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Google Sync, "Server not responding" or "Invalid Host Address" — solution
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tezro
I tried to sync the contacts from Nokia E71 and Nokia E65. Both using SyncML protocol. 350 entries on E71 and 410 on the other. Both syncing was tried over Wi-Fi at home.

Over and over again I was recieving "Server not responding" or "Invalid Host Address" errors while syncing was being processed. All the given solutions on the web are useless: changing database name from "contacts" to "Contacts" and back, or even changing it to"./Contacts"; switching to server version from 1.2 to 1.1; using login name other than full email address; soft resetting the phone — nothing helps.

The solution was found strangely — I tried to sync over GPRS connection and, voila, everything synced. Looking through the router setup I found that there was no default gateway for devices connected over Wi-Fi and IP assigned using DHCP (all the home devices use static addresses) so that Nokia E65 was not getting the gateway I suppose to get to the Google's side.

I don't really think that's the root of all that "Server not responding" or "Invalid Host Address" problems but looking through the router's setup helped I suppose. Moreover, I turned off "uPnP" if that helps.