Mirror remote control command requested access to instance directory not found in registry.

Hi

This  morning I noticed that the ISCAgent.log for one of my high availabilty healthconnect servers has many entries that say:

"Mirror remote control command requested access to instance directory not found in registry."
Requested:d:\intersystems\healthconnect\

In addition, Messages.log has many of the following entries:

ValidateFailoverPartner: Failed: Server at SERVER:2188 (d:\intersystems\healthconnect\) sent /NE/ not /OK/...(repeated 20 times)

As far as I can see, nothing has changed on either server (01 and 02) and the arbiter they use is working correctly.

Any idea?

Andy