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  • IP tables blocking access to most hosts but some accesses being logged

    - by epo
    What am I getting wrong? A while back I locked down my web hosting service while hardening it or at least trying to. Apache listens on port 80 only and I set up iptables using the following: IPS="list of IPs" iptables --new-chain webtest # Accept all established connections iptables -A INPUT --protocol tcp --dport 80 --jump webtest iptables -A INPUT --match state --state ESTABLISHED,RELATED --jump ACCEPT iptables -A webtest --match state --state ESTABLISHED,RELATED --jump ACCEPT for ip in $IPS; do iptables -A webtest --match state --state NEW --source $ip --jump ACCEPT done iptables -A webtest --jump DROP However looking at my apache logs I notice various log entries in access_log, e.g. 221.192.199.35 - - [16/May/2010:13:04:31 +0100] "GET http://www.wantsfly.com/prx2.php?hash=926DE27C156B40E55E4CFC8F005053E2D81E6D688AF0 HTTP/1.0" 404 206 "-" "Mozilla/ 4.0 (compatible; MSIE 6.0; Windows NT 5.0)" 201.228.144.124 - - [16/May/2010:11:54:16 +0100] "GET /w00tw00t.at.ISC.SANS.DFind:) HTTP/1.1" 400 226 "-" "-" 207.46.195.224 - - [16/May/2010:04:06:48 +0100] "GET /robots.txt HTTP/1.1" 200 311 "-" "msnbot/2.0b (+http://search.msn.com/msnbot.htm)" How are these slipping through? I don't mind the indexing bots (though I am a little surprised to see them get through). I suppose they must be getting through using the ESTABLISHED,RELATED rules. And no, I can't for the life of me remember why the first match state rule is there So 2 questions: is there a better way to set up iptables to restrict access to specified hosts? How exactly are these 3 examples slipping through?

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  • Blocking IP address with port forwarding

    - by Jeff Storey
    I have a website setup behind a router, so the router has the external facing address and it will forward requests to the webserver inside the network. If there are X number of invalid login attempts, that IP address will be blocked from logging in. The problem is that because the site is being accessed through port forwarding, all requests show up as though they are coming from the router address, and thus the router address becomes the blocked IP. I'm not sure if this is a limitation of the router (linksys wrt160n) or if this a more general issue. Is there a way to handle this?

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  • Windows Server 2008 r2 FTP blocking outside connections

    - by nbon
    I have a windows server 2008r2 running IIS 7.5. I am trying to setup a FTP-server in IIS but I'm running into some annoying problems. Setting up the server works fine but when I try to connect from a remote client the connection times out. I have tried to connect to the FTP-server from the localhost and it works flawlessly. I figured that it should be some trouble with the firewall so I went into firewall settings and disabled the Public Profile and my remote connections worked! In my inbound rules there are rules for FTP-connections to allow all profiles etc. I guess they are made automatically when setting up the FTP-server. Anyone got any idea how to allow remote connections without turning off the public firewall?

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  • Watchguard XTM blocking login attempts

    - by user192702
    routinely I'm seeing lots of login attempts to my mail server trying out various login names starting from A to Z coming from the one IP on one day and another IP on another day. Is there any means to detect this type of activities and block accordingly? I asked Watchguard and it appears they don't support this on their XTM series. Anything else I can do other than to have a super long password?

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  • Blocking of certain file downloads

    - by Philip Fourie
    I have a problem where I cannot completely download a certain file from a server. The file is 1.9MB in size but only 68% is downloaded and then it hangs. I tried and these cases, which failed: Downloaded the file with HTTP Downloaded the file with FTP Moved the file to different FTP and web servers behind the ISA firewall Tried with IIS 6.0 & IIS 7.0 Multiple download clients. Which included FireFox, FileZilla (on Windows) and wget (on Linux) This worked: Downloading other files from the same location on the server. Both bigger and smaller and in size than the original. FTP and HTTP worked. Earlier version of this file (.DLL) works. It is as if the content of this file has an influence on this file being served. Network architecture: Client Machine - Internet (ISP) - ISA Server - IIS 7.0 The only constants are the ISP, Cisco router and the ISA server. Is it possible that something is rejecting the download because of the contents of the file? I am hoping ISA is the culprit... I am not a ISA expert is there somewhere I can look to establish if it is indeed ISA causing this? Update: Splitting the file into two parts with a hex editor results in one half of the file being served correctly and the other part not. Zipping the file results in the file being downloaded successfully. However this is not an option for this particular scenario. Renaming the file and its extension also doesn't work. Update 2009/10/22: It does NOT seems to be ISA that is causing this problem. We connected a laptop (running IIS) on an available public IP and still the file download to 68% before it hanged. The two remaining components are the ISP and the Cisco 800 series router. Anyone knows about an issue on the router perhaps?

