Web Server Fingerprinting

Fingerprinting a web server means detecting :

• The daemon provides web server services, such as IIS, Apache, Nginx, and others.
• Its version.
• the operating system of the machine hosting the server.

Netcat is a very popular tool that is also known as the "TCP/IP Swiss army knife"

you can use Netcat as a client to manually send requests to the server

File transfers with Netcat:

• nc –lvp 8080 > receive.txt
• nc -lvp 8080 > /root/Desktop/transfer.txt
• nc 192.168.100.107 8080 < /root/Desktop/transfer.txt

Fingerprinting with Netcat

 nc <target address> 80
 HEAD / HTTP/1.0

Fingerprinting with OpenSSL

openssl s_client-connect target.site:443
HEAD / HTTP/1.0