SQL azure database can't be connected using windows azure powershell

Hi Team,

We are working on a project that needs to use windows azure power shell to connect to the sql azure database,

but when the power shell command let executes, an error comes out :

New-AzureSqlDatabaseServerContext : A connection was successfully established with the server, but then an error occurred 
during the pre-login handshake. (provider: TCP Provider, error: 0 - The specified network name is no longer available.)

it seems not a program error but an network error, 

we test in another environments, the same errors.

did anyone meet this kind of problem before, 

any feedback will be appreciate , thanks in advance.