error:org.apache.http.nohttpresponseexception: the target server failed to respond in SOAP UI

Hi Guy's,

I am getting below error in SOAP UI open source.

"error:org.apache.http.nohttpresponseexception: the target server failed to respond"

and test case execution get stop.

Could you please help me on this?

Note :  we have proxy network in our working environment.

Thanks,

Santosh Dhere.