Question:
We are currently experiencing connection problems with the PnPScada server.

Answer:
It is likely that the problem lies with you internet service provider and not with the PnPScada server.
Please ping the IP address of the PnPScada server to determine if you can 'see' it. I will also suggest that you do a trace-route.
You can also contact your internet service provider for assistance.
The problem here does at times lie with the interconnectivity between the various service providers.