ServiceBus client app is not connecting with Service Bus 1.1

We have a Service Bus 1.1 farm (3 servers) installed on our test and production server. When we are trying to create a client app with Service Bus DLL version 2.1.30521 it connects with test environment but fails for production with an error:

 Microsoft.ServiceBus.Messaging.MessagingCommunicationException was unhandled

  HResult=-2146233088
  Message=Identity check failed for outgoing message. The expected DNS identity of the remote endpoint was 'DNS3xxxxx' but the remote endpoint provided DNS claim 'DNSAAA'. If this is a legitimate remote endpoint, you can fix the problem by explicitly specifying DNS identity 'DNSAAA' as the Identity property of EndpointAddress when creating channel proxy. 
  Source=Microsoft.ServiceBus
  IsTransient=true

The certificate contains Subject Alternative Names:

DNSName = DNS1xxxxx

DNSName = DNS2xxxxx

DNSName = DNS3xxxxx

DNSName = DNSAAA

Same way it is configured for test enviornment with subject alternative names as:

DNSName = DNS-TestAAA

DNSName = DNS1-Testxxxxx

DNSName = DNS2-Testxxxxx

DNSName = DNS3-Testxxxxx

Everything works fine when we are using ServiceBus dll version  2.1.30907.0 for both Test and Production farm.

I am sorry if above explanation is not detailed.

Can someone please help on this issue.

Thanks & Regards,

Kunal Abrol