If the proxy is using Target Servers, you may encounter the error below:
{
"fault": {
"faultstring": "The Service is temporarily unavailable",
"detail": {
"errorcode": "messaging.adaptors.http.flow.NoActiveTargets"
}
}
}
This issue occurs when the target server configured is either disabled or wrongly configured.
To resolve the fault, the entry should be Enabled or configured properly.
(quite a simple resolution right? but it seems easily missed out)