ISC Bind as secondary to Windows Server: bad bitmap error on named xfer.

Stoffel, John (TAI) John.Stoffel at
Wed May 12 01:33:27 UTC 2021

Thank you so much for your help!  Your suggestion to use Net::DNS really saved the day, because then I could do a brute force binary search to find the broken DNS record which was screwing me up.  Once I deleted that record, all was well in the world, and my AXFR transfers happened just fine.  

I owe you a beer or two.  Where in the UK are you located?  My mom was from Hudderfield (Go Terriers!!!!) Looks like you're in Cambridge for your email, I think I've got a contact there I could get to draw you a few pints maybe.  

Thanks again,

Sr. Storage Architect
290 Donald Lynch Blvd - Suite 201
Marlborough, MA 01752
508-736-5499 (mobile)
E-Mail:  john.stoffel at
Website: Service Now Self Service Portal

-----Original Message-----
From: Tony Finch <fanf2 at> On Behalf Of Tony Finch
Sent: Tuesday, May 11, 2021 5:24 PM
To: Stoffel, John (TAI) <John.Stoffel at>
Cc: bind-users at
Subject: Re: ISC Bind as secondary to Windows Server: bad bitmap error on named xfer.

Stoffel, John (TAI) <John.Stoffel at> wrote:

> failed while receiving responses: bad bitmap
> None of my googling has given me any hints on what this error could be.

I had to look at the source, which told me it's to do with NXT records which are super obsolete, so I wonder what weird stuff is in the zone that might cause this.

(The NXT record was a predecessor of NSEC; NXT was badly designed so it is unable to support all possible DNS RR types, which is why it needed

$ rg 'bad bitmap'
lib/dns/result.c:137:	"bad bitmap",	     /*%< 94 DNS_R_BADBITMAP */
lib/dns/include/dns/result.h:132:#define DNS_R_BADBITMAP		(ISC_RESULTCLASS_DNS + 94)
lib/dns/rdata/generic/nxt_30.c:154:		return (DNS_R_BADBITMAP);
lib/dns/result.c:137:	"bad bitmap",	     /*%< 94 DNS_R_BADBITMAP */
lib/dns/result.c:278:	"DNS_R_BADBITMAP",

f.anthony.n.finch  <dot at>;!!BiNunAf9XXY-!VH-JqRCMfVb-2Su9Du-D3OA4DlJi6q3lXIg4s9pjD9fwN1atleDmzsKASzloojK1C1WS$
Viking, North Utsire, South Utsire: Southerly or southeasterly 3 to 5 becoming variable 2 to 4, then northerly 5 to 7 later in Viking and northern North Utsire. Moderate or rough in Viking and northern North Utsire, slight or moderate elsewhere. Showers, fog patches. Moderate or good, occasionally very poor.

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