30 91 84 40 00 80 06 d1 c7 46 4f 86 29 XX XX
XX XX 10 43 01 bd 9e 23 d6 27 00 00 00 00 70 02
ff ff 65 58 00 00 02 04 05 b4 01 01 04 02
This is one of the packet captures I am getting. After sending me this and getting no reply, all of a sudden he goes up an ip. Basically this would be the pseudocode for what it looks like hes doing on my end.
while(1){
for(int i = 1; i != 255; i++){
send_connection_attempt("XX.XX.XX." + i);
}
}
To me this looks like this guy has hijacked a computer and is using it to run a script over. He is still scanning my network as I said earlier, what should I do? Should I contact my ISP? or just nail down the hatches and make sure nothing is exposed on my network?
I checked all the logs in /var/log but couldn't see anything (I was hoping /var/log/auth.log would have it, just like it has ssh connections in there). I've got a machine that several people VNC into and I would like to keep track of things. Are there other VNC servers out there that keep logs? I could switch, but I went with krfb because it works perfectly for me and came already installed.
View 2 Replies View RelatedI might be misunderstanding the log but it looks like UFW is blocking connections. I want to allow all incoming and outgoing. I guess what I'm saying is that the servers on my computer will open ports but all other ports should respond with closed just like a default Ubuntu install. Trying to use UFW to monitor connections without really doing any firewalling.
Code:
Aug 1 07:14:07 universal-mechanism kernel: [311111.963762] [UFW BLOCK] IN=eth0 OUT= MAC=00:1f:c6:8a:e9:66:00:01:5c:32:f4:c1:08:00 SRC=72.21.203.146 DST=174.44.178.56 LEN=40 TOS=0x00 PREC=0x00 TTL=233 ID=51984 DF PROTO=TCP SPT=80 DPT=54466 WINDOW=8201 RES=0x00 RST URGP=0
Dist: Fedora 14
SSHD: OpenSSH 5.5p1
I need to limit the number of ssh connections a user has. All the users are using tunnel only so their shell is set to /sbin/nologin The logins do not open a shell they just create the tunnel so /etc/security/limits.conf has no effect on them at all.
I tried setting 'MaxSessions 1' in sshd_config but either that doesn't not do what I expect it to or it plain does not work as even with a normal user I was able to open an unlimited number of sessions. I need a good secure way to limit each user to 1 ssh session without them having a shell but Im unable to find a solution.
Is this how I would do that?
iptables -A INPUT -p tcp --destination-port 21 -d ! 168.192.1.2 -j DROP
This should block all incoming connections on port 21 from 192.168.1.2, correct? Thus preventing that IP from logging into my FTP.
I know that GNU/Linux does not need a firewall (due to iptables), but I would like a basic firewall that would watch incoming and outgoing connections. I would prefer it to have a try icon and be able to run as a regular user, such that I can add it to my .fluxbox/startup file. Anyone know of any good ones? They don't actually have to interface into iptables (because I would do that myself), but if they do it would be a bonus.
View 4 Replies View RelatedI am running Ubuntu 10.10 I have an question about the firewall Firestarter, when checking the firewall it told me there are 9 serious incoming connections what must I do with this info. Inbound is normally blocked as standard i have also see that someone with port 1234 and 12345 have trying to attempt mine system but failed all trojan ports are fully blocked.
View 2 Replies View RelatedI have tried to configure my iptables to allow only HTTPS connections to the internet. Unfortunately, I didn't get that to work. I configured it like this:
Quote:
iptables -P INPUT DROP
iptables -P OUTPUT DROP
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A OUTPUT -t filter -p tcp --dport 53 -j ACCEPT
iptables -A OUTPUT -t filter -p udp --dport 53 -j ACCEPT
[Code]....
Of course I am only trying to access websites via HTTPS Still, I was wondering if HTTPS somehow under the hood requires the HTTP port to be open or if my rules are in some other way wrong.
ps: I got the rules from that website: [URL]
I'm trying to adjust the firewall to only inbound syn connections.
To Allow all home subnets access to port 53 both tcp/udp but deny the rest.
I am running Firestarter on Ubuntu 9.10 64 bit. I have noticed several times that after closing all web apps (Firefox, Thunderbird) that some entries remain under the heading "Active connections" on the Firestarter "Status" tab. Often these show no source program. Currently I have 2 showing which show Firefox as the source. These persist after Firefox is shut down. I have verified that no Firfox process is running. And both of the IPs point to google.I have Disconnected eht0 and they still show. I have logged out and back in and they still show. I must reboot the machine to make these entries go away. Which makes me think perhaps this is a bug in Firestarter(?) Is there another way I can identify truly active connections?
View 2 Replies View Relatedif i want user should`t have more than 20 sftp connections to a server,is there any way we can limit no.of connections to a particular user on the server using ssh configuration
View 7 Replies View RelatedWhat is the easiest way to block one specifiek web page?Can I use the file /etc/deny host, or should I use another program to do this?I have already search the web andfound iptables, but that is to difficult for me, and I found squid
View 1 Replies View RelatedWhat i wanted to do was block everything from getting in my pc but still be able to surf the web and still use instant messenger.
View 2 Replies View RelatedI'm trying to block an incoming URL. My ISP is hijacking 404 pages and annoyingly changing the URL line in the browser and flashing all sorts of popup ads. I just need it for incoming URLs which my router doesn't seem to handle. I'd prefer something packaged with Ubuntu 8.04, but anything simple will do. I know in KDE I could edit the kdeglobals file with:
[KDE URL Restrictions]
rule_1=open,,,,[URL],,false
rule_count=1
Im running Centos 5.4 with a sftp server, and I�d like to allow all 172.16.0.x ip and 192.168.0.x ip and block everything else. Does someone have a good way to do this with IPTables or any other opensource FW?
View 10 Replies View RelatedWhat's the best way in centos to block a user from accessing mysql. I don't want him to be able to run the mysql command, so just putting passwords up in mysql is not good enough. Mysql is running ad user=mysql, and i added the user in a different group by he is able to access mysql by typing in the command.
How can i block this command being availible for this user.
I was wondering how to block attachments to gmail. I am running squid 2.7 stab9 with dansguardian 2.10, users authenticated from LDAP. I have configured the POST restrictions in Dansguardian which does block all attachments to hotmail/yahoo etc etc but attachments to gmail continue to upload.
View 1 Replies View RelatedI am looking for an answer about how to allow just one trusted DHCP server and block others ?I am using Centos 5.5, iptables and dhclient.I have read that it is impossible to block DHCP Replay using iptables: URL...So how can I do that ? Maybe another dhcp client?
View 4 Replies View Relatedhere i would like to inform you that my company ask me to block facebook site at the work time it is: 08:00-12:30 and 14:00-17:30 in proxy server.i'm still confuse how to do!i need the details configuration in squid regarding how to block the sites
View 2 Replies View RelatedFor the last four days, I have been getting HIDS alerts like these:
Code:
152.2.x.x - - [15/Feb/2011:04:28:59 -0500] "PROPFIND /C%24.co HTTP/1.1" 405 231
152.2.x.x - - [15/Feb/2011:04:28:59 -0500] "PROPFIND /C%24.com HTTP/1.1" 405 232
[code]....
