Alias for Enterprise Server Broker on IS issue

I am trying to create a ES broker alias on my IS admin page. I have Broker Package installed on the ES and IS machines. However, when I try to create the alias or save it after its creation, I get the message “Exception: null
Create webMethodsB2BClients client group Error” I did check up the ES client group and noticed that there was no client group created called “webMethodsB2BClients”. So, I copied over the client group from my Dev ES box and tried again. However, this time it again came back with the “Exception: null” error. I am setting this up on the Production Box and have a feeling that the IS is not able to communicate to the ES properly.
Has anyone else experienced something like this? Thanks in advance for your replies.