Can't send SOAP request on AWS endpoint

I did tests on old environment (endpoint with wsdl) and I need to re-run same tests on new environment on AWS. I have error “Cannot send the test request” - details:
at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(
at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(”
Any ideas?
I’m using this endpoint on SoupUI and it’s working