SnipIT No 6: Allow HTTP through CentOS firewall

SnipIT is a series of short blogs containing useful information in an easily digestible format. With a fresh install of CentOS, the firewall prevents http and https traffic. To test that it is the firewall preventing access to the web server disable the firewall: sudo systemctl stop firewalld Then try browsing to the servers IP address for a remote machine. […]

Session Initiation Protocol (SIP)

Distributed architecture for creating, modifying and terminating sessions with one or more participants. Controls communications sessions. Standardised under IETF. Covers video conferencing, audio conferencing and one-to-one telephone calls. Stack independent, usually run over TCP or UDP. Uses request/response model similar to HTTP – client sends a request and gets a response from server. Requests/responses in plain text with SIP borrowing […]