confusing error messages for refused transfer

When the server refused the transfer, the following messages are logged:

> 2016-02-04T15:22:10 warning: [ZONENNNN] AXFR, incoming, X.X.X.X@53:
> server responded with SERVFAIL
> 2016-02-04T15:22:10 warning: [ZONENNNN] AXFR, incoming, X.X.X.X@53:
> failed (processing layer error)
> 2016-02-04T15:22:10 warning: [ZONENNNN] AXFR, incoming, remote 'hidden'
> not available
> 2016-02-04T15:22:10 error: [ZONENNNN] AXFR, incoming, failed (no active
> master)

Which is confusing, because 1. server is available, 2. processing layer error can be understood by developers only.