This could be tricky to debug, since I don't have access to your network...
Can you try syncing to your laptop from a different laptop inside the same home network? That would help us determine if it's an Android-specific networking issue.
Also try with an empty username and password on both the server and the client, and double check the port number.
Cheers,
> I just installed 2.3.1 yesterday. Firewall is turned off. Still the same problem.
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