hm, I extensively tested in the local LAN but "naturally" the results are the same vis internet. I, of course, switched on all options from using DHT, relay server, etc. waited for hours, etc. Even used predefined hosts as well as tried UPnP and manual portforwarding. No success. What strikes me is that it works for certain folder pairs on different computers. Old versions of BTSync recognized the presence of the PCs/Laptop/Server and synced all folders related to this appliance. The "new" version seems to soley think in terms of folders and doesn't seem to share the found connections with other folders which also sync with this appliance/computer. Not sure if this is a bug or by design but I still cannot get it to work the way it is supposed to work. I could imagine this could also be a problem with the new authentification system. Maybe everything works fine in terms of network/connection but the key is wrong/expired/etc and it simply does not show a proper error message. (In case somebody asks: yes, I tried syncing a new folder but neither computer would show any peer = no sync). Any help wouold be highly appreciated