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Please see the following links. 99.99% of the time it’s due to a firewall. I know you said there is no firewall or AV blocking, but there isn’t a ton else that it could be. ‘RPC server is unavailable’ is the message that you would get if you put a non-existent host into the grid. It means that BP isn’t getting a response at all. It could be a DNS issue, but it’s almost always due to a firewall. Please review the following links carefully. Your test of port 135 indicates that it’s probably a firewall issue and that while 135 is allowed, that is not the only port that BP requires, so it seems likely that there is a firewall blocking one/some of the other ports that BP requires. Note, it doesn’t have to be a software firewall or AV running on the target computer. It could also be a network level firewall in between the BP computer and the target computer. The ports link below explains about WMI using dynamic ports.
https://batchpatch.com/troubleshooting-common-errors-in-batchpatch
https://batchpatch.com/batchpatch-troubleshooting-guide
https://batchpatch.com/using-batchpatch-with-windows-firewall
https://batchpatch.com/batchpatch-ports
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