Are you syncing over the Internet or local network?
If you have disabled UPnP on the router, you will need to open ports 443 and 54321 (port forward) to the IP address of your phone. If UPnP is enabled, you still may want to open the ports to see if that works.
Is the 868L router connected to a regular modem or is it a modem router?
Do you only have issues with Akruto?