Finding an issue with Zend Optimizer ?
When you open your webpage, are you getting the message that "Zend Optimizer not installed", when you are pretty sure that it is installed in your server ? You are also sure that nothing has changed in the server and you get this message all of a sudden. "This file...
Unable to upgrade Plesk from 11.5.x ?
When trying to run an upgrade from Plesk panel or via scripts from the back-end, does this process gets halt due to the error given below ? Tpsa-proftpd-1.3.5-6.el5.art.x86_64.rpm | 1.7 MB 00:00 warning: xxxx: Header V3 RSA/SHA1 signature: NOKEY, key ID xxxxxx Fatal...
EasyApache failing to rebuild ? -Part 1
Is EasyApache failing to rebuild Apache/PHP with the following error codes ? ext/pcre/php_pcre.o: In function `pcre_get_compiled_regex': php_pcre.c:(.text+0x31b): undefined reference to `pcre_info' collect2: ld returned 1 exit status make: *** [sapi/cli/php] Error 1...
Virtuozzo – Not able to start/stop a mounted VPS ?
There are many situations in which you may find a VPS in its mounted state. Usually a # vzctl start VEID, would attempt to start the container back. But there are situations in which this task would be hung in the system memory. You may get something an error similar...
Adding mod_proxy_fcgi module to httpd via EasyApache !
mod_proxy_fcgi is the FastCGI support module for mod_proxy. Using the module mod_proxy, Apache can be configured as both a forward and reverse proxy. mod_proxy_fcgi makes this possible via the protocol FastCGI. You can read more about mod_proxy from the official...
How do I train SpamAssassin in a cPanel VPS ?
Getting incoming spam mails to your server can be very annoying, especially if you have already configured many settings to stop the rate of spams. In this post, let us have a look through the SpamAssassin (SA) training which has been found very useful in cutting the...
Redirect the users to a folder within the domain
Suppose you have a folder /home within your domain 'example.com' and would like to have your domain visiting users get redirected to example.com/home when they hit example.com, you can use the following short .htaccess snipnet : <IfModule mod_rewrite.c>...
Finding .lesshts/kthread processes? – Shellshock bug !
Are you seeing weird kthread processes being executed from user's home directory ? For example, if you are on cPanel, are you seeing something like the file /home/user/.lesshts/kthread running and consuming the server resources ? This looks suspicious as a kthread...
Assigning a dedicated IP to a subdomain or an addon domain !
Under normal situations, when you add a sub-domain or an addon domain, it uses the shared IP or the dedicated IP of the main domain. This post will cover on how to use a dedicated IP for an addon domain or even a sub-domain. This can be for a scenario when you require...
Handy tool to monitor file creation in your server !
When you have a live server, there might be situations in which you or your clients would need to have a list of files which have been created. This can be very helpful for example when you have a backdoor to your server and to track and close any vulnerabilities...
Qmail failing to restart !
When trying to restart Qmail are you getting the failure message ? Check for the mailogs to see if you can spot something. If you are on a plesk server, you can find the logs at /usr/local/psa/var/log/maillog Do you find an error like : ================== Date host...
Installing LAMP – Ubuntu 14.04 !
LAMP is a group of open source which is deployed usually to host websites. In LAMP 'L' stands for Linux, the OS which provides the platform, 'A' stands for Apache, the webserver, 'M' stands for MySQL, the database server and 'P' stands for PHP which processes the...
The SSLv3 vulnerability – What do I need to do ? !
It looks like opensource is constantly being hit with vulnerabilities these days ! but yea, as a wise man once said, the more people use and learn on a stuff, the more loopholes you get to find and fix. So the recent vulnerability is with the SSLv3 protocol which has...
Upgrading openssl – for Centos !
With the recent openSSL vulnerabilities, upgrading openssl to a more latest and stable version, openssl-1.0.1g can be done using the following easy steps. Applicable for CentOS server's ! # wget ftp://ftp.openssl.org/source/openssl-1.0.1g.tar.gz # tar -zxf...
How long would httpd service be down when recompiling is done via EasyApache ?
Under normal circumstances, the process involving recompilation of Apache and PHP would take around 15-30 mins. However the httpd service would not stay down for this long. In a usual scenario if things are going well, it would be down for less than a minute. This is...
Should I enable/disable mod_gzip in my server ?
mod_gzip is an external extension module for Apache, which uses Gzip compression method for a significant reduction of the volume of web page content served. Disabling mod_gzip has advantages as well as disadvantages. Among the advantages are that you can save up...
cPanel/WHM – Unable to start PureFtpd !
When trying to run/restart the Pureftp service, do you get the following error ? pure-ftpd (/usr/sbin/pure-ftpd -O clf:/var/log/xferlog –daemonize -A -c50 -B - C8 -D -E -fftp -H -I15 -lextauth:/var/run/ftpd.sock -L2000:8 -m4 -p30000:35000 -s -S21 -U133:022 -u100 -i...
DDoS protection guide – Part 2
We have discussed about DDoS hitting Webservers in this post. It can also attack the DNS servers, which is often called as DNS Amplification Attacks. In Simple words, the attack can be explained as follows : Someone makes an inquiry to you, on how to reach a...
DDoS protection guide – Part 1
What is a DDoS attack ? DDoS, short for Distributed Denial of Service, is a type of DOS attack where multiple compromised systems — which are usually infected with a Trojan (70% of the time)– are used to target a single system causing a Denial of Service (DoS) attack....
Open DNS resolvers and patching them !
Before getting to know what is an open resolver, you need to know what is recursion, ie recursive queries ! Suppose you have a DNS server configured and a local machine which uses your DNS server queries for a website. Imagine this query is a new one and its not in...