Postrouting and IP Masquerading in Linux
IPTables is responsible to handle packet filtering in Linux system. IPTables contains several predefined and/or user-defined tables. Each table contains chains and chain contain packet rules. IPTables...
View ArticleA new WordPress Firewall Plugin
I had written a blog post regarding “How to protect your wordpress blog from web injection” before. I had mentioned a firewall plugin called “WordPress Firewall” which used to be very helpful at the...
View ArticleLinux How To: Install IPTABLES in CentOS 7 / RHEL 7 Replacing FirewallD
CentOS 7 / RHEL 7 doesn’t come with iptables by default. It uses a full functional firewall system called ‘firewalld’. I have been a big fan of iptables and it’s capability from the very first, and...
View ArticleTroubleshooting: Imunify360 database is corrupt. Application cannot run with...
Error Message: # service imunify360 start Starting imunify360: WARNING [+ 3743ms] defence360agent.utils.check_db|DatabaseError detected: database disk image is malformed WARNING [+ 3766ms]...
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Troubleshoot: Server IP address could not be found
I had a client ticket today, with the following screenshot: The error says, ‘server IP address could not be found’. This type of error means there is a DNS resolution error. There could be 3...
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How to: Use WINMTR to Diagnose Network Issues
MTR is a great tool to understand if there is a routing issue. There are many times, customer says the website/web server is slow or not being able to access the network etc. After some basic checks,...
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