I have been trying to connect to the android market via my Hero however it keeps saying " Can't establish a reliable data connection to the server" I have tried both wi-fi and mobile interent but no luck. My emails and browser are working fine.
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I had a similar problem. After googling the problem it seems that a factory reset was the most reliable fix.
Tried settings/applications/manage apps/google apps - clear data but the problem persisted.
Factory reset solved the problem straight away, just need to resync contacts calendar etc.
Hope this helps
Yeh I googled this problem too and seems the only solution is to do a factory reset, which I did last night, just make sure all conatcts are backed up to SIM
is well worth it as some of the Apps are def worth it, u will need to resync contacts and some settings but didint take me long