Postfix SASL authentication failed

I have two Nethserver insallations on different Locations. The one on location B uses the one of location A as Mailrelayhost. this worked until reacently without any Problem. After a update yesterday I get for each mail trying tobe sent the following messages in my maillog:

postfix/smtp[23960]: warning: SASL authentication failure: GSSAPI Error: Unspecified GSS failure. Minor code may provide more information (No Kerberos credentials available (default cache: KEYRING:persistent:89))

postfix/smtp[23960]: 819F120D538E: to=xxx@xxx.xx,[]:25, delay=1.5, delays=0.45/0.19/0.85/0, dsn=4.7.0, status=deferred (SASL authentication failed; cannot authenticate to server[]: generic failure)

You probably hit this bug:

@filippo_carletti do you know a workaround?

There’s a bug already on file:

See there for a temporary workaround until the bug is fixed.

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Thank you. this helped, its working again

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