Security is a major concern today, and rightly so. Personal computers today come with a built-in firewall, and multiple security layers protect corporate networks. This keeps unwanted intruders out but it can also cause difficulty for streaming internet applications such as web conferencing, as firewalls identify such traffic and shut it down.
OnSync solves this by using an RTMP connection on standard ports. If this fails, OnSync will re-attempt connection via RTMPT, or http tunnelling. This disguises OnSync’s packets as http packets, by changing their header information to that of standard internet traffic, enabling access through 99% of firewalls.
OnSync’s RTMP packets are not UDP but TCP. This provides higher reliability in varying network scenarios since TCP is a “reliable” protocol, guaranteeing arrival of all data. Additionally, TCP is supported in all networks, UDP is often restricted making it easier to deploy. OnSync will typically connect on ports 1935, 443 and 80, in that order. If the standardised port for RTMP 1935 is not open, OnSync will attempt port 443 and then port 80. These two ports are the standard ports for SSL and website traffic, and therefore almost always open.
For strict corporate firewalls which may apply stateful packet inspection and thus prevent RTMP traffic, OnSync will automatically open a tunnelled connection and wrap its data in HTTP packets to increase the likelihood of a successful connection — our expert technical support staff will work with you to get OnSync up-and-running quickly and smoothly. Please contact us for further information.