Deal is not moving into queue in Dynamics AX EP

Hi,

I've submitted a deal in EP successfully, but it is not moving into queue.

The error i receive on EP side is "Workflow stopped".

The error i receive on AX side is pasted below. I'm using proper service accounts and i've chechked in "System service accounts", App Pools, AX users, Sharepoint Users, everywhere the account is same and is a valid account. Not sure why i'm getting the below error as "failed to logon". Request for someone's help at the earliest.

Workflow Instance ID: 005381 mscorlib Failed to logon to Microsoft Dynamics AX.

Server stack trace:

at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)

at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout).

Regards

Dheeraj