Grplscn blocked by firewall

Today, starting GP4 in my Windows “sandbox” partition, the firewall blocked grplscn.
Can someone can tell me what is grplscn? Do I need to authorize it?
Edit: I think it is related to Reaplugs installation and a component called reastream (audio+midi over ethernet).
I do not know if it is safe to install it. At the moment, I refused it.

That application is part of Gig Performer. If you block it, GP won’t be able to validate plugins that require internet access.

Ok, thank you. As I do not use internet on my live partition, I will check if Reaplugs pose problems… but after my next 3 live performances next week.