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What ports and protocols are used by Sync?

Sync uses various ports and protocols to function and connect peers. So depending on the network your peers are in, these shall be open and let traffic through on either side:


  • Connecting to relay server to transfer data if direct connection is not possible:
    TCP and UDP, relevant port and addresses are here.
  • Direct connection to transfer data:
    TCP and UDP, listening port as defined in Sync Preferences. 
  • Peer discovery in LAN
    Multicast UDP, over port 3838

  • Automatic port mapping over UPnP and NAT-PMP
    UDP, multicast to port 1900
    UDP, unicast to default gateway port 5351
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