Hope someone can shed some light on behaviour I have noticed - our solution includes plugins that call an external rest web service. It was developed using sandbox plugins on a single full server environment and works fine.
However the live environment consists of multiple servers (2 x frontend in DMZ and 2 x backend inside). The specified ports are opened from DMZ but the sandbox plugins now report a faulted condition on the external web service calls. Only by switching plugins to isolation NONE can the system operate as designed.
The external web service is hosted in the DMZ and uses SSL and is accessible from inside, even via browser on the backend servers.
Any ideas? Many thanks.