These two errors are generic connectivity errors and could have many causes such as loss of connectivity to the internet, internet connection timing out due to high network traffic, internet connection interrupted due to a laptop entering sleep/hibernate mode etc...
Basic troubleshooting steps would include:
- Check that the internet connection is still working correctly by browsing to any website with web browser.
- Check that there are no third party security programs blocking access to the Nokia Music Store. The best way is to disable the security software, as a test, to see if the message disappears and functionality is restored.
If the problem persists then it would indicate a high network load for the Nokia Music service. This can be solved by simply trying to download the desired track at a later time.
Contact Nokia Care if this problem isn't resolved by any of the processes detailed above.