On Mon, Jun 10, 2024 at 10:06:26PM +1000, Viktor Dukhovni via mailop wrote:

> > Although there are better alternatives to 2 1 1 with Let's Encrypt, some
> > still use 2 1 1, and it seems Exchange Online is not happy when there are 14
> > TLSA records (why 14? because https://letsencrypt.org/certificates/)... A
> > good reason to not use 2 1 1....
> 
> The below includes four of the TLSA records twice, which is indeed
> invalid:
> 
>     e5545e211347241891c554a03934cde9b749664a59d26d615fe58f77990f2d03
>     bd936e72b212ef6f773102c6b77d38f94297322efc25396bc3279422e0c89270
>     8d02536c887482bc34ff54e41d2ba659bf85b341a0a20afadb5813dcfbcf286d
>     276fe8a8c4ec7611565bf9fce6dcace9be320c1b5bea27596b2204071ed04f10
> 
> Each RR should appear exactly once in an RRset.  Perhaps that's the
> problem and not the record count?  Do you still have the below published
> in live DNS?

See https://datatracker.ietf.org/doc/html/rfc4034#section-6.3

Did your zone signing software accept the duplicates?  What are using as
your signing software?

-- 
    Viktor.
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