[knot-dns-users] Standby masters, how to?

Hi, until now I had 3 secondaries running and a hidden primary. This ran perfectly well. Now, I'd like to add some fallback functionality to deal with a potential longer downtime of my hidden primary. Thus I added two more hidden primaries such that now every host (3) has a hidden primary that can serve every secondary at all hosts. But: Only one should be active! Zone and database data will frequently be rsynced to both inactive primaries. If there would be a downtime I will have to start one of the others to continue. According to my understanding of https://www.knot-dns.cz/docs/3.5/html/configuration.html#secondary-slave-zo… I have been in the naive understanding that a configuration like ... remote: - id: primaryMWN # MWN hidden primary (running) address: 10.0.1.203@5333 - id: primaryKBN # KBN hidden primary (not running, standby) address: 10.0.2.203@5333 - id: primaryEDN # EDN hidden primary (not running, standby) address: 10.0.3.203@5333 template: - id: default master: [primaryMWN, primaryKBN, primaryEDN] # queried in that order … would work, because of: "Note that the master option accepts a list of remotes, which are queried for a zone refresh sequentially in the specified order. When the server receives a zone change notification from a listed remote, only that remote is used for a subsequent zone transfer." But I do get error massages like: edn.ellael.lan (ns3) knot[29856]: warning: [ellael.org.] refresh, remote primaryKBN not usable edn.ellael.lan (ns3) knot[29856]: info: [ellael.org.] refresh, remote primaryEDN, address 10.0.3.203@5333, failed (connection reset) edn.ellael.lan (ns3) knot[29856]: warning: [ellael.org.] refresh, remote primaryEDN not usable edn.ellael.lan (ns3) knot[29856]: error: [ellael.org.] refresh, failed (no usable master), next retry at 2026-04-27T19:03:03+0200, expires in 1119353 seconds edn.ellael.lan (ns3) knot[29856]: error: [ellael.org.] zone event 'refresh' failed (no usable master) If I do use "master: primaryMWN" only, everything runs as expected. I must have misunderstood something ... Ok, I will have to modify all remaining secondary's knot.conf files if desaster strikes and another primary has to take over. BTW: I wanted to omit a multi primary setup as mentioned in https://www.knot-dns.cz/docs/3.5/singlehtml/#multi-primary because I do have the feeling that this is some sort of overkill for hosting 5 domains, only ;-) Are there other ways to achieve my goal? ;-) Thanks and regards, Michael