Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

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Attempting a connection with kerberos authentication enabled in the server using the following authentication order,

ssh -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex $USER@$HOST -o GSSAPIKeyExchange=yes -o GSSAPIAuthentication=yes,

works as expected.

However, if there is no ticket for $USER in the client, the server throws an error:

monitor_read: unpermitted request 48

And the client gets the connection closed, instead of receiving an authorization error.

As a consequence, setting additional authentication fallbacks, such as PreferredAuthentications=gssapi-with-mic,gssapi-keyex,password results in the methods listed after gssapi-keyex not being tried at all.

See more details in https://github.com/openssh-gsskex/openssh-gsskex/issues/20

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (openssh bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:8375