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High availability sync appears to have stopped working but CARP still fine

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sesquipedality:
As of relatively recently my HA setting has stopped working.  When I try to access "High Availability" -> "Status" I get an error message:

    The backup firewall is not accessible or not configured.

CARP is still working fine, which I why I hadn't noticed and can't say when this begun.  There are no firewall rules preventing traffic on the direct ethernet link between the two firewalls.   Can anyone suggest how I might investigate / fix this?

Thanks

sesquipedality:
Still looking for some help on this.  Even being pointed at where I might find some useful diagnostic logs as to why the link is not operative would be a help.

pmhausen:

--- Quote from: sesquipedality on September 23, 2022, 05:37:58 pm ---There are no firewall rules preventing traffic on the direct ethernet link between the two firewalls.
--- End quote ---
But is there a firewall rule allowing all traffic on the direct ethernet link?

OPNsense like any reasonable firewall is "default deny".

sesquipedality:
Thanks for the suggestion.  Yes, there is.  This is a previously working config that appears to have stopped working at some point.  I did have to reinstall the primary server at one point and did so using the USB stick config transfer method.  No passwords have changed.  The problem is that the diagnostic message I'm getting is so non-specific as to leave me lost as to how to even investigate what's not working.

pmhausen:
IP address and credentials of the secondary as configured on the master are definitely OK?
Web UI on the secondary enabled on the dedicated HA network?

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