Errors during copy database from Server1 to Server2?

Hi folks,
I would like to copy database from Server1 to Server2, both of servers are on network. When I get in the "Choose a Destination" step, I type the destination server name or IP address of destination server. I got the errors below:
1) Error source: Microsoft OLE DB Provider for SQL Server
2) Error Decription:[DBNETLIB][ConnectionOpen (Connect().] SQL Server does not exist or access denied
3) Context: Error during initialization of the provider

If you guys met this problems before, please help me out.

Thanks,
Vu