Based on your experience, do you know any reason why IRIS would enter a deadlock/hang state ?
When such thing occurs, it's no more possible to connect to Portal or Studio, despite IRIS service (IRIS.EXE processes) being still active. CPU/memory/network usage are usually very low (eg: it does not occurs because server is overloaded). The only fix is a full restart of IRIS (eg: by clicking on IRIS icon in notification toolbar and choosing appropriate action).
I had that issue on a production server a few weeks ago.


.png)
This project is implemented as a tool for viewing temperature data taken from a temperature sensor installed in Rasperry PI and located in a remote place where there is Internet, for example, in .png)

.png)
.png)
.png)
.jpg)

