BBS:      TELESC.NET.BR
Assunto:  Import of external Letsencrypt Certificates from NPM+ as pkcs12 contai
De:       Deuc¨
Data:     Wed, 22 Apr 2026 08:28:07 -0700
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https://gitlab.synchro.net/main/sbbs/-/issues/1111#note_8843

So, the root cause here appears to be that you can't import a certificate without a subjectName DN. TLS since 2017 has not, by itself, required a DN and Let's Encrypt, when creating the short-lived for https certs, does not include one.

The TLS cert for Synchronet is used by a fairly large number of "things" though, some of which may actually require a DN... a full audit needs to be done before blindly chopping that requirement out of Cryptlib.
n
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  mSynchronetn  hgVertrauen n hHome of Synchronet n gh[vert/cvs/bbs].synchro.net

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