How to Configure Iptables Firewall for 389 Directory Server on CentOS 6.2

389

In this post i will show the ports that need to be by passed in iptables firewall in order to make 389 Directory server accessible and working perfectly. Before the Windows Console (installed 389 Console.msi) from client’ PC connecting to 389 administration server, there are 3 important ports has to opened from iptables firewall. This […]

How to Fix “cannot restore segment prot after reloc: Permission denied” error While Restarting zmcontrol on Zimbra

zimbra

Question : I want to start the Zimbra services. But i am getting the following issue while restarting zmcontrol using “zmcontrol start” command as per below error messages : [zimbra@mail ~]$ zmcontrol start Host mail.bloggerbaru.local Starting zmconfigd…Done. Starting logger…Done. Starting mailbox…Done. Starting antispam…Done. Starting antivirus…Done. Starting snmp…Done. Starting spell…Failed. Starting apache…httpd: Syntax error on line […]

How to Disable iptables on Linux CentOS 5.7 Server

Iptables is used to set up, maintain, and inspect the tables of IPv4 packet filter rules in the Linux kernel. It can run as a host based firewall if properly configured. Iptables places rules into predefined chains (INPUT, OUTPUT and FORWARD) that are checked against any network traffic packets. In certain case, system administrator will […]

How to Install nmap on RHEL 6 Linux Server

rhel

Nmap (“Network Mapper”) is a free and open source tool for network exploration or security auditing. It can help you to find open port on a network. Nmap very useful for system and network administrator to perform system and network administration’s task and sometimes may helps in troubleshooting to narrow down the issue. Nmap uses […]

How to Install, Configure and Use Linux Iptables Firewall on CentOS 6.2

centos6

Iptables is the most popular packet filtering firewall package in linux. It can be used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel. Iptables interfaces to the Linux netfilter module to perform filtering of network packets. In this post, i will show on how to install, […]

How to Install Wireshark on CentOS 6.2

In this post, i will show on how to install Wireshark on CentOS 6.2 server. Wireshark is a free and open-source network packet analyzer that will help to capture network packets and tries to display that packet data as detailed as possible. This post assumed that you have set up local yum repository using your […]

How to Deny ICMP Ping Request on CentOS 6.2

centos6

Ping is a computer network administration utility used to test the reachability of a host on an Internet Protocol (IP) network. Ping operates by sending Internet Control Message Protocol (ICMP) echo request packets to the target host and waiting for an ICMP response. ICMP protocol is used by ping command to check the connectivity between […]

How to Unblock and Reclassify a Website That Trend Micro Blocked ?

Symptoms : I am running Trend Micro OfficeScan and while trying to access a website. Unfortunately one of my site has been blocked by Trend Micro and return the following error message : URL Blocked The URL that you are attempting to access is a potential security risk. Trend Micro OfficeScan has blocked this URL […]

How to Restrict the Access to Specific Web sites Using Squid Proxy Server on CentOS 6.2

centos6

This howto covers the steps necessary to restrict the access to specific web sites using Squid Proxy cache server for CentOS 6.2. Before beginning this steps, please make sure you have properly configured the squid proxy server. If not, please follow this article to install squid proxy server on CentOS 6.2 (How to Install and […]

How to Restrict Web Access By Time Using Squid Proxy Server on CentOS 6.2

centos6

This howto covers the steps necessary to control internet access by time using Squid Proxy cache server for CentOS 6.2. Before beginning this steps, please make sure you have properly configured the squid proxy server. If not, please follow this article to install squid proxy server on CentOS 6.2 (How to Install and Configure Squid […]