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Try this:

1. Connect ParaView to pvserver (single rank is fine)
2. Create Programmable Source with the following script:

import sys
sys.exit(1)

3. Apply

We're simulating a server crash here. On Apply, the server will exit and you should get the following prompt

However the dialog is not usable! One cannot click on any of the buttons!

Now try this:

1. Connect to pvserver (1 rank).
2. Just Ctrl-C to kill the pvserver processes.

This time the same dialog pops up, but is usable. I can click on it to save state etc.