Security :: Stop An IP From Connecting To Server?
Nov 9, 2010
Im using ubuntu and i run a game server. Ever since i posted my server i have an IP address trying to join my game on a different port everytime, seems random and its nonstop for a week since its been up.
[INFO]/72.52.102.33:[random 5 digit port] lost connection NONstop
I port scanned them and i think its not a person but some service or server type buisness.
I use a linksys router, i couldnt find anything on blocking IP's at the router from the outside.
Is there anything i can do to stop them before the get to this server to login?
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Mar 1, 2010
I'm using Postgresql 8.4.2-2. I'm trying to remote into my server securely. I figure I could do so with ssh. Apparently I figured correctly, as per, [URL] and [URL] I setup the ssh tunnel. ssh -L 5432:serverip:5432 Then I setup pgadmin3 to connect as follows:
host: localhost
port: 5432
user: postgres
maintenance db: postgres
And I receive the following error:
An error has occurred: Quote: An error has occurred: Error connecting to the server: server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request.
I'm not sure what the problem is. I can connect with Code: psql from the cli after connecting to the terminal via ssh. So I know that I'm using the correct password.
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Jul 28, 2011
Has anyone got experience connecting a linux machine to a Microsoft VPN server using RSA authentication? What puzzles me perhaps most about this topic is the absolute dirth of information. If it is not possible, can anyone tell me why?
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Sep 1, 2010
I want to know what are the ways to monitorize and control/stop flooding on my server, because I am heavily flooded. At this moment I am doing all this manually (when I see that my bandwidth is lowering or some applications are freezing), my main working tool being iptables.But I want something automated .
Another problem : if I am flooded with packets having real ip addresses , with a simple iptables command I cand resolve the problem easily. But, the problem is, in most of the cases, I am flooded with packets with spoofed ip adresses (e.g. 1.2.3.4 ), so the only thing I can do in this situation is to block all incoming packets (which ruins everything).Do you have a solution to this ? The flood monitorizing (and controlling) tool may be with/without interface, only to be effective.
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Dec 9, 2010
I'm wondering if I can use netcat to listen to a UDP port and display ALL incoming packets, no matter where they're from. If I just do 'nc -u -l 1234' then netcat will listen for incoming packets and connect() to the source address of the first one it sees (I can see this with strace). Is there any (standard) way to stop the connect() call? I can make a hack to block connect() with a function of my own, but that'd be ugly
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Jan 25, 2010
I have an external hard drive that i keep my media on for use with XBMC. The problem is that when media centre is on and i attach the hard drive, Ubuntu's file browser pops up with the contents of my drive and this is over XBMC. When using a remote i am left stuck as i can't alt+tab out of the file browser. How do i disable this?
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Jun 29, 2011
I first booted into Fedora and it connected to the Interneting was working brilliantly. I then booted into windows for a session of TF2. After I booted back into Fedora, it wouldn't connect to my network.I did fix this by doing a hard reset on my router, BT homehub. It's just that I don't want to reset and apply custom settings all the time.
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Aug 13, 2010
Need help, ubuntu keeps connecting and disconnecting to my wireless router. whenever i am able to get it to connect for a significant amount of time, i still have no access to the internet.
using ubuntu 10.04
using Linksys router, not sure what model but can find out.
using toshiba satellite laptop
I am able to access my router and internet in Windows without any problem
dont have anything of importance on ubuntu install, so i could reinstall but would rather not so that i could fix this problem in the future.
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Aug 15, 2010
Im using 10.04 with network manager applet. This is the output i get code...
Why cant ubuntu connect me to a pptp vpn?
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Oct 26, 2010
My IP is being spoofed by someone and I suspect it is being used for malicious purposes(possibly illegal ones). How can I stop someone from using my IP? I'm using a dynamic IP but obtaining a new IP seems to be useless. Changing my wireless password will probably just as useless I guess.
