How do you get Market to work when Android is unable to access Android Market?

Right now I am using an HTC Hero, having firmware Android 2.1, and I have inserted Vodafone, an India SIM card into this phone, and also having Wi-Fi connectivity. Whenever I try to "sign-in" to Android Market using my Google Account, it always shows > **Can't establish a reliable data connection to the server** > > This could be a temporary problem or your phone may not be provisioned for data services. If it continues, call Customer Care. Now what do I have to do to access "Android Market" from my HTC Hero phone?