The domain already exists in the apache config file

Unable to add addon domain in cPanel getting the error as “The domain already exists in the apache config file”

Solution: Please remove the domain entries from below files manually from server.

/scripts/killdns domain.com

grep domain.com /etc/localdomains

grep domain.com /etc/userdomains

grep domain.com /etc/trueuserdomains

vi /var/cpanel/userdata/cpanelusername/main

grep domain.com /var/cpanel/userdata/cpanelusername/main.cache

grep domain.com /var/cpanel/users/cpanelusername

vi /var/cpanel/userdata/cPanelusername/main.cache

grep domain.com /etc/named.conf

vi /etc/localdomains //remove the domain entry

vi /etc/userdomains

grep domain.com /etc/trueuserowners

grep domain.com /var/cpanel/userdata/cPanelusername/main

Unable to login to joomla admin panel

After doing lot of research one of the solution which I found has worked for me and I would like to share the same with people in need. 

Check if upload_tmp_dir path is configured in php.ini. You can check by creating phpinfo.php file and add the below code in the phpinfo.php<?phpphpinfo();?>Then access the file as domain.com/phpinfo.phpIf it is not mentioned then open the configuration.php file of joomla, check which path is mentioned in "public $tmp_path" and add the same path in php.ini file. If php.ini file is not present then create one in /home/user/public_html/

Bot consuming high bandwidth and memory

Bad bots may be from google bot or any other bad bots. To reduce the same first you need to find which bot is affecting the bandwidth and memory. 

Find the log from below command: 
sudo grep "05/Nov/2015:0[1-2]" /usr/local/apache/domlogs/ulifeqxj/ulifephoto.com | grep -i "googlebot" | wc -l
sudo grep "05/Nov/2015:0[1-2]" /usr/local/apache/domlogs/ulifeqxj/ulifephoto.com | grep -i "bot" | wc -l

Once you found which bot is causing the issue, you can block it by adding rule in .htaccess. 

Htaccess rule for bad bots: 
http://pastebin.com/n0pShLsX

Follow the steps of below link to reduce google bots: 
https://support.google.com/webmasters/answer/48620?hl=en

Icon Images are missing in website

Problem :
While browsing the domain showing the webpage with icon missing. It is working fine with primary domain link. Ex: domain.com/domainfolder

Solution: 
Check the config.php file for any wrong update of home URL. Change it to domain name. This will fix the issue. 

Unable to install plugin in wordpress dashboard

While installing the plugin getting the below error:
+++++++++++++++++++
Could not create directory.
+++++++++++++++++++

Solution: Check if the plugins folder is present in /public_html/wp-content/

MP4 video is not playing - IIS/Plesk

You have to add the MIME Type to resolve this issue. You can add the MIME type in Virtual Directories > MIME Types or in web.config file. 
For Web.Config file you need to add below section in configuration.
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
  <system.webServer>
    <staticContent>
        <mimeMap fileExtension=".mp4" mimeType="video/mp4" />
    </staticContent>
  </system.webServer>
</configuration>

Checking log for hacked site

Hacked info will be present in the domlog. Get the path of the domlog for the domain from httpd.conf file.

sudo grep user /usr/local/apache/conf/httpd.conf

Grepping the hacked log :

sudo grep domain.com /usr/local/apache/domlogs/domain.com | grep 03/Jun/2016 | grep POST

Grepping the IPs:

sudo grep domain.com /usr/local/apache/domlogs/domain.com | grep 03/Jun/2016 | grep POST | awk '{print $1}' | cut -d: -f1 | sort | uniq -c | sort -n

You can check the location of the IP by going to http://www.ipligence.com/iplocation

You can block the IP by going to cPanel > IP deny manager