Plesk Automation :: Adding Nodes - Installation Task Fails

I am working on a new install of PPA, and after installation on the management node Im trying to add the other nodes. Ive tried to add a Apache, Postfix, DNS & DB node, and they all have the same issue. The installation task fails with the following error:

Destination host 'node.domain.com' (#3), IP '192.168.1.*' : The operation can not be completed because the following component is missing or is not running: pleskd (sc_name '', sc_id #45)

(domain and IP are removed here, correct in the original error. The IP is a backchannel IP, and the public IP was properly set in the management node).

I've verified that pleskd was installed and is running on each node:

Code:

24710 ? S 0:00 /usr/local/pem/sbin/pleskd --props-file /usr/local/pem/etc/pleskd.props --send-signal
24712 ? S 0:00 /usr/local/pem/sbin/pleskd --props-file /usr/local/pem/etc/pleskd.props --send-signal
24714 ? S 0:00 /usr/local/pem/sbin/pleskd --props-file /usr/local/pem/etc/pleskd.props --send-signal
...

I've verified that my management node can connect to the nodes in question via 8532:

Code:
]# telnet 192.168.1.* 8352
Trying 192.168.1.*..
Connected to 192.168.1.*.
Escape character is '^]'.
^]
telnet> quit
Connection closed.

So there shouldn't be any firewall or other networking issues.

What else can I try to get this running?