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Feb 19, 2011
I've been reading an interesting article about the fact that ISPs are able to collect net data from web users. What I think It's missing in the article is that in some locations it's compulsory for ISPs to collect and save all your networking data (For example, in Spain, where I live, it's compusory to store people's activity on the net for a period of 6 months (minimum) to 2 years (maximum). In the article they state that Witopia can do the job of encrypting your browsing activity and therefore mantain your privacy. Do you know any open source or, at least, free alternative to Witopia? What do you think about the article and about the ways of safeguarding your privacy?
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May 30, 2011
i have 1 question no more because i got many ddos attack and my load is 95++ what is the best program to stop DDOS Attack ?
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Feb 6, 2010
We are trying to define an appliance based on Suse for an application server and Web server Apache, so we would like to know configuration best practices for network and security, is there any paper/doc about best practices?
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Feb 13, 2010
I was taking a peek at the active connections shown by the Firestarter GUI and noticed the following (the source is my computer):
SourceDestinationPortServiceProgram
192.168.0.11266.235.133.4280HTTP
I closed all Internet related apps and the connection persisted. After a reboot it did not reconnect (yet).The IP address appears to belong to esomniture.com - some sort of web analytics company. How do I prevent my computer from connecting to these rascals. I have found a lot of documentation regarding stopping inbound connections to services on my computer but not the other way. I have various filtering addons installed in Firefox however, this connection seems to be at a lower level as no program is specified as being responsible for the connection.
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Feb 12, 2010
After I've booted my machine I can browse the internet over my wireless network just fine, but when I start Evolution email it prompts for my admin password beforeonnecting to ISPCan I automate / avoid my respnse to this password prompt ?
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Sep 28, 2010
When I installed Ubuntu (Lucid) on my new computer, As well as the login password I was asked for a keyring password. I gave one, but I am not sure exactly why I need this password. It seems that it was required to let me access the wifi - even though this has its own security code. I found I could stop the system asking for it every time I tried to connect to the internet using wifi by checking a button in the network setup, but when I registered for Ubuntu One, I was again asked for it - twice, once when I registered and again when I set up Tomboy notes sync. Now I get asked for it again every time I switch on.
I would like to know why the keyring passwords are needed in addition to the login password for a single user computer, which mine is and also how I can stop it asking for this password when I switch the computer on. One suggestion I have seen is to make the keyring password the same as my login password. If that is the case, then how do I change the keyring password?
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Apr 29, 2011
Does anyone know any common apache 2.2 exploits and how to stop them? I am setting up a web server and want it to be secure as possible. I currently have a basic lamp server on a ubuntu server.
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Mar 15, 2010
I had 2 accounts on a single system. Other users are able to see my data. how to stop other users to access my personal data.
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Mar 13, 2009
I am trying to give access to ONE single user to start and shutdown tomcat server. The problem being, when I enter syntax: username ALL= /etc/init.d/tomcat5, /usr/local/tomcat/webapps, PASSWD:ALL This gives the user access to start and stop tomcat but also gives user access to start and stop other services within /etc/init.d - such as httpd etc... What is the proper way to give user access to start and stop service, and limiting that power to only one service....
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Apr 9, 2010
I installed Ubuntu on an old desktop last night and am having some problems with my wireless connection.I've searched around a bit and tried a few solutions but nothing seems to be working so hopefully someone can help. I'm using a Netgear WG111v3 wireless USB adapter and am attempting to connect to a Sky Broadband modem, the connection shows up in the list of avaliable networks after clicking on the network symbol and after attempting to connect for a while it then asks for the WPA password.
I enter the password and then this repeats over and over again continuously asking for the password and me continuously entering it. I know the password is correct as I'm using it on my laptop and other home computer right now.I've tried connecting to a hidden wireless network and inserting the network name and password as some have suggested and I've also tried adding the details from my router into the connection; so that I have manually entered the information rather than automatically finding it, this also hasn't worked.I should probably add that earlier today I seemingly randomly got connected and then managed to run some updates but since then it has disconnected and the same problem is repeating over and over. Sorry if thats quite a long explanation but I thought I'd try and make it as clear as possible,
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Oct 20, 2010
Ive been running ssh to log into server for long time. Recently a x-win app reported that it suspects a man in the middle attack (MiMA), so I want to tighten this up, but it seems to me if there is a MiM, then the initial key exchange is vulnerable to a substitution. This is on solaris, but since its a basic concept I'm ot getting, it shouldnt matter,
Here's the gist of what I read:
- create users key pair,
- enable host authentication (ssh_config file on client and sshd_config file on remote host)
- start an ssh session and accept the remote hosts key (and I assume the remote host will take client users key and store some where)
Questions:
1. What's to stop the MIM from making a substitution of keys during the initial exchange?? Shouldn't the keys be initially transfered in a more secure fashion??
