similar to: limiting number of incorrect logins per connection

I'm running Centos 7.8.2003, with firewalld. I was getting huge numbers of ssh attempts per day from a few specific ip blocks. The offenders are 45.0.0.0/24, 49.0.0.0/24, 51.0.0.0/24, 111.0.0.0/24 and 118.0.0.0/24, and they amounted to a multiple thousands of attempts per day. I installed and configured fail2ban, but still saw a lot of attempts in the logs, and the ipset created was

On 8/7/2018 5:08 PM, Adi Pircalabu wrote: > - Since you're on dynamic IP at home, set up a VPN tunnel using the > mailserver as server and HTPC as client. OpenVPN is ubiquitous and > widely supported. > - rsync your mailboxes using the tunnel connection. > This way you can back up your entire server, not only the mailboxes. Instead of openvpn, I use openssh. Use compression

Well, correct me if I'm wrong, but I would say this conversation you have posted is a bit outdated, now fail2ban can be used with asterisk security log https://wiki.asterisk.org/wiki/display/AST/Asterisk+Security+Event+Logger. On Thu, Aug 17, 2017, 4:53 AM Telium Technical Support <support at telium.ca> wrote: > Keep in mind that the attacks you are seeing in the log are ONLY the

Hi all, Lately, I've seen an increase in the number of attacks against my system from the so-called "Friendly Scanner." When one of these script kiddies targets my server, all I see for symptoms is a few of my trunks become lagged due to server load and a stream of messages on the console that resemble this: [Aug 2 20:27:50] == Using SIP VIDEO CoS mark 6 [Aug 2 20:27:50] ==

On 12/30/2017 08:18 PM, Dovid Bender wrote: > Script kiddies trying to find vulnerable systems that they can make > calls on. Lock down the box with iptables and use fail2ban to block > them. The via is probably bogus unless a box at the DoD was comprimised. > > > > On Sat, Dec 30, 2017 at 6:49 PM, sean darcy <seandarcy2 at gmail.com > <mailto:seandarcy2 at

On a VPS I wanted to add to IP tables:- iptables -A XXXX -p tcp -m string --algo bm --string 'login' -j DROP I got: iptables: Unknown error 18446744073709551615 uname -a = 2.6.35.4 #2 (don't know how this got installed) lsmod | grep ipt = ipt_LOG 5419 2 yum upgrade iptables* = nothing to install. --------------------------------------- On a standalone server (C 5.6)

just wanted to get some feedback from the community. Over the last few days I have noticed my web server and email box have attempted to ssh'd to using weird names like admin,appuser,nobody,etc.... None of these are valid users. I know that I can block sshd all together with iptables but that will not work for us. I did a little research on google and found programs like sshguard and

I've been getting a lot of timeouts on non-critical invite transactions. I turned on sip debug. They were the result of SIP invites like this: Retransmitting #10 (NAT) to 185.107.94.10:13057: SIP/2.0 401 Unauthorized Via: SIP/2.0/UDP 215.45.145.211:5060;branch=z9hG4bK-524287-1---zg4cfkl50hpwpv4p;received=185.107.94.10;rport=13057 From:

I am being attacked by an entire subnet where the first two parts of the IP address remain identical but the last two parts vary sufficiently that it is not caught by fail2ban since the attempts do not meet the cut-off of a certain number of attempts within the given time. Has anyone created a fail2ban filter for this type of attack? As of right now, I have manually banned a range of IP addresses

Hi, Is there a way, or can a way be added, to add an "auth_failed_delay=10s" style option that would put in an artificial delay after a failed password attempt? As it stands now, Dovecot seems highly vulnerable to widescale brute-force password dictionary scans. Even if it's not configurable, can a delay be hardcoded to something like, say, 10 or 15 seconds? -- Dean Brooks dean

Dear OpenSSH developers, a publicly accessible sshd on port 22 generates a lot of log clutter from unauthenticated connections. For an exemplary host on a university network, sshd accumulates 5~20k log lines on a single day (more than 90% of the total amount of syslog lines). That is despite the host having a restricted configuration (no SSH password authentication, firewall rate limit for

Hi, I've recently had a fairly prolonged SIP registration attack, 18 hours in this case and often with 200 attempts per second, and suspect I've had a number of these in the past. The main symptom I noticed previously was, because Asterisk was responding to each registration request it received, it was very quickly using up my 448 kbps upload limit for my home ADSL connection: any

Hi all, I'm trying to get my head around our Asterisk network configuration. We've been using it for about 2 years now (home office) and it works great. Its Asterisk 1.4.2 with SIP through external provider(s). We have the Asterisk server behind our IPCop firewall, and have a dedicated IP address that comes to the firewall from our ISP (Cox) and that is routed to our Asterisk box

Hello All, I had problems with the security server, the server is frequently attacked using bruteforce attacks. Is there an application that can perform automatic blocking when there are failed login to the ports smtp, pop3 port, and others? I am currently using CentOS 5.5 in some servers Thanks in advanced....... -- -- Best regards, David http://blog.pnyet.web.id -------------- next part

My webserver also houses our mailserver. There's about six users on that mail system and I'm thinking it would be good to back up the mailboxes to my always on HTPC computer at home, which is reachable via a dynamic IP service. I know (or think) I need to use doveadm-backup for this but rather than reinvent the wheel (or use the wrong wheel altogether) I'm wondering if anyone can

Hi, to prevent scripted dictionary attacks to sshd I applied those iptables rules: -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -m recent --update --seconds 60 --hitcount 4 --name SSH --rsource -j DROP -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -m recent --set --name SSH --rsource And this is part of logwatch: sshd: Authentication Failures: unknown

I want to try out fail2ban and notice that both, kbs-CentOS-Testing and ATrpms, have shorewall as a dependency. I do not use shorewall and have never used it. I have my own iptables/firewall script and am happy with it. Can I install shorewall without any ill effects to my current sue of iptables or would I need to use shorewall for firewalling from that point on? (It may be a good product,

Just a "heads-up" ... my home asterisk server is being flooded by someone from IP 184.73.17.150 which is an Amazon EC2 instance by the looks of it - they're trying to send SIP subscribes to one account - and they're flooding the requests in - it's averaging some 600Kbits/sec of incoming UDP data or about 200 a second )-: This is much worse than anything else I've

I have experience block DDoS atacks. Contac White me in prived. If you have intereses. El mi?., 8 ene. 2020 8:45 p. m., Keith Christian <keith1christian at gmail.com> escribi?: > On Wed, Jan 8, 2020 at 5:37 PM H <agents at meddatainc.com> wrote: > > > I am being attacked by an entire subnet where the first two parts of the > > IP address remain identical but the

I have been using centos 6 in a virtualized system for a few months now. Took a while to batten down the hatches with postfix, rbls, and to use fail2ban correctly. The mailserver for my website(s) are located on the http server as well..an 'all in one' server. DNS servers are separated. My two sites, and their emails addresses (1 for each) have been around for 10 and 15 years