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docs: note dns_canonicalize_hostname=false may be needed - #3
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The redeem->negotiate pipeline now completes end to end but the target rejects the ticket with 401: GSSAPI canonicalizes the connected host via a reverse DNS lookup before building the AP-REQ's service principal name, and os-search-atlas-physics-dev.cern.ch's own TLS certificate shows a different canonical name (CN=oscqa301.cern.ch) for the same host -- the SPN curl builds from that canonical name doesn't match what the server's keytab was issued for, so Apache's mod_auth_gssapi rejects an otherwise- valid ticket. Same class of DNS-canonicalization issue as maniaclab/krb5-token-service#3, applied here to curl's GSSAPI layer rather than kinit's KDC contact. Both rdns and dns_canonicalize_hostname are set for compatibility across krb5 library versions. Assisted-by: Claude (Anthropic)
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Confirmed necessary at UChicago's AF while investigating why cern-get-keytab (used by /v1/keytab) hangs/times out from that cluster — unrelated to the DNS setting itself, but found in the same pass, so documenting it here as a standalone fix. Companion PR: maniaclab/af-mcp-platform#278.
Documentation only — no code or default config changed.