RosettaNet conversations cannot be re-started once the timeout (2 hours) has expired. And you can re-start a conversaion mid-way, i.e. resend an acknowledgment.
You have to re-post the initial starting message (RNO) to the TN.
For example, use the pub.client:http service to post an RNO (from the archive folder) to [url]http://localhost:5555/wm.tn/receive[/url] with the appropriate content-header (i.e. content-type application/aplication/x-rosettanet-agent).
#B2B-Integration#Integration-Server-and-ESB#webMethods