My home network uses the 10.10.10.0 subnet. Although it is supposed to be a "Class A" subnet in the original IP V4 addressing scheme, I use it as a "Class C" addresss, with a subnet mask of 255.255.255.0.

I have two Windows PCs, one Gentoo box and a Sharp Zaurus on that LAN, all happily using this setup. The gateway (DSL router) is 10.10.10.1.

When I received the 770 I set it up the same way of course and at first all seemed to be well : it could connect to the web server on the Gentoo box and to the Internet through the router ; later when the vnc client became available it could connect to a vnc server on my XP box just fine.

The strange part came when I installed dropbear on the 770 and tried to connect from Windows with PuTTY : I just got an error message after a timeout period, no connection.
After double-checking the installation on the Nokia I tried connecting with a standard command-line ssh from the Gentoo box, then from the Zaurus : both relayed an error message from dropbear on the 770, something like "no route to host" or "destination unreachable". This led me to ping the 770 from every other machine on the LAN and sure enough, none could. I haven't found a "ping" utility on the 770 so I couldn't test the other way round, but remember, at the same time the Nokia was connecting just fine to those machines through http vnc etc.

At first I suspected a DHCP problem so I rewrote the connexion profile with fixed addresses for the 770, gateway and DNS, with the same result. Then on a hunch I changed the netmask to 255.255.0.0 (a class B address) and surprise, I could now ping the 770 and connect through ssh(*).

I wonder if this is an issue with the 770 TCP/IP stack or default setup, or something truly stupid I'm doing with my own LAN (but that at least four other machines, plus the occasional visiting laptop, have been happily ignoring up to now) ?

(*) though not very well yet, that's in the next post :-)

Did you check if the Connection to the Net was still active ?
I had the same Problems.
The Solution was to play a Internetradio Station.
The Nokia was permanently conneted and i could connect to the Nokia.

I noticed that somtimes the Nokia770 decides to drop the Connection despite the fact that i configured it to permanently stay connected.

You are right, of course, my netmask story is total crap and it was just a coincidence that it worked when I changed it. I put it back and of course 255.255.255.0 works too (phew :-). As I mentioned in another thread a simpler (and less bandwidth-intensive) way to keep the connexion alive from outside is to continuously ping the 770 from a windows console (ping -t ...) or a Linux term (ping -i 4 ...).