If I remember how to do this.
On the SENDING Server:
You have to create an API Key under CWP Settings -> API Manager
Allow New IP Access
Short Name: Xfer
IP Origin: (IP of new server)
Key Code: (Click on Generate)
Owner: root
Format Request: JSON
Enable Function For: CWP to CWP
Now below, click on every box available, that it didn't check.
Turn OFF the firewall temporarily.
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On the RECEIVING Server:
Turn OFF the firewall temporarily.
Goto User Accounts -> CWP to CWP Migration.
Server IP: (Old Server IP)
User: root
Password: (root password of old server)
SSH Port: (The port # you connect via SSH)
API Key CWP: (API Key generated above)
Maximum simultaneous transfers: (Just leave at 1)
Click on 'Test & Save'
You should see the old server listed under 'Remote Server List'.
Click on the Server IP under and select account to xfer.