How can gemfire locator be configurated to return full DNS name to Client?

we have a locator running front of 2 cache servers,    

Locator.DomainA==>Server1.DomainA, Server2.DomainA.

the problem is when the client(Client.DomainB) try to  access gemfire via locator,  it throws 'get: not connected to GemFire' exception,  the reason is although the Client.DomainB uses full name 'Locator.DomainA' to access gemfire,    the locator itself only maintains hostname of servers,     when the client  executes query,  it do access Server1 or Server2 ,   but in this case,  the networking is not connected.

How can gemfire locator be configurated to return full DNS name to Client?

in gemfire.properties,  locators attribute is full domain name already.

Thanks

Yao