Hi there. I'm not sure I understand the problem correctly.
Can you not go to:
Admin menu -> Networking -> Peers
and paste in a new key?
Or, alternatively, on the caller, Admin -> Networking -> Settings , and choose "Delete Key"?
As I said, I'm not sure I understand the problem properly.
Also, is it possible that MDL-15008 is relevant?
Moodle networking (MNet)
RPC auth/mnet/user_authorise:ERROR 0:0: problem again
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