Good day,
The problem happens when using the makeCluster function from either parallel or snow packages. I do not see a dialog box appear regarding Windows Firewall. Turning off the firewall doesn't resolve the issue. I originally experienced this issue while using bplapply defined in BiocParallel and was recommended to ask on r-devel mailing list since bplapply utilises makeCluster. CRAN only checks 64-bit computers, so it might not have been checked on a 32-bit computer.
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Dario Strbenac
University of Sydney
Camperdown NSW 2050
Australia