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After upgrading Smack from 4.3.4 to Smack 4.4.4, SSO authorization (GSSAPI) broke.
Fix with
https://discourse.igniterealtime.org/t/after-upgrading-smack-sso-authorization-gssapi-is-broke/91156/10
After upgrading Smack from 4.3.4 to Smack 4.4.4, SSO authorization (GSSAPI) broke.