EP to ECC connection

Hi,

We r trying to connect EP to ECC..

When we check the connection Tests, Test Connection through the DQE and SAP Web AS Connection are successfully connected.

But the Test Connection with Connector is failed. It shows following error:-

Connection failed. Make sure user mapping is set correctly and all connection properties are correct.

We checked all the parameters and it's correct.

Pls help us with some tips..

Thanks in advance,

Nikesh Shah.