server dns corrupt cache how to clear it

server dns corrupt cache and how to clear it

location: ubuntuforums.com - date: December 4, 2012
Hi Running Ubuntu 12.04 i386 server with Ubuntu-desktop installed (unity-2d). When I ping my domain I do not get my external ip-address as I should. When others externally ping then they do. I would like to know how to Show all the modules options for this server. When It was installed there were a number of options e.g DNS that could be added.Detect determine if a service like DNS / BIND9 Postfix etc is runningStop a serviceRemove a serviceClear the DNS cache Thanks for your time

Server internal error 500 How to find the problem !!!

location: linuxquestions.com - date: September 6, 2011
Hello , i'm facing an error 500 internal error and i don't know where to start .... How can i get information about the error in order to fix it ??? at /var/log/apache2/error.log i can't find anything.... i have virtualmin installed , i searched at /var/log/virtualmin/domainname_error_log but nothing .... where is apache supposed to keep log for 500 errors ????

[SOLVED] If my web server is that restrictive, how can a hacker compromise my system?

location: linuxquestions.com - date: September 28, 2012
Hi, I am making a LAMP web server with only port 80 and 443 (and SSH but not on 22) opened up. I used all the tips that you find when you google "Secure PHP","Secure Apache", I disabled ExecCGI etc.. I changed port for SSH, used fail2ban. I used a program to monitor any change in my /var/www folder. My /var/www folder doesn't have the typical directory names that bots look for. I secured my fstab to tmpfs /dev/shm tmpfs defaults,ro 0 0. In my PHP app, I took all measures against XSS and SQL Injections (using PDO prepared statement for both insertions and selects). File permissions are the right ones. But by only closing all ports except those I mentioned, how can a hacker compromise my system? How could he possibly access critical system files? Thanks a lot in advance

Myhtbuntu Server High iowait issues how to pin point and solve?

location: ubuntuforums.com - date: August 7, 2009
First let me give some details about my mythbuntu-server. Its a Intel E8400 server with 4Gb of memory. It has an 1261ML Areca controller with 10x 500Gb in Raid 6 and 3x 1Tb in Raid 5. The controller also has 2Gb of cache memory onboard. It also has 3 DVB-C capture cards. On normal usage its not having a huge issue (e.g. streaming live tv to two of the mythbuntu clients, or streaming any other types of video). Now when the disks get a bit of an io-load (unpacking a file, copying files from another pc to the server, etc) then there will be iowait spikes. This causes live tv / streaming video to freeze up and actually at times cause the whole server to hang for up to a few seconds. Now I say "a bit of an io-load" because, for example, file transfers dont go above 40-50mb/sec. The Areca controller can handle much more (the main array of 10x 500Gb's can handle 300mb/sec easy and the 3x 1tb array can handle at least 150mb/sec). I already ran vmstat -a 2 10 and it gave

Dedicated server DNS and domain name setup

location: linuxquestions.com - date: December 11, 2011
Hello. I have a dedicated Centos5 64-bit server. Also, I have a domain name which I want to use to access the server using "server.mydomain.com". Currently, the server has apache running, however it is not reachable using any domain name (only by IP). I have set up BIND and configured it using the tutorials I found on the net. If I run `host mydomain.com` on the server it returns the correct IP, however if I run it on my local machine it says "Host xxxx not found: 3(NXDOMAIN)". I called the ISP before and they told me that if I have a domain name (the domain names was not bought at the server provider) I have to set up my server's DNS server to that domain and all will work. Could someone explain me how such a thing can be done because I'm lost? EDIT: If it changes anything, the server has ISPConfig3 running. Thanks! my named.conf Code:

find gateway + DHCP server +DNS server from CLI

location: ubuntuforums.com - date: May 28, 2010
On a remote system, when all you have is the ssh CLI - how do you find out the ip addresses for: the Gatewaythe DHCP serverthe DNS server Don't need to make any changes. Which commands will display this info?

