OpenVPN support helped me with this. Below you can find a needed solution.
Below is an example that was just tested in my Cluster with 2 Nodes:
+ Make sure that ""xmlrpc.relay_level" is set to 2 on the Destination Server:
sudo su
cd /usr/local/openvpn_as/scripts
./sacli --key "xmlrpc.relay_level" --value 2 ConfigPut
./sacli start
+ Then run the below command from the Source Node to the Destination Node:
curl -k -X POST -d '<?xml version="1.0"?><methodCall><methodName>RunStart</methodName><params><param><value><string>warm</string></value></param><param><value><nil/></value></param></params></methodCall>' https://openvpn:openpass@12.12.12.12/RPC2/
Where:
Source Node: The Node where you run the command
Destination Node: The Node where you want to apply the command
openvpn = Admin User on Destination Node
openpass = Admin Password on Destination Node
12.12.12.12 = Destination Node Access Server IP
The above command will run "./sacli start" on the Destination Node from the Source Node