Could not fetch server info from 127.0.0.1:5255 (Client-specified timeout elapsed). Aborting.

[VanishingPuzzle]

What are the possible reasons for this?

[ongardie]

That message is given by the reconfiguration tool when it can't reach a server at that address. Do you have a server listening on that port on that same IPv4 localhost address? Check the server's logs, and you might try using the netstat tool or similar to verify that it's listening: https://en.wikipedia.org/wiki/Netstat