If the Storage Connector uses an outbound proxy, you should monitor its connectivity. A TCP Keepalive connection should be generated every 30 seconds. If a connection fails, there should be up to 3 sequential connections with 5 second intervals. If they fail, you should consider the proxy service as down.
The following settings are located in the /etc/syncp-storage/syncp-storage.conf file under the proxy section.
proxy { enable: false host: "10.10.1.1" port: 3128 }