I suspect this is really a Windows TSIG bug where it doesn't handle
compressed TSIG owner names correctly.  The change resulted in the
workaround for this Windows bug being lost (preventing the TSIG
owner name being compressed).

The following preserves the DNS_NAMEATTR_NOCOMPRESS attribute
when setting case.

Mark

diff --git a/lib/dns/rdataset.c b/lib/dns/rdataset.c
index 5b88f20a98..a168588683 100644
--- a/lib/dns/rdataset.c
+++ b/lib/dns/rdataset.c
@@ -465,6 +465,9 @@ towiresorted(dns_rdataset_t *rdataset, const dns_name_t *owner_name,
        dns_name_copy(owner_name, name, NULL);
        dns_rdataset_getownercase(rdataset, name);
 
+       if ((owner_name->attributes & DNS_NAMEATTR_NOCOMPRESS) != 0)
+               name->attributes |= DNS_NAMEATTR_NOCOMPRESS;
+
        do {
                /*
                 * Copy out the name, type, class, ttl.

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org