Help Center

What is a Relay Server?

By default Sync does its best to establish direct connection between peers to achieve maximum speed. However, if direct connection is not possible due to sophisticated NATs, firewalls, proxy servers, etc. this option will allow Sync to establish connection to Resilio relay server, which will allow to transfer data without direct connection. This will impact the speed at which the files sync though.

To enable the Relay Server option, select the folder preferences and make sure the 'Use Relay Server when required' option is checked. When Sync detects that a Relay server is needed, it will make the appropriate connection with the Relay Server, allowing you to connect to your peers.

When a peer is connected through a relay server, you will see the "Relay server" icon  next to that peer in the Peer list. Files are synced to the relay server and passed over to other peers. Files are always encrypted, relay cannot read them and they are not stored there.

Was the article helpful? Yes / No, send feedback on article Thanks!

Please note that we won't mail you back. This is just purely feedback on the article above. If you need help from our Support Team, please use the "Contact Support" link at the top of the page.