We can install Sock proxy by using below step in Centos
SS5 is a high-performance SOCKS proxy server implementing SOCK4 and SOCKS5 protocols. Below is the step for the installation and configuration of SS5 with user/password authentication on a CentOS 5.x/6.x server.

Step 1) Download the latest source rpm from sourceforge.net

# cd /
# wget http://downloads.sourceforge.net/ss5/ss5-3.8.9-8.src.rpm
run the above command under /. It will download the package for Socks proxy.

Step 2) Build the source rpm

Install below packages using the YUM package manager.
For 32 bit Linux,
# yum install gcc rpm-build openldap-devel pam-devel openssl-devel
For 64 bit Linux,
# yum install gcc.x86_64 rpm-build.x86_64 openldap-devel.x86_64 pam-devel.x86_64 openssl-devel.x86_64

Install libgssapi-devel,
# yum install libgssapi-devel

Now build ss5 source rpm to create the binary rpm package
# rpmbuild –rebuild ss5-3.8.9-8.src.rpm

Step 3) Install SS5 rpm package

# cd /
# rpm -ivh rpmbuild/RPMS/x86_64/ss5-3.8.9-8.x86_64.rpm (for 64 bit Linux)
# rpm -ivh rpmbuild/RPMS/x86_64/ss5-3.8.9-8.i386.rpm (for 32 bit Linux)

Step 4) Run SS5 as root and change the port to 8899 (default port is 1080)

Edit vi /etc/init.d/ss5 and put following lines at the top after shabang(#!/bin/sh):
export SS5_SOCKS_PORT=8899
export SS5_SOCKS_USER=root

You can use any available port you want. Make sure that the port is opened in the buy proxy server.

Step 5) User/password authentication

SS5 configuration file is vi /etc/opt/ss5/ss5.conf. The ‘auth’ directive sets the authentication policy.

For no authentication,
auth 0.0.0.0/0 – –
For user/pass authentication,
auth 0.0.0.0/0 – u

The user/password pairs are stored in vi /etc/opt/ss5/ss5.passwd. Setup permission:
# chown root:root /etc/opt/ss5/ss5.passwd
# chmod 755 /etc/opt/ss5/ss5.passwd
# chmod 755 /etc/opt/ss5

In vi /etc/opt/ss5/ss5.passwd, put user and password separated by a space and one user/password per line.
E.g.
user1 pass1
user2 pass2

Set permission ( /etc/opt/ss5/ss5.conf )
Allow all hosts to connect:
permit u 0.0.0.0/0 – 0.0.0.0/0 – – – – –

Step 6) Start/Stop/Restart ss5

service ss5 start
service ss5 stop
service ss5 restart

The primary benefit of SOCKS5 is the added ability to perform authentication, limiting server access to only those who are allowed. Because of this, it is safer than other proxy servers.

Hackers frequently use a proxy server to conceal illegal networks. In order to artificially boost the duplicated page’s search engine rating, the attacker makes a copy of the targeted website on a proxy server and employs strategies like keyword stuffing and links to the copied page from other websites.