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  • APF, IPTABLES, Fedora 15 - Not blocking correctly

    - by RichardW11
    I just got a new remote server which came with Fedora 15. I first tried to run APF but it gave me this error "apf(18031): {glob} unable to load iptables module (ip_tables), aborting.". Which I then set SET_MONOKERN="0" to SET_MONOKERN="1" to resolve the problem. However, with my config file showing BLK_P2P_PORTS="1214,2323,4660_4678,6257,6699,6346,6347,6881_6889,6346,7778" The ports show up as closed, instead of being filtered. Any idea why this would be happening? 22/tcp open ssh 80/tcp open http 443/tcp open https 2323/tcp closed 3d-nfsd 4662/tcp closed edonkey 6346/tcp closed gnutella 6699/tcp closed napster 6881/tcp closed bittorrent-tracker 7778/tcp closed interwise

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  • Blocking facebook's Like button in firefox

    - by Quiark
    Many sites today use widgets from facebook such as the Like button, list of friends who are fans of that site and so on. While it may be a nice feature, I perceive it to be a serious privacy intrusion, because facebook most likely stores information about which sites you visit. I also heard that when you are not logged into facebook, it still tracks the sites you visit (probably with a cookie) and once you log in attaches the data to your real account. For now, I want to keep using facebook, but I would like to block just these widgets so it can't track me. Is there any Firefox extension which could do that?

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  • blocking port 80 via iptables

    - by JoyIan Yee-Hernandez
    I'm having problems with iptables. I am trying to block port 80 from the outside, basically plan is we just need to Tunnel via SSH then we can get on the GUI etc. on a server I have this in my rule: Chain OUTPUT (policy ACCEPT 28145 packets, 14M bytes) pkts bytes target prot opt in out source destination 0 0 DROP tcp -- * eth1 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED And Chain INPUT (policy DROP 41 packets, 6041 bytes) 0 0 DROP tcp -- eth1 * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW,ESTABLISHED Any guys wanna share some insights?

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  • Firewall is blocking internet traffic to OpenVPN clients

    - by user268905
    I have a virtual network setup with a Linux router/firewall connected to two private networks. An OpenVPN server in routing mode and a web server are in one of the networks. On the other are linux client machines which access the webserver and the Internet through the OpenVPN server. Also, external clients can access the OpenVPN from the Internet. The OpenVPN's server.conf is setup to use routing mode in udp, push DNS and routes to the network it is in so clients can access the webserver. Here are my very strict firewall rules. After connecting to the OpenVPN server, my clients can not access the Internet or the web server. When I allow FORWARD traffic to go through, it works just fine. The OpenVPN server has full internet connectivity. What firewall rule do I need to add to allow internet traffic to reach my clients?

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  • Samba deny host not blocking that host

    - by datadevil
    I want to block access to some Samba shares from a certain machine, but somehow I can't get it to work: the machine can still access the shares, and I did restart and reload the samba daemon. Here is a part of my configuration: security = share hosts allow = 127.0.0.1 192.168.1.0/24 interfaces = 127.0.0.1 eth1 192.168.1.2 bind interfaces only = yes hosts deny = 192.168.1.251 encrypt passwords = yes guest ok = yes The shares themselves look like this: [examples] comment = Example path = /foo/bar read only = No guest ok = yes What am I doing wrong here?

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  • UFW blocking webrick on port 3000

    - by t Book
    On a ubuntu 10.0.4 server runs redmine. starting webrick with: ./server webrick -e production -b lvps46-173-79-113.dedicated.hosteurope.de -d makes redmine available in browser. as soon as we enable ufw, webrick can´t be accessed anymore. of course we allowed Port 3000 from anywhere ufw allow 3000/tcp ufw allow 3000/udp also a grep for iptables doesn´t show a deny rule iptables -nL | grep 3000 find the whole iptables output here http://pastebin.com/k6WNqdPU checking lsof -ni tcp:2222 tells me ruby is listening on port 3000 ruby 3457 root 5u IPv4 864846667 0t0 TCP 46.173.79.113:3000 (LISTEN) What else can we check? what´s wrong with the ufw rules for port 3000?

