Sync my Sony Ericsson C510 with my google account

Hi guys,

I would greatly appreciate any help with this sync,

then got the error "Google Session failed Communication error."

then tried the following address for the server : https://m.google.com/syncml

then got the error : "Google Session failed Communication error. Check settings."

As far as I know, I've changed my phone settings back so that it would be able to connect to the internet (had a problem with my supplier),

At some point it showed me a message saying that my account name or password are wrong ?!

sincerely :)