tls encryption and key changes: symmetric key failed to unwrap

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Hi all,

we have the following situation: An 389ds with tls/ssl configured whith
an certificate from letsencrypt.

Since letsencrypt is short-dated we have an automated update routine for
regenerating the cert8.db.

Now we have this sort of errors in changelog.

[01/Jun/2018:11:46:40 +0200] attrcrypt - attrcrypt_unwrap_key: failed to
unwrap key for cipher AES
[01/Jun/2018:11:46:40 +0200] attrcrypt - attrcrypt_cipher_init:
symmetric key failed to unwrap with the private key; Cert might have
been renewed since the key is wrapped.  To recover the encrypted
contents, keep the wrapped symmetric key value.
[01/Jun/2018:11:46:40 +0200] attrcrypt - attrcrypt_unwrap_key: failed to
unwrap key for cipher 3DES
[01/Jun/2018:11:46:40 +0200] attrcrypt - attrcrypt_cipher_init:
symmetric key failed to unwrap with the private key; Cert might have
been renewed since the key is wrapped.  To recover the encrypted
contents, keep the wrapped symmetric key value.
[01/Jun/2018:11:46:40 +0200] attrcrypt - All prepared ciphers are not
available. Please disable attribute encryption.

I never used attribute encryption and we don't need it at the moment.
But as far as I understand, it's based on the server private key. This
is the one we change every 60 days.

The best idea seems to disable attribute encryption (which doesn't make
much sense if the private key isn't password protected anyway).

Or is there any other way to deal with key changes?

Thanks and regards
Jan
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