Ubuntu Server, Precise 12.04 How to admin? I am very confused.

location: ubuntuforums.com - date: May 26, 2012
I humbly ask you to post only if you know exactly what is about and you have experienced on your own skin. (Example: I have received some advices in the past regarding boot-splash manager which broken the system up. They where good but maybe for another ubuntu version) This is what I did in general Hello! I've managed to install Ubuntu server 12.04 Precise into a laptop which is a Toshiba Tecra 8200 Pentium III @ 877 or 900 Mhz 256 SDRAM 74 Gb Hdd I am working with my tiny box with ssh (I have changed the port to another number like 61980), and putty but I have also installed grafical interface. At the command free -m was showing that it is using only ~89 Mb right after I finished the install, but in time I added more software/other stuff with Code: sudo tasksel like xubuntu desktop, lubuntu desktop, ubuntu desktop, lamp server, znc, and other little goodies as "fortune-mod, mc etc." Now the problem is that is using more ram ~203 mb, and I

Possible Comprimise: Ubuntu server 12.0.4: How do I know? How to clean?

location: ubuntuforums.com - date: October 30, 2013
**12.04.3 LTS Yesterday I went to login to my Ubuntu Server running on a Dell Poweredge, after being unable to login via ssh I posted a question http://unix.stackexchange.com/questi...several-months and today I hooked up a monitor and keyboard to attempt to login locally and ended up needing to run Code: passwd . Now that I have access I started looking at the log files and didn't see anything in my cursory overview that looked too odd, but then I installed rkhunter and chkrootkit each have odd results. chrootkit finds a java directory with java 6.0 - This is odd because this server has no need for java and I did not install it. rkhunter is running right now and I am going to post some of the output: Code: Checking the network... Performing checks on the network ports Checking for backdoor ports [ None found ] Checking for hidden ports [ Skipped ] Performing checks on the network interfaces Checkin

Server randomly becomes unresponsive how to find fault?

location: ubuntuforums.com - date: January 5, 2014
For the last week my dedicated Ubuntu LAMP server has randomly become unresponsive when accessed remotely such as trying to connect to the website it hosts. Each time it happens it goes down for approx 30 mins and then comes back to life, however i can reboot the server or restart the Apache service and it comes back to life instantly It happened today and i noticed i couldn't access the server from the external website address & the mail client wasn't working either, however when using internal ip addresses to connect i could access webmin, ispconfig, FTP & Telnet without any issues So from what i can gather its a fault stopping external connections. I've ran the HP diagnostics which has no hardware faults in the logs and i've ran hardware diagnostics which have come back ok I've checked the main logs and cant find anything, the only thing i've noticed is some these 'No host group' errors in the logwatch report (the server had just been rebooted): Code: Banned serv

Setting up a local server (ddwrt) to cache ubuntu deb files

location: ubuntuforums.com - date: March 22, 2014
I am wondering if i can put a flash drive in my dd-wrt router and have it use that to cache the archives i would download to /var/cache/apt/archives i know there is a package for this in the Ubuntu repos, though i have never used it. i commonly test installs on different HDDs on my desktop, sometimes in virtualbox i figure i can speed it up a bit and save bandwidth by having the files locally stored at my router Code: [email protected]:~# cat /proc/cpuinfo system type : Atheros AR7242 rev 1.1 (0x1101) processor : 0 cpu model : MIPS 24Kc V7.4 BogoMIPS : 265.42 CPUClock : 400 wait instruction : yes microsecond timers : yes tlb_entries : 16 extra interrupt vector : yes hardware watchpoint : yes, count: 4, address/irw mask: [0x0000, 0x0c08, 0x0b30, 0x0778] isa : mips1 mips2 mips32r1 mips32r2 ASEs implemented : mips16 shadow register sets : 1 kscratch registers : 0 core : 0 VCED exceptions : not ava