Official message
Microsoft original
The RPC server is unavailable.What this means
The client cannot communicate with the RPC service on the target host. The host is usually unreachable, or the related service is not running.
Common causes
- The host is offline, or the address is wrong.
- A firewall is blocking RPC traffic.
Do this first
Check the host address and whether the network can reach it.
What to do next
- 1Ask IT to check the host's services and firewall rules.
Continue diagnosis from this code
Take what you know into the KMS diagnosis. It will ask a few more questions to narrow this down.
Sources
Related articles
About this data
The meaning and the original message come from the documents listed above. The same error code can have more than one cause. This site gives an order of checks. It does not decide your exact situation from the code alone.