knotc refresh -f does not work as expected

Hi,

I have 3 Knot 1.5.3 instances, all hosting a zone, med.sd, whose serial is 2014082105. However, the master has made a mistake and gone back to serial 2011091400. Knot thinks it is ahead of the master, and so will not retransfer this zone at all. I wanted to force Knot to retransfer this zone, and so I did:

knotc refresh -f med.sd

However, Knot just logs:

2014-10-20T13:55:33 info: remote control, received command 'retransfer med.sd.'
2014-10-20T13:55:33 info: [med.sd] AXFR, incoming, 193.0.0.198@53: zone is up-to-date

Despite the request to override checks and retransfer the zone, Knot is failing.