Switching to the second network card may help resolve this. A computer may have multiple Network Identification Cards (NICs).These settings might be absent at all or might look different depending on router model. Some of routers have features that allow to map multicast to unicast or simply block multicast packets. Direct multicast is disabled in router settingsĬheck your router settings.Make sure that your firewall is not blocking UDP packets coming to port 3838. It might be especially the case if peers are on different subnets, VPN. Multicast packets are not allowed in the network.If peers are in the same network and you are trying to connect devices over your LAN, these may be causing the problem: Troubleshooting will be the same as above, with proxy server involved. For that connection to relay server shall be possible for all peers. If direct connection is not possible, Sync will try to establish indirect relayed connection. ![]() Recheck traffic routing rules especially if multiple NIC are involved. It contains a folder that is already syncing. Open Sync's listening port in your router and all possible firewalls in the way. Browser warning Your connection is not private Windows Defender. ![]() Make sure that tunnel is actually possible in your network. Once Sync knows addresses of other peers, it tries to connect to them directly and establish UDP or TCP tunnel on given IP:port IP:port.
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