2. Does the server just accept new keys from any existing user who want to create an ssh session? So if some one knows a username and password (such as the owner of an application they know is running) couldn't they just create their own keypair and have the server accept them?
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Jan 25, 2010
If I enable Wi-Fi on my laptop and use a public Wi-Fi hotspot at an airport, will a firewall such as UFW be enough to stop hackers accessing my personal files which are NOT transmitted over the Wi-Fi connection?
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Jan 4, 2010
I am connecting servers using NFS4 the shared directories are on servers running Debian 4 while the one who read from them is Debian 5.0.3. The problem is one of these shared servers suddenly stop responding and you cannot list it from Debian 5 server, also df hang, and the web application that is using it does not respond to requests that use this shared directory since it is blocked. Then the load on the server start to increase until the server cannot respond (over 90). I have found many entries in the syslog that refer to this like:
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Dec 31 08:16:33 ma25555 kernel: [1200289.815378] INFO: task java:9702 blocked for more than 120 seconds.
Dec 31 08:16:33 ma25555 kernel: [1200289.835249] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
code....
I have tried the connection between the 2 servers using ping for one day and all are OK (zero lost)
There are 3 other servers that are running Debian 4 and are working fine.
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Jul 25, 2011
Because our visitors/customers are short term, and may be configured incorrectly with their own mail servers we automagically redirect all port 25 traffic going to internal IP's to our own mail servers while on our network.(postfix on centos 5.6)While I have taken some measures to prevent it from spamming, I would greatly appreciate some assistance.I will be putting in clamav, but I haven't configured it yet with the mail.I am using postfix, but can also put on procmail or even spam assassin
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Jul 29, 2011
i tried to connecting from a windows7 client to a linux server through vnc server.But its very slow , is there any alternative for vnc . i heard that samba can be used as a remote desktop tool if its true please reply with configuration details.
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Feb 1, 2010
Our mail server keeps on hanging after a while. This happened after there was a breakdown in electricity supply and the server room air conditioners stopped working for almost half a day. We are not sure whether this is a server hardware problem or a coincidence with a break-in attempt or malware activity.
Following are the message from the server log code...
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Jul 22, 2010
I want to connect to my debian server through putty, but only i got is the message - Network error: connection refused. I try with different setting on the server and in putty, but there is no effect.
Here are my settings: for the serveer i use [URL]
Code:
Port 22
# listen address i changed to accept all addresses
ListenAddress 0.0.0.0
[code]....
i have no /etc/ssh/ssh_host_key file and try to comment it but with no success. All other lines at the config file was commented.
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Mar 26, 2011
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Quote:
OpenEMR Setup
Step 3
Configuring OpenEMR...
Connecting to MySQL Server...
i think i have everything installed:
[Code].....
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Nov 12, 2010
how to start and stop jboss server i had done but it is saying permission denied.
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Jan 27, 2011
perhaps anyone can help me. Situation: A VPS Server, i installed a PPTP Server on it, is working. Client connecting to PPTP Server, working. Now i only wanna one port thru the PPTP Connection, all other NOT. In example Port 52000 on Client. Users connecting to Serverip:52000 and should land on Client:52000, BUT and that is what is important for me, with their Real IP. If i do a POSTROUTING ppp0 MASQUERADE it is working, but the Users in my Log have the IP from the Server and not their Realip. It makes sense because i do Masquerading.
Anyone can Help me? That would be great! VPN IPs are 192.168.0.1 on Server and 192.168.0.234 on Client. I can ping each other. Server Interfaces: eth0 and if i connected with PPTP Client ppp0 (192.168.0.1). I wanna not route all traffic through PPTP, only one or two Ports!
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