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I have recently started using iptables, and I executed iptables -F without knowledge of what it might do. And suddenly I have lost connection to the node. I can't even ping the node. Any help would be highly appreciated!
Thanks!
You will need physical access to the computer and either restart the firewall script or simply reboot the server (but that's the "rude" way of fixing this).
If this computer is hosted at colocation company you need to either contact their support and ask them to reboot the machine (do not give them your password) or sometimes they have some sort of remote rebooting mechanism. Look through the FAQ of the colocation provider.
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Hi everyone.
I recently purchased a VPS with CentOS 5.3!
However, I want it to run on Ubuntu. How do I convert the system to Ubuntu?
I guess the best you can do is to ask system administrators of the company you purchased your VPS from. They may do it manually and backup data on your VPS you may want to save.
This option also might be accessible on the control panel of you VPS provider.
Reinstalling OS by hand on your VPS may result in a lot of headache and I wouldn't recommend it.
Just install Ubuntu; it doesn't matter what's already installed.
If you have any data on the machine that you care about, back it up first.
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Today I recognized that my tomcat 6.0 has been deployed a strange webapp called jFoler 0.9.
After looking around, I realize that this webapp can upload, download, delete file on the server and computer system also. It also can do some cmd control, so I think it's very dangerous to my company if this happens again.
So how can I protect my server against the hacker?
1 install firewall
2 place tomcat box behind firewall
3 configure firewall to only allow access to port 80 on the tomcat machine to external devices and non admin internal devices.
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One of my servers just had the memory exhausted by a load of Perl scripts, we use plesk and they seem to have appeared under the /var/www/vhosts/domainexample.com/cgi-bin/ directory, I managed to stop all of the processes and delete the scripts but I have absolutely no idea how they would've got there.
Can someone point me in the right direction in order to prevent further attacks?
Who should have access to your webserver machine?
Does this include the owner/operator of domainexample.com?
Do you expect the owner to be placing cgis on your server?
Does domainexample.com need to run cgis?
does domainexample.com need to run perl?
You might want to start researching here:
http://httpd.apache.org/docs/current/misc/security_tips.html
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Sometimes my friend give me root access to his CentOS VPS to help him install some programs and he leaves. Sometimes I mess with it, but I don't have the login information for Parallels Virtuozzo Containers, so can I clean the VPS using SSH?
It's faster than formatting the VPS and re-installing the OS.
You could always take a backup before you being work and revert the changes after the face. rsync is one potential tool you could use to do this.
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i am trying to get the remote access from windows system to linux system using teamviewer but when the connection is established the windows system sees the black screen. so anyone can help me how to establish the fair connection.
I had the same problem - for me with two solutions. On some systems, it just took about 30sec for the screen to build up (in that case, just be patient) and in the other case, there was a driver problem. Try to change the driver to the default ubuntu one and deactivate the proprietary hardware driver in that case.