The log file indicates that your computer currently has the SCCM agent installed. When the OOBSP receives a hello packet from a computer that is already a SCCM client, it will reject the packet.
To initiate provisioning for that computer, make a collection with that one computer in it (a direct member collection is fine). Then, right click the collection, choose "Modify collection settings" and select the Out of Band tab. Enable the checkbox on that page and save the settings. Then, right click the collection and choose "update collection membership" to get the policy generated right away.
Now, your client will get the policy and initiate provisioning. Normally, the policy polling interval is 60 minutes. You could go to the ctrl panel applet on that client system and do the "initiate machine policy retrieval and evaluation" to kick start it.
Let us know how it goes.
Dave