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  • Non-blocking service to receive messages on port via UDP

    - by stUrb
    I want to build a service on my Linux VPS which listens to a certain UDP port and does something with the (text)message which is captured. This processing consists of appending the message to a locally stored txt-file and send it as http, with a post variable to another server. I've looked into Nginx but as far is can see this server can only be bound to receive http packets. Although it is asynchronous. What is the best way to achieve this listening-service on linux? And which has the capabilities to do the above mentioned processing?

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  • CentOS I/O blocking flushing dirtypages

    - by user3662224
    I have an Apache webserver on CentOS. It is not doing anything fantastic or complicated at all but it does at intervals experience a high load (120 for 4 CPUs) for some reason. During this time I see high waits and write durations. I have narrowed this down to flushing of dirtypages to disk to make room for new data. I have tried many things and talked to the developers who are also puzzled by this. I am stumped. Details: vmware virtual guest server 4 cpus 12G RAM Apache PHP I have 40 servers in this cluster that share the same disk structure. Only the webservers are experiencing this issue. Any ideas?

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  • iptable rules not blocking

    - by psychok7
    so i am trying to allow ssh access to a certain range of ips (from 192.168.1.1 to 192.168.1.24) and block all the rest but since i am new to iptables i can't seem to figure, i have : iptables -A INPUT -s 192.168.1.0/24 -p udp --dport ssh -j ACCEPT iptables -A INPUT -s 192.168.1.0/24 -p tcp --dport ssh -j ACCEPT iptables -A INPUT -p tcp --dport ssh -j REJECT iptables -A INPUT -p udp --dport ssh -j REJECT but this does not work, with a vm set with 192.168.1.89 i can still access through ssh. can someone help?

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  • Simple thread-safe non-blocking file logger class in c#

    - by Jason Renlan
    I have a web application, that will log some information to a file. I am looking for a simple thread-safe non-blocking file logger class in c#. I have little experience with threading. I known there are great logging components out there like log4Net, Enterprise Library Logging Block, ELMAH, but I do not want an external dependence for my application. I was thinking about using this queue implementation http://www.codeproject.com/KB/cpp/lockfreeq.aspx

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  • Non-blocking MySQL updates with java?

    - by justkevin
    For a multiplayer game I'm working on I'd like to record events to the mysql database without blocking the game update thread so that if the database is busy or a table is locked the game doesn't stop running while it waits for a write. What's the best way to accomplish this? I'm using c3p0 to manage the database connection pool. My best idea so far is to add query update strings to a synchronized list with an independent thread checking the list every 100ms and executing the queries it finds there.

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  • Detecting I/O errors in a NON BLOCKING SOCKET

    - by ripunjay-tripathi-gmail-com
    I am writing a client - server system in which I used NON-BLOCKING sockets. My problem is to detect error { while performing send() or write() } that may occur while data transfer. Example lets say, while the data is being transferred the peer crashes. Another case there is some network problem, something like wire unplugged etc. As of now, I am using a high level ACK, that peer sends after receiving the complete data. Ripunjay Tripathi

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  • <object> for PDF is blocking drop-down menu

    - by Tumharyyaaden
    URL: http://hartford.uconn.edu/director/academic_plan.html It is an HTML page, and using to display PDF document. Which is blocking the jQuery drop down menu. I have tried using CSS z-index property with positioning specified. Also tried setting wmode="transparent" / wmode="opaque" / and other variations but nothing seems to work.

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  • IIS - IP Address and Domain Name Restrictions - not blocking IP addresses

    - by Funky
    I have added an IP address in IIS7 in the IP address and domain restrictions. From what I have read this should block all traffic to the folder apart from the allowed IP address. For some reason this does not work. If I access the section from my work computer all ok, when I access it from my phone I can still see the page. Does anyone have any idea why IIS is not blocking all the other IPs out? Thanks

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  • Ruby Win32Api get single character non-blocking

    - by Markus Orreilly
    I'm trying to write a simple game working with two threads, one thread to get input from the user, and another thread to animate some scenes. I'm able to get characters without pressing ENTER just fine, but it blocks in the animating thread until the user presses a key. Does anyone know of a way to get a character from the keyboard non-blocking?

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  • Editline with non-blocking input.

    - by Sasun Hambardzumyan
    I use editline library in my program, for user commands input in shell. But becides shell, program have a gui interface, so I need to run editline's readline() function in separate thread, because it blocks until Enter pressed. Is there a way to use readline() function without blocking, so I could avoid separate thread usage?

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